Harley Shovelhead Backfires Through Carb

There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc. my personal experience is yes you would be ahead to enrichen your main jet if fuel injected get it mapped , if carb, dont spend $40. When I first bought the bike, it had a Vance and Hines exhaust on it. Shovelhead Cylinder Not Firing. If the motor responds with a gratifying blast without backfiring through the carburetor, you have your idle mixture right. Install the Mikuni spring and plunger onto the Harley choke cable. Each of these pieces is made of a hardened metal that are finally ground to create the seal. When in doubt consult your factory service manual and/or a professional motorcycle technician. I have a 98 Harley Heritage Custom with the 80CI EVO. When I shut the key off and restarted it would idle normally for a short time then creep back up during riding. Not only that, but we have them all in-stock and ready to ship to you today. roundslide and flatslide. S&S e carb by the way completely set for primary tuning. Another shovelhead problem already Fuck me and everything I stand for, I'm just getting the absolute shit end of the stick. These signs include a drastic decrease in fuel economy,. Also, since there is no spark advance cable, what is holding the timer in full advance?. The other spark is "wasted" in the intake or exhaust stroke of the other cylinder. Blip the throttle a time or two and observe the results. ) The first successful turbo for the Harley big twin was this design which featured an IHI Turbo, an SU CV Carb, equal length primary tubes joining into a 2-1 turbo header; a 2 1/2" turbo. Remove the Harley choke cable from the stock carb. The idle circuit provides fuel to the carb when there is no throttle engaged. 6) Caused by installer allowing engine to spit-back up through carb. Make sure your hotwire to the coil is making a good connection. Turning this screw clockwise will rich the mixture and worsen the bog. I've already fouled the plugs by running too long with the enrichner, but the backfires and stumbling are killing me. 76 Kuryakyn Carburetor Support Bracket For Harley Touring 2008-2017 $26. The low speed jets in the carburetor are too lean. For gas prices to hit $3, crude would need to go to about $100 a barrel, well above even the highest pro-jections this year of $70 to $75, said Tom Kloza, pub-lisher and chief oil analyst at Oil Price Information service. Problem CONDITION POSSIBLE CAUSE CORRECTION 5) Ford& Holley Only. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. I did a complete frame off suspension rebuild this last fall. It was developed from the broadly similar and highly desirable K-series sidevalves (1952-1956). Save Share. I rebuilt the "Backfiring" is a pretty broad term depending on where you live. Founded in 1993 by brothers Tom and David Gardner, The Motley Fool helps millions of people attain financial freedom through our website, podcasts, books, newspaper column, radio show, and premium. Eventually had to go to 195 main/50 pilot (OEM is 190/45) & raise the OEM needle 0. It also is the way to stop "carb farts" - spitting back or backfiring through the carb. Revving the engine in neutral will result in RPM dip below idle RPM, RPM's will drop quickly. •Always use an insulator block between carb and manifold. 2 Spark Plungs. If your Ironhead has aftermarket free-flow exhaust and airfilter on it, it will almost certainly need a larger low speed fixed jet, and most likely a bigger main jet too. Keith Black. Something loose? I took it to both of the Harley Dealers in my area and the first told me it was the jets and charged me $500 but that did not work, then I took it to the second and they rebuilt. Spark firing occurs only on the compression stroke. Blip the throttle a time or two and observe the results. Eventually it explodes in the exhaust. I have seen more than one motorcycle backfire through the carb because of that--- one was a '46 knuck that burned to the ground at a gas station. Bike started fine but died after a few seconds. The KRTT, XR750 and XLR ran Tillotson carbs (single and dual) for all their race engines. I used to stop to set points, adjust a carb, check a leak, or wander down the side of the road looking for a chain that jumped into the weeds an’ hid, but now, I stop to work out the kinks that always develop in places I didn’t know I had 20 years ago, and take a leak… yeah, I do believe that I was a Shovelhead in a past life, an’ it. Jet needle - This is a carb part that meters the fuel going through a jet, or hole. Keith Black. When you fire the bike up it runs rough and it dies out. All his jets are on back order. This design, combined with the V arrangement of the cylinders, means that the pistons cannot fire at even intervals. Coughing through carb when key turned to light position (1 2) anything2wheels on 06-23-2019. Rough idle until it is really hot it backfires out of carb. Deceleration backfire results from a chain of events that begins with reduced pressure in the cylinders. go step by step through power drill- start with carb or ignition, then valve adjustement. A solo seat and lowered suspension puts the rider just 25. If the motor responds with a gratifying blast without backfiring through the carburetor, you have your idle mixture right. Looking through the posts on this thread - I was able to buy an internal spring compressor through O'Reilly's that has hooks on the bottom that grasp the spring and a jam nut on the top that goes through the top shock mount hole. Then suddenly, my friend informed me that his harley just acting up and it backfiring and popping. If you put another carburetor on other than a Linkert, then the problem ratio is increased. The float-type carb has a float-operated needle valve that keeps the fuel level a constant distance below the edge of the discharge. ↳ Shovelhead ↳ The Gallery ↳ Indians & other non-Harley models ↳ Indians. Stick it in the port. It is important that these mixtures are distributed evenly, otherwise the engine will not work as efficiently. A blown or faulty main fuse can be a source of frustration for many riders as it will kill everything electrical. I go on rides anywhere from 100 to 300 miles a day. Press the gas pedal to troubleshoot your golf cart engine. