Why Does My Harley Backfire Through The Carb

Too much advance timing will cause a backfire through the carb too. This can often lead to an excess of air in the mix, creating a lean blend. They work right out of the box 99. Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. An old mechanic’s trick to check for such a leak is to use a spray can of carb cleaner and a straw. Then, you will start to get metal in the oil. Use the wire probe, with some patience the wire will find the jet, work the wire into the jet, and with pressure push the wire through the jet. Reply; james mcIntyre August 20th, 2019 - I added v&h slip ons on my 2015 fatboy it backfires so Harley dealer did a stage 1 screaming eagle and it still backfires. While parked the car idles well and has good throttle response with no misses or backfires. How to fine tune a Harley stock carb that will keep up with the. How much do I need to lean out my carb for my elevation? Altitude has a direct effect on the operation of most carburetors. Amazingly an early Ford carb is as simple to rebuild, and adjust as is an air-cooled pre-1971 Volkswagen carb. which ignite any unburned mixture in the exhaust pipe. If all you did was switch pipes should be able to just richen it a little without changing jet sizes. I can get it to backfire through the carb in neutral by flooring it really quick. 454 Backfires - Problem Identified Hello All - Newbie Here - wanting to share a recent find. Ok boy and girls (and all the rest of you ), I'm having a problem with my Honda Helix. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Carburetor Troubleshooting Guide. The actual procedure will differ or the amount that is suppose to be out is slightly different for each different motor. Welcome to Harley Chat Group. Then, while the air filter is still removed, spray a little starting fluid into the carb through the hole under the air filter and start it up. It seems to be backfiring through the carb (single stromberg 150CD). Fix My Hog Video Membership. 1 Answer runs good when accelerarting when letting off fuel throttle carb loads up and backfires. Performer carb body so there is no fuel spillage. I bought a 1984 XV1000 a few months ago and I've been having sporatic problems with it. She says, "I have a 2002 John Deere riding lawn mower, and always try to take good care of it, but every time I shut it off, it backfires. At IDLE, there should not be any more than 5. The bang heard is the sound of this fuel igniting after the throttle has been closed while de-accelerating. This will return your Sportster to like new running condition. change the jets (as I did) from the stock 1406 jets to the 1405 jets and metering rods. Does it do it under light acceleration as well? Timing retarded or advanced too far can give similar symptoms to what you have. An out-of-round throttle shaft bore is often the source of air inleakage. Backfiring is when the fuel/air mixture is ignited and the flame travels back up through the intake manifold and out to atmosphere either through the carburetor or throttle body. This is why a carb for a 454-V8 engine will also work on a 262-V6 engine. if there any possible the pilot jet was broken or the size is incorrect due imitation product? or maybe i need to setup the float more lean? thank you for the reply Matthew. I added some newer fuel and added a gauge to check fuel pressure and it's good. I have changed the spark plugs and just tonight I finished adjusting the valves. Harley Chat Group. There is no carb adjustment. The problem is when I shift and let out the clutch my car jerks wildly and backfires out the carb repietly untill I let off the gas or feather it a little bit. Also back off ALL the rocker on that bank just in case they are too tight. I have a 69 Valiant with a 273. if there any possible the pilot jet was broken or the size is incorrect due imitation product? or maybe i need to setup the float more lean? thank you for the reply Matthew. That's why I suspected fuel pressure or bad fuel. As soon as I put the car into drive and attempt to accelerate, I get a nasty backfire through the carb and the car wants to stall. ***Adjust the PMS so that most, if not all backfire on decel is eliminated. I have never ridden a Harley before this Quite impressed overall. 