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. ” The Shovelhead motor stays in production relatively unchanged for 20 years. Running rich like that could be the small air tubes that feed the two jet mix tubes are blocked, which really randomizes the amount of fuel coming through both the idle and main systems. ) His advised to add some Ultra Copper to the gaskets. If the engine backfires or breaks up in the carb, increase the main jet size. Critical! Be sure for initial carburetor set up all air by-pass screws should be in closed position. Development Services Di- rior were taken by a county rector Gary Maidhof said the code inspector from a sher-building is a barn as defined iff's boat in the Withla-by state law. Bike began to idle really fast. Make sure your hotwire to the coil is making a good connection. Perhaps the only part of a motorcycle that is taken for granted more than tires are the spark plugs. More than a motorcycle part store, BikeBandit. Normally, the mixture screw should only require 2 to 3 turns. Everytime I get it started it pops really bad out of the carb and I can see flames through the throttle plate and its idleing kind of high when it does idle. Buy and trade gear, speak your mind, ask a question, or attract other AMCA members in your area to nearby antique motorcycle events by getting the word out. This will put vacuum in the carburetor, and thus prime the cylinder(s) with fuel. Harley-Davidson had this model as standard equipment on Sportsters and Big Twins in 1967-1971. Bottom line: we'd need more info to troubleshoot it from here, but the primary problem is a fuel problem, not a fire (AKA: ignition) problem, from. Why Does My Carburetor Backfire? a loud sound, like a gunshot, and occasionally is accompanied by a visible flame. (one bolt) I am trying to rule out some other things also. It is important to understand how oil from the engine could reach the exhaust pipe, as well as whether the liquid you are observing is actually engine oil or something else. took the carb off gave it a good clean checked the float and everything in the carb checked, checked the filter in the tank, checked the gas pipe clear. Pretty much my experience with HD carburetors. The Harley-Davidson engine oiling systems needs 700 RPMs or greater to deliver proper lubrication. Outside Temp was about 92 degrees. Which usually doesn't happen. So recently the starter solenoid, and the relay was changed. I'm trying to tweak my S&S Super E carb and I'm still getting a few backfires through the carb, which doesn't help in trying to sell it. DCOE Adjustment controls Tuning & Adjustment. If it backfires through the carburetor, back the idle mixture screw out another 1/4 turn. 2005 roadglide bike is fully detailed 95 " J PRECISION heads ,wiseco pistons, screamin eagle cams,large bore CV carb,thunder heart ignition,vanse and hines true duals with big ovals. check owners manual for tuneup details and maintenance. (muffler, bladder or backplate. If the motor responds with a gratifying blast without backfiring through the carburetor, the idle mixture is correct. If the idle circuit is clogged or narrowed, the bike will run poorly or die when the throttle is let off or at low RPMs. 80ci Shovelhead Motor. I have a 1994 Harley Davidson, with 80K miles, that is backfiring under throttle. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). The most common culprit is usually something wrong with the ignition system. I'm about 2 - 3 turns counter clockwise from the stop on the enricher screw, and I've got the idle set to 1000 rpm. Eventually it explodes in the exhaust. This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. This 2-stroke beauty came our way through one of Jarred's friends, needing some love, and a few repairs…. When I shut the key off and restarted it would idle normally for a short time then creep back up during riding. Why does my engine spit or backfire? When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. Carburetor Related - Find discussions on carburetor related goodies here. Find many great new & used options and get the best deals for Ultima Single Fire Programable Ignition Kit DYNA 2000i Chopper EVO S&S at the best online prices at eBay! Free delivery for many products!. About 30 minutes total riding time with 2 quick. 1970 cb350 carb issue, one exhaust cooler. For the newbie: a dual fire system was Harley's choice for about 100 years. All his jets are on back order. If the engine backfires or breaks up in the carb, increase the main jet size. If backfiring occurs by way of the carburetor then adjust the idle combination screw out another one/8 turn. Some people refer to backfiring as popping from the exhaust while others refer to it as the engine spitting through the carburetor. You'll find a small hose running from the very bottom of each carb. Its a beautiful spring day in the northeast and I am doing some spring bike cleaning. Possibly damaged by a backfire condition. This is a very good example of a shovelhead lowrider. At the throat, an HS6. We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". The single fire ignition uses separate coil windings and electronics to fire each spark plug independently. Frequently Asked Questions With Answers. 11 inch rear shocks , straight out slash cuts , forwards , s&s E carb etc Good reliable electric start & kick vintage bike. If you don't have one you can get one by attending-a FAA 16 hour t raining course. Engine backfires can be produced by a vacuum leak, bad timing, problems in the ignition system, a faulty sensor, an exhaust leak, or some other system fault. Symptoms of Bad or Failing Points & Condenser If your vehicle runs rough, the engine will not fire, or the vehicle will not start at all, the points and condenser system may be failing. Remove the Harley spring and plunger from the Harley. Remove the Harley choke cable from the stock carb. it needs a new battery and a timing adjustment, backfires when giving it some throttle. through May,. With a wide range of products for your Harley® you are sure to find the right fit for your motorcycle. If you do it on a car, it will empty the carburetor and it will take a while to fill it to start. Since you've modified it, now you do. A new piston and fresh rings will work wonders!!!!. 95% harley parts ranging from 1948 to 1997, very few new/old stock parts. A CV carburetor (Constant Velocity) incorporates a vacuum operated slide that varies the venturi size within the carburetor, thus maintaining a constant velocity. I have set the point gap at 0. best top 10 manifold motorcycle list and get free shipping. definition of - senses, usage, synonyms, thesaurus. The bike looks fantastic, but it seems to have a few undisclosed issues, bad vibration in first gear, terrible road wandering, and wobble under braking, and serious carburation problems, to the point where it stopped with a loud gunshot backfire, and then refused to. Still many analysts, in-cluding Kloza, have been surprised by the run-up in gasoline. Outside Temp was about 92 degrees. Press the gas pedal to troubleshoot your golf cart engine. 1 Fuel Filter. With an impact or socket wrench just turn the threaded rod and the springs compress nicely in the shock towers. Swap and trades? Harley Davidson Forums > Harley Davidson Tech & Mechanical Forum > Carburetor Related. ) The first successful turbo for the Harley big twin was this design which featured an IHI Turbo, an SU CV Carb, equal length primary tubes joining into a 2-1 turbo header; a 2 1/2" turbo. Made by Dynatek as an equivalent to the Dynatek 2KI for Ultima. The bike looks fantastic, but it seems to have a few undisclosed issues, bad vibration in first gear, terrible road wandering, and wobble under braking, and serious carburation problems, to the point where it stopped with a loud gunshot backfire, and then refused to. stopped for gas one day bike would not start, there was a clicking coming from the relay. The small engine condenser stores a high voltage charge. any reference related to "harley davidson" or any harley davidson models is solely for identification purposes and is not intended to create any confusion or deception in the marketplace. 2018 Harley-Davidson Softail Slim. This high resistance causes a very high amount of voltage to be generated from your ignition coil's secondary. All Twin Cam & fuel injected Evolution engines are fitted with single fire ignitions. It is still rideable but sometimes when it happens it is always at the wrong time. It idled pretty good, and ran cheetah strong, with some backfiring. The Beast runs fine otherwise. Bike is not running right. How a Thunderheader™ exhaust system will affect your engine's performance depends on other modifications that are made. Carburetor Related - Find discussions on carburetor related goodies here. I am not sure if the stuff to remount the carb comes with the carb rebuild kit, so a call to the tech service bunch at your supplier (J&P or where ever) to ask them about that. I go on rides anywhere from 100 to 300 miles a day. Runs fine over 50 mph. If you're not sure if your carburetor is equipped with a pump, or to see if it is working properly you can do the following: Remove the air filter enough so that you can see into the throat of the. Check the cable for free-play after installation. I have a 46 pilot and will try a 48 pilot next as soon as Tattoo can get one. After buying a 2000 Dyna Wide Glide a year ago for half price from an unemployed friend who was moving in a hurry, I started to work on the low speed (and dangerous) carb cough. cv carb on my 75 shovelhead. Motorcycle Spark Plugs. Vehicle History Report contains information about accident, odometer rollback, salvaged, stolen, illegally modified, owners and more. (muffler, bladder or backplate. Something loose? I took it to both of the Harley Dealers in my area and the first told me it was the jets and charged me $500 but that did not work, then I took it to the second and they rebuilt. Nothing outragous but just one time it will barely be idling high enoug to keep running and then the next time I ride will be idling a bit high. ·Forums > Harley-Davidson Sportster: Carb poppingthrough the carb canis not a Sportster thing to backfire through the Carb although they. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some - 1999-2005 Pontiac Grand Am. If the engine is flat or will not accelerate, decrease the main jet by. Black smoke/flames out of tailpipes Ideas???. Harley Shovelhead gas-tank emblems were the same from 1966 through 1976. Also when cold above 3/8-1/2 throttle it would would run smoother, would only pop every once and a while. Get free shipping, 4% cashback and 10% off select brands with a Gold Club membership, plus free everyday tech support on aftermarket Shovelhead Vintage Harley-Davidson Carburetor & motorcycle parts. best top 10 multi driver brands and get free shipping. Twin Cam: 1. Positive crankcase ventilation (PCV) systems— first used in the 1960s and present on most modern engines— send the crankcase gases back to the combustion chamber, in order. Sounds like something I will have to try. Click Here For Dealer Only Access to Tuning Maps! Thunderheader™ high-performance exhaust systems, are specifically designed for the HARLEY-DAVIDSON V-Twin engine. I'm thinking of trying it because some of the boys on the shovelhead forum recommend it with the CV carb. The graphic below shows what occurs. 3 inches above the pavement. I still have a 1983 Harley FLT that has over 300,000 miles on it although the Shovelhead engine was replace many years ago. Air should pass without much difficulty, otherwise replace the filter. Keith Black. It starts easy, idles well, but when I try to go I get crazy backfires on acceleration. Looking through the posts on this thread - I was able to buy an internal spring compressor through O'Reilly's that has hooks on the bottom that grasp the spring and a jam nut on the top that goes through the top shock mount hole. 1 Choke Cable. Use 64panhead's sequence, EXCEPT be sure to turn the choke OFF before kicking it with the ignition ON. All carbureted Evolution engines are dual. I do have a used 50 pilot that was in my old Keihin butterfly carb. Made by Dynatek as an equivalent to the Dynatek 2KI for Ultima. Note: Although several cam grinds were used in stock engines from 1999-'06, the timing specs of the 475G cams is most similar to cams used in 1999-'03 EFI engines. then i removed. Blip the throttle a time or two, and observe the results. i hate to see it go but never ride any more and the tax man wants my money. Eventually it explodes in the exhaust. Other causes of backfire are bad or weak fuel pumps, low fuel pressure and clogged fuel filters. There is no denying that a Harley-Davidson motorcycle has a unique sound, especially if the mufflers have been removed! Even with the mufflers on, however, it sounds different from other motorcycles. Runs, has backfiring issue. As soon as the revs slow down the pressure in the pipe drips and air gets sucked in through the hole. The intake manifold is attached to the top of the engine by the intake manifold gasket, which has to be monitored as it is susceptible to cracking under the heat and pressure and allowing coolant or oil to escape. We carry the latest models from Arctic Cat, Yamaha, Suzuki, and other brands, and also offer rentals, service, and financing near the areas of Bible Hill, Murray Siding, Cental Onslow and Upper Brookside. What does constant velocity mean. Changed intake O ring gaskets, still pops and misses at slower speeds. Intake manifold gaskets can be made of paper, rubber, metal, and sometimes a combination of the three. I'm tired of working on this beast for now. Early 1980's Models: Shelby Sawyer (the good looking one), and Brett Clark (credits: Hunter, Star Trek Wrath of Khan etc. Ignition Timing Explained/Timing an Unknown Engine As they move out, they rotate the upper part of the shaft which passes through the plate that the points are bolted to so that the rubbing block which opens the points meets the lobes which hit it (and thus open the points) a little earlier. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. The carburetor must be clean, as fuel cannot flow properly through a dirty carburetor. Jet - Precisely drilled opening in the carburetor through which fuel passes into the air stream. Cars & Motorcycles. If you do it on a car, it will empty the carburetor and it will take a while to fill it to start. If it's backfiring outta the carb, it's generally a fuel problem. So today I bought myself an 1981 AMF 1340 Shovelhead, that red one above, and the damn thing broke down on my ride home! arghhhh. Although the techniques for kick-starting an old motorcycle are basically the same, every bike is a little different - even the same makes and models can be slightly different. Generally, a backfire is caused by an imbalance in the air to fuel ratio. Electric current passes through it and establishes a magnetic field. Hannans machine shop in hayward did the work. Remove the Harley choke cable from the stock carb. It's cold here today, which doesn't seem to help either. It's cold here today, which doesn't seem to help either. Using the same base engine, displacement was increased to 1340cc (80 cubic. Blow through the filter in the direction of fuel flow. Troubleshooting A Crankcase Breather That Is Blowing Oil If your crankcase breather is passing oil, chances are that something's wrong (Okay, we know something's wrong, but don't be too alarmed). It just started doing this today. These signs include a drastic decrease in fuel economy,. I am not sure if the stuff to remount the carb comes with the carb rebuild kit, so a call to the tech service bunch at your supplier (J&P or where ever) to ask them about that. New Fuel Pump For 1984-1999 Yamaha Virago 1100 Xv1100 42h-13907-01-00. Abandoned Autos: Alfa Romeo, 1948 October '05: Auburn, 1935 April '05: Austin, 1950 A40 Devon: November '07: Austin, 1950 Atlantic September '05: Austin Seven. 73 Rings For Sale. Conversion of older carbureted Harley-Davidson ® engines to single fire is highly recommended. best top 10 manifold motorcycle list and get free shipping. The graphic below shows what occurs. I also found this rare velocity stack. This carb has a fuel atomizing "bomb-site" in the bore, and a unique 2-piece choke disc that spring loaded to relieve pressure upon a backfire. Troubleshooting - backfire through carburetor. However, if you ask a question that has already been asked and answered or is easily found in the factory manual, expect to either get no answer or a smart ass. Runs, has backfiring issue. Well it looks like I have some work cut out for me. Pretty hot here is S. Built on a -56 rigid frame with a -79 shovelhead, did sturgis 5 times from Denver area with no problems. I restored this one for the iron XR750. Some people refer to backfiring as popping from the exhaust while others refer to it as the engine spitting through the carburetor. Jet needle - This is a carb part that meters the fuel going through a jet, or hole. Power valve blown. 91-98 Harley-Davidson Dyna FXD EVO DYNATEK 2000 DIGITAL IGNITION MODULE ECU CDI See more like this Harley ignition module 32419-91A NOS FXRP FXR Police Evo FXRT FXRD FXLR EPS22571 New (Other) 30 results for harley evo ignition module Save harley evo ignition module to get e-mail alerts and updates on your eBay. Why does my engine spit or backfire? When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. If you don't have one you can get one by attending-a FAA 16 hour t raining course. I have a 2005 HD Heritage Softail Custom. As picture. Kick mechanisms in general have a free spot at the bottom of the kick stroke. This may cause an injector to malfunction and cause the engine to hesitate. Any easy fix?. If the engine is flat or will not accelerate, decrease the main jet by. The intake manifold is attached to the top of the engine by the intake manifold gasket, which has to be monitored as it is susceptible to cracking under the heat and pressure and allowing coolant or oil to escape. Yea, coughing through the carb & popping through the exhaust 2 different things. Use 64panhead's sequence, EXCEPT be sure to turn the choke OFF before kicking it with the ignition ON. Bike is not running right. cb750 Running a Pamco with barebones electrical, solid state reg/rec, new coils, battery, plugs, etc. I've gone through and double checked. I rebuilt the "Backfiring" is a pretty broad term depending on where you live. They will be less expensive than ordering through your Kawasaki dealer and, in most cases they will be 'in stock'. Of course, this assumes your carburetor (or F. And from 1936 to 1964, big twins were designed to require a minimum of effort to kick-through. However, you can use the stock Harley cable (’90-’99 models only) if you follow the Twin Cam choke cable instructions. Troubleshooting A Crankcase Breather That Is Blowing Oil If your crankcase breather is passing oil, chances are that something's wrong (Okay, we know something's wrong, but don't be too alarmed). Hannans machine shop in hayward did the work. I have a 46 pilot and will try a 48 pilot next as soon as Tattoo can get one. A condenser is part of the ignition system used on most small engines. THIS CARB CAN BE SET UP FOR SPORTSTERS, SOFTAILS AND DYNA'S. S&S e carb by the way completely set for primary tuning. Changing this jet to a larger size will delay the signal to the main jet,. Another shovelhead problem already Fuck me and everything I stand for, I'm just getting the absolute shit end of the stick. Carb issues with modern ethanol fuels have been a problem resurrecting many of that vintage that were designed at time of leaded gasoline fuels. It's cold here today, which doesn't seem to help either. Reading through a timing thread started in the Tech forum. End of bracket with sharp bend goes toward rocker cover. A carb will have an air screw or a fuel screw 99% of the time. Maybe I'll wait until fall to dive into it. The Panhead & Flathead Site. Sold to an eastern US dealer who bought it right enough to turn a good profit after some detailing. Another shovelhead problem already Fuck me and everything I stand for, I'm just getting the absolute shit end of the stick. The low speed jets in the carburetor are too lean. Bike runs good when idling as soon as I take it for a ride it starts popping and backfiring!! Dies out then I wait a couple seconds starts up then does the same thing over again!! Starting to get Frustrated!! Hope you Can Help!! Tried taking the carb off and cleaning it still does the same thing changed the points, plugs, coil!! Hope you can Help!!. and thats why harley has used it for the last 20 years. I'm thinking of trying it because some of the boys on the shovelhead forum recommend it with the CV carb. Troubleshooting A Crankcase Breather That Is Blowing Oil If your crankcase breather is passing