1984 XV1000 backfires and sputters. Starting with one of the idle mixture screws, screw the needle in until the engine starts to go dead. I have a holley 600 on it and this is happening with the choke partially open and completely open. What can I do? Reply. At IDLE, there should not be any more than 5. If its still giving trouble, you might need to give the carb a good cleaning, which mostly sucks so because I'm lazy I'd try to run some barryman's b12 through it and see if that fixes it first. I had also reset the carb H and L to 1-turn out, and now it starts and sounds the same, BUT IT WONT REV UP AND SPIN THE CHAIN, AND BACKFIRES THROUGH THE CARB WHEN GIVEN THROTTLE. However, there were minimal discrepancies at the one-year mark. also try and drain the fule out of the float bowl, condensation can build up in there causing it to run poorly. I have a Kohler engine on my lawn mower and it will backfire after mowing if you shut it off right away. A carburetor backfire describes the small explosion that sometimes occurs when starting up a car. Engine starts and idles like a dream. The popping on decel is caused by a lean fuel mixture being ignited by the spark on the exhaust stroke. 0 v6 engine. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. I've never taken a carb apart, but I feel I could do this pretty easily now because you didn't just tell us what to do, but why. How To Cure Carburetor Stumble If this is your first visit, be sure to check out the FAQ by clicking the link above. Also do like Porknbeaner said and Double Check that distributor and timing ! That also might be why you damaged a push rod ! It only take 2 mins to pull a distributor and bring up to TDC and drop it back in. Runs clean everywhere else, no lag or stutter. In 1974, Harley FL Touring models switched from Bendix carburetors to Keihin, while the FX models continued using the Bendix carb. To find out what makes a car backfire and what should we do to solve this problem, let's roll up our sleeves and start now! What Cause a Car to Backfire: 5 Reasons behind the Problem Car backfiring is not alarming as long as it involves only screeching sounds. If the rockers and the valvetrain is still together, do a compression test. Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. now its gotten. Seadoo 717 Backfire through the Carbs Hopefully this isn't the problem but since you said your starter went, I have a feeling all is related. The engine produces exhaust gases that exit via the exhaust ports of the cylinder head. carb recently just had black film inside the hole. Or do i need to buy a diff. The idea, in theory, is that this air / oil mist will be sucked back into the engine through the carb and burned up in the combustion process. Definitely make sure the timing is set correctly and make sure the valve clearance is within spec. This is usually the first in a long list of changes to the engine. I've only had it running for about 700 miles now, still working out the bugs. Would that make it backfire through the muffler? I also cleaned the carb center bolt - it looked clean and the tiny holes are not blocked at all. ( Note: "Afterfire" and/or "Backfire" will not harm the engine at all!). Engine cutting out while riding, backfiring when I get it to start up again So i've had this problem twice in the last week or so on my bandit. Backfiring through the carb is fuel either escaping out the intake valve (valve not seating all the waycaused by bad valve seal, incorrectly adjusted valves) or ignition happening before the valve has completely closedpushing some of the exhaust out the intake. 1984 ATC 200 not idling and backfiring If this is your first visit to 3WHeeLeR WoRLD, please take a moment and look around. What can I do? Reply. No more backfiring, no engine run-on , but I still have a little a slight stumble under hard acceleration. It is nearly impossible for a carburetor to cause a vehicle to backfire. You may have to register before you can post: click the register link above to proceed. A few points richer slow jet will help this condition. It sounds very much (from your description) like an old Chevy I once owned. I can avoid the backfiring by reving it pretty high while letting out the clutch, also waiting till redline to shift. My guess would be that it is running lean and as suggested, guessing its a thermoquad, your accelerator pump needs attention. Possibly damaged by a backfire condition. I have looked over the boots & sprayed alot of starting fluid with no change in idle. Does your engine back fire and you don't know why? What causes a car to backfire? Here are five of the most common reasons why your car backfires. When my dad and I pumped fuel into a cup there was a layer of water on top of the fuel. Backfire may cause an objectionable popping noise with possible loss of power and forward motion. A lawnmower backfire makes a surprisingly loud noise, catching you off guard