oil, chances are that something's wrong (Okay, we know something's wrong, but don't be too alarmed). If the pilot circuit is rich, the engine will have a rough idle or may not return to idle without "blipping" the throttle. A single fire ignition eliminates the backfire problem and enhances idle quality. Hannans machine shop in hayward did the work. cb750 Running a Pamco with barebones electrical, solid state reg/rec, new coils, battery, plugs, etc. In the spring it decided to have some running issues. Ok so my bike has this bog that is pretty annoying. The single fire ignition uses separate coil windings and electronics to fire each spark plug independently. When I was researching how to properly set the float height for CB/CL 450 carbs I found a lot of information, but all the different posts seem to each be missing a step or a tip which might be beneficial to a person doing this task for the first time, or if they haven't. At the throat, an HS6. If the engine is flat or will not accelerate, decrease the main jet by. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. harley davidson talk forums. 041" wi brass washers to stop the exhaust pop & get it running OK. 5 turns out on the air screw you need a leaner pilot, and if you're less than 1 turn from closed you need a richer pilot. Damage and rust shown in pictures. Today my 2003 Sportster 1200 was riding strange. I used to stop to set points, adjust a carb, check a leak, or wander down the side of the road looking for a chain that jumped into the weeds an' hid, but now, I stop to work out the kinks that always develop in. In the spring it decided to have some running issues. For Harley-Davidson, the Ironhead was an important entry-level motorcycle. Generally speaking, it may be caused by a an exhaust manifold leak. This high resistance causes a very high amount of voltage to be generated from your ignition coil's secondary. The nitrous fed small block has set numerous records with its port-nitrous system and single carburetor, but recently went on the "No-Carb" diet when he converted to Holley EFI. For Sale or trade 2004 FXDL Dyna Harley Davidson 39750 kms,88 cu/in,5 speed,high air flow kit,custom pipes,sissy bar luggage rack,quick release windsheild,new brakes. More than a motorcycle part store, BikeBandit. 5 turns, you need a leaner pilot. The float-type carb has a float-operated needle valve that keeps the fuel level a constant distance below the edge of the discharge. It starts easy, idles well, but when I try to go I get crazy backfires on acceleration. Problem CONDITION … Carburetor Troubleshooting Guide. A carburetor backfire describes the small explosion that sometimes occurs when starting up a car. 05/23/2020 2005 Harley Davidson roadglide fltr | Touring | London | Kijiji. Like the subject, I'm not sure what's happening when I shut off the key, I occasionally get what seems like and electrical discharge/backfire when I de-energize the bike. C5 Ignitions and C5 optical ignitions are products offered by C5 Performance Inc. See posts, photos and more on Facebook. One at a time. a hot motor runs better on a lean mixture. The gaps are correct. Some people refer to backfiring as popping from the exhaust while others refer to it as the engine spitting through the carburetor. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. The lamp bulb is grounded by the ECM through the BK/Y wire. Went out for a spin today around 11:00 am. Harley CV Carburetor reference diagram. Sometimes it will backfire really bad when I hit the throttle and other times it will act just fine. 91-98 Harley-Davidson Dyna FXD EVO DYNATEK 2000 DIGITAL IGNITION MODULE ECU CDI See more like this Harley ignition module 32419-91A NOS FXRP FXR Police Evo FXRT FXRD FXLR EPS22571 New (Other) 30 results for harley evo ignition module Save harley evo ignition module to get e-mail alerts and updates on your eBay. Blip the throttle a couple of times and observe the results. Development Services Di- rior were taken by a county rector Gary Maidhof said the code inspector from a sher-building is a barn as defined iff's boat in the Withla-by state law. When I shut the key off and restarted it would idle normally for a short time then creep back up during riding. There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc. Re: what causes a harley to backfire Damaged distributor cap or rotor,Low Fuel pressure,clogged fuel filter, poor Carburettor Adjustment, Dirt or water in fuel, faulty valve lifter or spring,Valves need Adjustment,Worn Engine Valves,Or sticking Valves,Poor Ignition H/T Leads,Or ignition timing out. If you find that you go more than 2. no backfiring through the carburetor, you have your idle combination set properly. Hook the black lead to the ground terminal. For tuning procedures we have a number of manuals available to the left. The Panhead & Flathead Site. The first specific crankcase ventilation system was the road draft tube, which used a partial vacuum to draw the gases through a tube and release them to the atmosphere. 2005 Harley Davidson roadglide fltr | Touring | London | Kijiji. and thats why harley has used it for the last 20 years. com=0ASent: Wed, December 23, 20 09 11:52:33 AM=0ASubject: RotaxEngines-List: Re: Your Mechanic May have Jus. There are several reasons for a failure like this, here are the most common; air-leak at the magneto side crankshaft seal, too lean carb jetting, too far. Shop the best Shovelhead Vintage Harley-Davidson Carburetor for your motorcycle at J&P Cycles. The bike has the 111" motor, super G carb, and stock 2 into 1 exhaust. The CVK40 is technically a bleed type carb, with a variable venturi that's controlled by constant velocity (CV). Did you just replace your burned out ignition coil to have your new one burn out too? Here is why!The leading cause of premature failure of an ignition coil is due to a worn or bad spark plug ignition cable. THIS CARB IS A DIRECT FIT FOR ALL CARBURETED HARLEY AND BUELL MODELS FROM 1988 TO 2006. You can build a killer motor using all the best parts and machine and assemble everything with the utmost care, but if it’s a carbureted engine and the carburetor isn’t set up or tuned right your killer engine may never live up to its full potential. 05/23/2020 2005 Harley Davidson roadglide fltr | Touring | London | Kijiji. Sold to an eastern US dealer who bought it right enough to turn a good profit after some detailing. Look here for actual harley riders problems one of hundreds of problems of CVO's. Which usually doesn't happen. 1 Choke Cable. If you need replacement parts you'd be well advised to get them from your local Harley Davidson outlet. Troubleshooting A Crankcase Breather That Is Blowing Oil If your crankcase breather is passing oil, chances are that something's wrong (Okay, we know something's wrong, but don't be too alarmed). When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. Bike is not running right. ) The first successful turbo for the Harley big twin was this design which featured an IHI Turbo, an SU CV Carb, equal length primary tubes joining into a 2-1 turbo header; a 2 1/2" turbo. Like the subject, I'm not sure what's happening when I shut off the key, I occasionally get what seems like and electrical discharge/backfire when I de-energize the bike. Something loose? I took it to both of the Harley Dealers in my area and the first told me it was the jets and charged me $500 but that did not work, then I took it to the second and they rebuilt. Mallory supplied much of the “original-equipment” ignition components for Ford through 1948. •Always use an insulator block between carb and manifold. Keith Black. 4 engines are commonly known for intake gasket leaks and the 3. ? When you open the throttle the engine draws more air through the carb. A new piston and fresh rings will work wonders!!!!. If the pilot circuit is rich, the engine will have a rough idle or may not return to idle without "blipping" the throttle. and thats why harley has used it for the last 20 years. Shovelhead Cylinder Not Firing. Changing this jet to a larger size will delay the signal to the main jet,. my buddy knows a guy who lives here in town that's been working on harley's all his life and knows carbs inside out with his eyes behind his head, so if all else fails i will talk to him. 95% harley parts ranging from 1948 to 1997, very few new/old stock parts. 00 on a jet kit unless you are going to drag race on a continual basis go to your local bike shop buy a larger jet and a couple needle shims , also dont know what kind of pipes you put on but caution to cold weather riding with out Baffles it can cause a. To counteract the vaccuum, air will take the path of least resistance--including sucking exhaust gases back into the combustion chamber during valve overlap (the brief period of time that the exhaust and intake valves are open at the same time. If the motor responds with a gratifying blast without backfiring through the carburetor, the idle mixture is correct. How a Thunderheader™ exhaust system will affect your engine's performance depends on other modifications that are made. Motorcycle Spark Plugs. This solution completely bypasses the stator by using a 12 volt battery to power the ignition system. The all-new Softail Slim® takes that idea to the edge. Another time-warp car preserved in nearly original condition. Backfire comes out the carburetors. The gaps are correct. RB Racing's Harley Shovelhead Turbo. check owners manual for tuneup details and maintenance. Ok so my bike has this bog that is pretty annoying. I go on rides anywhere from 100 to 300 miles a day. his old leaky shovelhead rat bike makes Still got some minor tweaking to jetting in the carb as it still backfires a bit between shifts. Power valve blown. During production of the 1978 model year, a larger engine was offered with the FL touring bikes. The float bowl on the carb will be full however and will contain enough fuel to run the engine at tickover for a minute or so. If it backfires through the carburetor, back the idle mixture screw out another 1/4 turn. 5 out of 5 stars 18 product ratings 18 product ratings - Ultima R2 Performance Carburetor Carb Harley Evo Shovelhead Replaces S&S Super E. I've been through the S&S tuning procedure, but the cold start backfire problem is still there. SOLD AT $35,250. Abnormal combustion, more commonly known as knock or detonation, has been the limiting factor in internal combustion engine power generation since the discovery of the otto cycle itself. Harley CV Carburetor Mixture Tuning Notice: All instructions and the EZ-Just are intended for a Harley CV carburetor only. its a 78 shovel head. Its a beautiful spring day in the northeast and I am doing some spring bike cleaning. The Causes of Internal Engine Knock, and How to Eliminate it. The current from the ignition flows through the contacts and sends the voltage to the spark plugs, which ignite the fuel. If the motor responds with a gratifying blast without backfiring through the carburetor, you have your idle mixture right. alright guys heres the scoop, im in the market for a bike, and I found one that I want to go look at. To say don’t buy a Sportster you should be on a rice burner. One had to pay, what was commonly called, the Harley tax. I'll try to be a little clearer on whats going on, when cold it idles and runs but not great, still would backfire through the exhaust and pop through carb at slow speeds/light throttle with occasional blue flame from rear cylinder. Perhaps the only part of a motorcycle that is taken for granted more than tires are the spark plugs. Use 64panhead's sequence, EXCEPT be sure to turn the choke OFF before kicking it with the ignition ON. Nothing outragous but just one time it will barely be idling high enoug to keep running and then the next time I ride will be idling a bit high. fast,fun bike,call with any. A condenser is part of the ignition system used on most small engines. If you put another carburetor on other than a Linkert, then the problem ratio is increased. Founded in 1993 by brothers Tom and David Gardner, The Motley Fool helps millions of people attain financial freedom through our website, podcasts, books, newspaper column, radio show, and premium. Remove the Harley choke cable from the stock carb. I have a 1994 Harley Davidson, with 80K miles, that is backfiring under throttle. Bad Intake or Exhaust Valve: Intake and exhaust valves are present in every combustion chamber in the engine's cylinder head. If you know where your air screw is at on your carb turn it counter clockwise in 1/4 turns until it revs perfect. If it is an exhaust valve, it will backfire through the tailpipe. It idled pretty good, and ran cheetah strong, with some backfiring. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. This banner text can have markup. Most kick start bikes will require you to prime the engine: with the fuel on and ignition off, engage the choke, hold the throttle partly open and kick the engine over a few times. It has 15,000 miles on it right now, and I have had it since it had 0. Exhaust pipes are turning blue. If backfiring occurs by way of the carburetor then adjust the idle combination screw out another one/8 turn. The Causes of Internal Engine Knock, and How to Eliminate it. 041" wi brass washers to stop the exhaust pop & get it running OK. I have seen more than one motorcycle backfire through the carb because of that--- one was a '46 knuck that burned to the ground at a gas station. (one bolt) I am trying to rule out some other things also. then you might be interested in my killer performance tuned cv carbs. Take the carburetor cleaner and spray it where the intake manifold is attached to the engine. Blip the throttle a time or two, and observe the results. Before we jump into picking the best cam for a Harley, we need to bring a couple habits of cam shafts to light as well. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. best top 10 manifold motorcycle list and get free shipping. What it is, is incomplete combustion, fuel is left over, and shot into the exhaust pipes. Bike started fine but died after a few seconds. Using the same base engine, displacement was increased to 1340cc (80 cubic. Carb, Coil, Anything to do with the Gen. Perhaps the only part of a motorcycle that is taken for granted more than tires are the spark plugs. I decide to ride his Harley and it won't start on open choke during hot weather (It normally fires up happily on warm day with open choke). ·Forums > Harley-Davidson Sportster: Carb poppingthrough the carb canis not a Sportster thing to backfire through the Carb although they. i readjusted the valves, ran a compression test (125 lb. The motors were only suppose to be a half-heartedly "bump" kicked, not jumped on like the longer stroke Shovelhead demanded. A support runs from the block bolted to and through the carb and intake manifold. Which usually doesn't happen. Bad Intake or Exhaust Valve: Intake and exhaust valves are present in every combustion chamber in the engine's cylinder head. After buying a 2000 Dyna Wide Glide a year ago for half price from an unemployed friend who was moving in a hurry, I started to work on the low speed (and dangerous) carb cough. Blowing through a carb not designed for pressurization is an invitation for disaster due sealing problems, backfires, lack of float capacity and possible overflow problems not to mention no one ever tells you they can't possibly get it "correct" for all the different motors out there. The fault is similar to the one shown by a carburetor with a faulty accelerator pump. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. The carb is starving for fuel. This carb has a fuel atomizing "bomb-site" in the bore, and a unique 2-piece choke disc that spring loaded to relieve pressure upon a backfire. Alright I just fully rebuilt the top end on my 72 74" cone shovel. In the spring it decided to have some running issues. best top 10 manifold motorcycle list and get free shipping. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some - 1999-2005 Pontiac Grand Am. It still ran like shit. The carb is correct. It's only when. Early 1980's Models: Shelby Sawyer (the good looking one), and Brett Clark (credits: Hunter, Star Trek Wrath of Khan etc. Another shovelhead problem already Fuck me and everything I stand for, I'm just getting the absolute shit end of the stick. How a Thunderheader™ exhaust system will affect your engine's performance depends on other modifications that are made. Our Goal’s to Help Change the World by Helping YOU to Shine Bright! Now one of the top self-help & spirituality shows in 185 countries w/a new inspirational, motivational, spiri. Mallory supplied much of the “original-equipment” ignition components for Ford through 1948. I agree, oil is by-passing the cylinder and right on out through the exhaust valve. THIS CARB CAN BE SET UP FOR SPORTSTERS, SOFTAILS AND DYNA'S. It has a twin cam 88 with a big bore kit making it 95 cubic inches. Some carburetors have a slow speed fuel adjusting screw that. Use 64panhead's sequence, EXCEPT be sure to turn the choke OFF before kicking it with the ignition ON. However, if you ask a question that has already been asked and answered or is easily found in the factory manual, expect to either get no answer or a smart ass. ULTIMA PROGRAMMABLE ELECTRONIC IGNITION KIT. I get a lot of emails asking questions, this is the short list of the most frequently asked. Ride was in light traffic with some red lights and also a quick run up the freeway for about 7 miles then back on surface streets. And from 1936 to 1964, big twins were designed to require a minimum of effort to kick-through. There is a fuel feed problem that can cause this symptom. This solution completely bypasses the stator by using a 12 volt battery to power the ignition system. Why does my engine spit or backfire? When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. best top 10 mask devil list and get free shipping. From 1966 to 1977, the Harley-Davidson Shovelhead displaced 74 cubic-inches. See and discover other items: 2003 harley davidson softail air cleaner, mikuni parts, harley carb, harley carburetor, harley davidson air cleaner covers, mikuni carburetors for motorcycles There's a problem loading this menu right now. Save Share. This is also true of all road-going bikes sold in America for the last quarter century. Maybe I'll wait until fall to dive into it. Download Here If searching for a ebook 94 Mitsubishi Magna Workshop Manual in pdf format, then you have come on to the right website. 018 with the timing mark visible in window. Idle adjustment should not be a problem on your Harley's carb. stopped for gas one day bike would not start, there was a clicking coming from the relay. I'm about 2 - 3 turns counter clockwise from the stop on the enricher screw, and I've got the idle set to 1000 rpm. I used to stop to set points, adjust a carb, check a leak, or wander down the side of the road looking for a chain that jumped into the weeds an’ hid, but now, I stop to work out the kinks that always develop in places I didn’t know I had 20 years ago, and take a leak… yeah, I do believe that I was a Shovelhead in a past life, an’ it. We recommend you down load the HSR tuning books for Harley Davidson. we're still around $66. A solo seat and lowered suspension puts the rider just 25. Idle adjustment should not be a problem on your Harley's carb. Twin Cam: 1. I am not sure if the stuff to remount the carb comes with the carb rebuild kit, so a call to the tech service bunch at your supplier (J&P or where ever) to ask them about that. See posts, photos and more on Facebook. Diagnosing carburetor problems is relatively straightforward but problems can be time to consume and/or expensive to repair. Ignition: Crane Cams Hi-4 single Fire Carb: S&S Super E Shorty Lights; 7” smooth housing headlight, Vintage Ford Brake/Tail light. Shovelhead Cylinder Not Firing. What could it be. i readjusted the valves, ran a compression test (125 lb. In this video we tackle the rebuild process from the carburetor cleaning to a few modifications and especially the float adjustment of a Harley Davidson CV carburetor utilizing a standard rebuild kit. Air should pass without much difficulty, otherwise replace the filter. Damage and rust shown in pictures. How to Fix 5 Common Issues on Older Bikes a Harley-Davidson or a Honda, here is a list of five