when you're wrapping up your yard work and shutting off the lawnmower. Rich fuel mixtures resist detonation while lean ones do not. Went out and finally managed to get my exhaust fitted to my downpipes using a gasket I made from a can of Macaroni Cheese Anyway, tried to start my bike after it and it wouldn't start, it was turning over but just wouldn't fire up, then it sounded like it was backfiring Battery got drained so I just fully charged it and same is happening - turning over but not firing up!. I have a 12. A backfire is back through the carb, a whole 'nuther problem related to timing issues. For pit bikes with smaller cc displacement engines, in order for a cylinder to fire efficiently, three separate components must work together; the fuel delivery system (carburetor), the ignition coil. The gas dripping down out the carb could be caused from simple flooding to more serious carb problems like a float or needle n seat problem. A No-Budget Fix For CV Carbs Written by Stick Fentzlaff Taken from American Iron Magazine #100. Backfire in an engine typically results from various malfunctions related to the air to fuel ratio. Engine is backfiring through the carb when I accelerate and looses power. It may be collapsing internally with heavy draw. How To Cure Carburetor Stumble If this is your first visit, be sure to check out the FAQ by clicking the link above. Re: 20 hp Briggs backfires thru carb I replaced all the fuel line and fuel filter. Its good for long trips, really comfortable at 90 mph+. thanks mart. It started a few months ago after I installed a TC88A ignition. I'm supposed to line up the t on the timing advancer then like the exhaust cam level with the head and count back and the intake goes between teeth 35 and 36. 2000 Harley Davidson Electraglide Backfiring? Replaced the OEM mufflers on my 2000 Electra (EFI) with Pig Pipe slip ons, it now backfires when decelerating can/do I need to to get it re-mapped to solve this problem?. ok, so my friend had my kz750b for a while and he couldnt figure out why i wasnt getting spark, turns out he was messing with the wireing on the points and the shaft it rides on, but now i figured out how to rewire it so im getting spark, but i cant for the life of me get it to start, all it does is backfire out the carbs, and sometimes the exhaust too depending on how i move the previously. Usually after it has sat for a while or when I first start it in the morning. Sometimes it will backfire really bad when I hit the throttle and other times it will act just fine. Here is exactly what reader Jayson asked the. I also static timed the engine but have not been able to put a timing light on it. Did have the valve clearance check done the other day. It has been 6-7 months since I was last able to start and run my boat due to work, money etc. Starts and runs fine, but when under a load or accelerating hard above 2000 rpm it starts backfiring through carb? What is the cause? And cheapest and easiest solution?. So what is a backfire, what causes it, and how can you stop your lawn mower engine from backfiring? What is a backfire?. So I now know its running a little rich, and more adjustment was needed. Why does my 2003 Fatboy cough and backfire through the carb? It only does it every so often. Also, what about the carb? Does it sound like it's toast, or is there a part I can look at/replace to get it running right again, as it did before the backfire. Backfires can cause it to rip. Sometimes it will backfire really bad when I hit the throttle and other times it will act just fine. I had also reset the carb H and L to 1-turn out, and now it starts and sounds the same, BUT IT WONT REV UP AND SPIN THE CHAIN, AND BACKFIRES THROUGH THE CARB WHEN GIVEN THROTTLE. last night i was try using 17. It may be collapsing internally with heavy draw. So - according to all the posts so far - the culprit for backfire on acceleration, the answer to my question - is Lean mixture. Plugs were fine but I put new ones in anyway. Over the years I have spent many a night searching for parts for my MM. Do not post these threads in any other forum. Look in the lower right-hand portion of the image, this is the area of the accelerator. While cranking it, it is "popping" / backfiring through the carburetor pipe, not consistently, but fairly regular. A backfire ignites the fuel, or something else flammable, outside of the cylinder where it should be ignited. I know my carbs getting gas but am not sure if it's reaching the cylinder. I have spark, i have compression and i have fuel, what the hells wrong. This fresh air makes the exhaust