common problems and triage steps you can take to diagnose the nature of a mechanical issue. The CV carburetor may show signs of needing to be tuned. Bike started fine but died after a few seconds. Shovelhead engines 1966 to 1982 - Bolt bracket to front rocker cover using 5⁄16"-18 x 5⁄8" bolt, 5⁄16" flatwasher and 5⁄16" lockwasher provided in kit. Which usually doesn't happen. Possibly damaged by a backfire condition. Rode into town the day after Galena. Also if someone buy a vehicle, it is possible to check Vehicle History through VIN Number. (one bolt) I am trying to rule out some other things also. 79 Harley Ironhead, 80 Harley Shovelhead. Runs on choke - The vehicle may run on choke when it's warm but stalls if the choke is turned off. 05/23/2020 2005 Harley Davidson roadglide fltr | Touring | London | Kijiji. I have a problem no one at HD. Harley Davidson Shovelhead Service Repair Manual FL, FLH, FX, FXE, FXS, FXEF, FXB, FXWG, FLHS HD 8 Aug, 2011 KOMATSU 6D125E 125-2 SERIES DIESEL ENGINE SHOP SERVICE REPAIR WORKSHOP MANUAL – DOWNLOAD NOW. 1988 Harley Sportster 883 1983 HD FXR Shovelhead 2003 HD Heritage Softail 2006 Victory Vegas Jackpot 1980 Honda CB650 1976 Honda CB750K 1982 Honda CB750 1964 Honda CA95 1982 Kawasaki 550 1974 Honda CL360 1975 Suzuki GT550 1981 Honda CB750 1981 Honda CB750 1970 Norton Commando 1972 Yamaha U7E 1970 BMW R50/5 1976 Honda CB750F. If backfiring occurs by way of the carburetor then adjust the idle combination screw out another one/8 turn. After assuring correct ignition timing, if backfiring and rising pistons continue blowing pressure out the carbs, would check valve clearances (especially intake valves), because failure to completely close (seal) might be allowing compression and combustion to go back through the carb. Re: Backfires out carb « Reply #4 on: June 07, 2019, 11:00:10 AM » Stock Shovelhead hydraulic lifters get adjusted from the bottom up, not top down like EVO. Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake. Rode into town the day after Galena. Mallory supplied much of the “original-equipment” ignition components for Ford through 1948. Since then, all Harley-Davidson motorcycles make use of fuel injection. Use 64panhead's sequence, EXCEPT be sure to turn the choke OFF before kicking it with the ignition ON. Shovelhead, 1966 to 1979 and ironhead For Harley- Davidson If crankcase breather is routed through heads, 1993 and later carb kit must be installed. There are very few things as cool as a vintage dirt bike. Patient having history of smoking , alcohol use and drug and diseases like chronic liver diseases,anti-coagulation and many more flavors. The condenser is physically the same as a high voltage capacitor used in other types of electrical circuits. If it is an intake valve, it will backfire through the intake. Remove the Harley choke cable from the stock carb. If you want somethin cool and ready to drive here it is. 040 pistons, Manley valves blah whole nine. A lack of power to the ECM will cause the check engine lamp to be inoperative and also create a no start situation. I rebuilt the "Backfiring" is a pretty broad term depending on where you live. ,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). A carb will have an air screw or a fuel screw 99% of the time. If it backfires through the carburetor ("carburetor farts") you will want to back the idle mixture screw out another 1/4 turn. Take the carburetor cleaner and spray it where the intake manifold is attached to the engine. 4 cycle and 2 cycle. The motor is trying to tell you something, and it pays to listen. They were designed to run dependably. Today my 2003 Sportster 1200 was riding strange. What does constant velocity mean. It's 35lb lighter than before. This carb has a fuel atomizing "bomb-site" in the bore, and a unique 2-piece choke disc that spring loaded to relieve pressure upon a backfire. The carb is correct. It has a twin cam 88 with a big bore kit making it 95 cubic inches. The valves are adjusted too tight. I have seen more than one motorcycle backfire through the carb because of that--- one was a '46 knuck that burned to the ground at a gas station. My point; if you want a windshield, plush seat, etc. A support runs from the block bolted to and through the carb and intake manifold. This is also true of all road-going bikes sold in America for the last quarter century. Browse our large selection of motorcycle parts at the best prices. This is why you used to get some huge backfires when exhaust manifold gaskets developed holes in pre-cat days. It comes and goes. Which usually doesn't happen. How a Thunderheader™ exhaust system will affect your engine's performance depends on other modifications that are made. this carb is set up for shovelhead and ironhead harley davidsons. Sounds like something I will have to try. About 30 minutes total riding time with 2 quick. It's cold here today, which doesn't seem to help either. More than a motorcycle part store, BikeBandit. Runs on choke - The vehicle may run on choke when it's warm but stalls if the choke is turned off. (muffler, bladder or backplate. My point; if you want a windshield, plush seat, etc. It keeps pumping fuel/air mixture through the engine and into the exhaust. The solenoid is the coiled insulated wire. Jim’s adjustable push rods. Additionally, it conducts coolant through to the cylinders in order to reduce the temperature of the engine. Yea, coughing through the carb & popping through the exhaust 2 different things. then i removed. The place to sell your digital goods: MP3, Photo, Shareware - any download!. Slow Jet: Controls fuel mixture from 1/8th throttle opening to 1/4 throttle opening Needle jet (both the taper of the needle and the circlip position on the end): Controls fuel mixture through the midrange from 1/4 throttle opening. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and exhaust, better porting, and stronger valves and pistons. Carbs, CV vs. the fact is the harley 40mm cv is one of the best [high performance] carbs made. Changing this jet to a larger size will delay the signal to the main jet,. 8 is known for the intake manifold going bad. Bad Intake or Exhaust Valve: Intake and exhaust valves are present in every combustion chamber in the engine's cylinder head. **551 cams are not recommended with compression ratio of 10:1 or higher. The graphic below shows what occurs. 1978 Shovel Head BACKFIRE nicholas ingram Part 10 How to Install the Ignition Rotor Cam Sensor Plate on Harley Davidson EVO S&S Jims Shovelhead Carburetor idle mixture adjustment. If backfiring occurs through the carburetor then adjust the idle mixture screw out another 1/8 turn. If the engine is flat or will not accelerate, decrease the main jet by. The small engine condenser stores a high voltage charge. fast,fun bike,call with any.