hotter (think of letting a fire have more oxygen) which aids in the combustion of the unburnt fuel. Pull the valve covers off and run the engine, All the rockers should have a good amount of travel, and be the same amount of travel. Is this a sign that the carb needs a good thorough cleaning or could it use a good valve adjustment. Has twin tillotson hd 14a's on it linked with a brass pull rod and both carbs have grose jets installed. Hesitation under heavy throttle: Deadspot & stumble. Imagine my surprise when I found multiple suggestions for fixing backfiring, but not a mention of fixing the deceleration valve that is only on the carburetor for this situation. i know to change spark plugs, used to do it on all my other cars, but i cannot find where my plugs are in this car!. And, when it isn't working right, the dreaded "Bog" and the always dreaded backfire through the carburetor are effects of an accelerator pump system that isn't equal to the task. I went down this past weekend and here is what happened. , while the engine is running or while shutting down. Recently my grizz has been popping/backfiring back through the carb at low rpms. Com Yamaha Grizzly Forums. its about 10 mins of backfiring thru carb, stalling, spraying gas out of the carb when stalls and shooting flames out thru the carb. First thing that came to mind was a partially sheared flywheel key, causing the engine to be a little out of time. I would slow down a little and then when I slowly stepped on the gas it would pop loudly through the carb and then take off. Check the air filter against the sun or a bright light. If all you did was switch pipes should be able to just richen it a little without changing jet sizes. Its good for long trips, really comfortable at 90 mph+. I guess monitor it, try different throttle positions and see if it gets any better or worse. Not thinking the plugs would be the issue since the engine was just rebuilt but I took a look at them for the hell of it and they look just as they should. Its purpose is oh so simple and its function is oh so critical. I have never ridden a Harley before this Quite impressed overall. I have a 12. This usually goes away once the engine warms-up. I have a 69 Valiant with a 273. My 68 shovelhead backfires through carb when trying to start very hard to get to fire but when it does turn on it - Harley Davidson Motorcycles question Search Fixya Press enter to search. Re: Briggs popping and backfiring through carb Well Bill, Your suggestion to run a mixture of gas and carb cleaner through it worked like a charm. Stock CV carb and Harley ignition, open air filter and 2 into 1 pipe with HP power baffle. Logged old age and treachery will always overcome youth and enthusiasm. Why does my sportster 883 backfire thru the carburater when the choke is off - Answered by a verified Motorcycle Mechanic We use cookies to give you the best possible experience on our website. For me, understanding the underlying principles in a piece of equipment makes working on it a lot easier. the scooter still backfires during deceleration. Carburetor backfire in 1965 coupe with 289 I just had a relatively scary experience with my 65 coupe. Clean the float valve good and set the float level. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. The backfires are mainly caused (in a normally functioning 4 stroke engine) by leftover fuel that was not burned (combust) inside the cylinder and goes out through the exhaust valve. they are solid lifters as far as i know. my next step is to change the intake/exhaust gasket. Deceleration popping occurs when you close the throttle. It's the problem with exhaust valve, there are air leak and been backfiring and hard to start. It's a QuadraJet. Carb balance was still quite correct. Welcome to Harley Chat Group. Re: Backfire through Carburator at high RPM I'd also check the fuel hoses and in-tank pickup. There can be a temptation not to consider golf carts proper automobiles, but they can often fall foul of the exact same problems which can affect a car. it ran like that for 2 hours to get back to the slipway. Removing the plug reveals oil on the plug and the smell of gas. Gradually got worse, sounds like a bad cam to me. Blip the throttle a time or two and observe the results. A Harley with a stock C-V carb. I believe the air/fuel mixing screw is sealed with an alluminum cap. Check out this How- To video and an gain a in-depth understand at the MCMD blog post http://motorcyclemd. Oil in it's reservior is smelling gasoline too. My guess would be that it is running lean and as suggested, guessing its a thermoquad, your accelerator pump needs attention. I had a post before though where someone posted a picture of the timing for my bike. This mixture can then build up in the hot muffler and ignite. 014 on one side and. Why does my 12. Harley Davidson carburetor tuning including simple instructions for getting the most out of your ride. The plugs look relatively good, but the electrodes get white and the engine gets hot like it's too lean. This will be replaced in the carb kit. Do you just want your Harley to run great so you can enjoy riding it? If you use a Screamin’ Eagle Pro Super Tuner (SEPST), Screamin’ Eagle Street Performance Tuner, TTS, Power Vision, or Screamin’ Eagle Race Tuner (SERT), MyTune is the Harley Davidson tuning software you need. When placed up against the gas inlet, the latter is great for sucking the last l'il bit of varnish out of those pinholes. Hope we can get to the. To begin with, the popping only occurred on deceleration, so acceleration was no issue. This was causing the rough idle. Terms often used are: Stuttering Hesitating Running Rough etc etc. carb recently just had black film inside the hole. I pulled the valve cover and its seems like the exhaust side has either gotten really hot and burnt oil to it or maybe has some blow by through the valve guides im not sure but they are functioning properly nothing just stands out. This simple procedure is a great Harley tech tip that applies to all Harley carbs from 1989 to present that use the CV style Harley Davidson carburetor. comA backfire that you hear in your tail pipe isA backfire back out through your intake. Check compression, very low compression will significantly reduce the air flow for that cylinder. Adjust idle mixture as shown above, problem #1-fix #3 4. While looking around I noticed that the gap on the ignition coil was. Many many how-to posts are on-line. It's like the ignition is almost being draw down or grounded when there is a large load applied. This causes hotter exhaust gas temps. Was that a backfire or a gunshot? Either way, it looked like more than a flesh wound that Harley-Davidson (NYSE: HOG) suffered Friday, in the wake of earnings numbers suggesting that this company. To check the fuel filter, relieve pressure from the fuel system (consult your vehicle repair manual) and remove the fuel filter. A backfire is a sign that your car isn't running efficiently and needs to be addressed in short order. Re: 20 hp Briggs backfires thru carb I replaced all the fuel line and fuel filter. I pulled the valve cover and its seems like the exhaust side has either gotten really hot and burnt oil to it or maybe has some blow by through the valve guides im not sure but they are functioning properly nothing just stands out. I went through most everything above figuring it was getting starved of gas since it would start on the first pull and run fine for a minute or two, then just die out and sometimes backfire. I assume that its' been re-jetted. The actual procedure will differ or the amount that is suppose to be out is slightly different for each different motor. The 91 XR250R came with a #40 stock pilot jet and #125 main jet, Last year I tear my carb apart to clean it and found the previous owner had it jetted at a #45 Pilot and #145 Main. A backfire is back through the carb, a whole 'nuther problem related to timing issues. CARB ON SHOVEL ; EVO: CV problem ; CV44 TUNING ; how do you adjust the VE's on a carb. Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. Backfiring between shifts, and discovered, by trial and error, that enriching the mixture solved the problem. Sometimes it will backfire really bad when I hit the throttle and other times it will act just fine. last night i was try using 17. 1984 ATC 200 not idling and backfiring If this is your first visit to 3WHeeLeR WoRLD, please take a moment and look around. Used my new German device - much better than that thing with the floating ball. I learned how to control my muffled back-fire flame emitting from the stock-style muffler tip, which was caused by cold air venting through my wear reduced diameter of panhead exhaust spigots. There was still a problem that made me lean towards a fuelling issue, my theory was that the fuel was heating up where the fuel pipe runs across the exhaust manifold and where it had custom manifolds to suit the trike frame the carb was very hot so I rerouted the fuel pipe and made a heat shield for the carb and this cured the remaining issue. At IDLE, there should not be any more than 5. I had also reset the carb H and L to 1-turn out, and now it starts and sounds the same, BUT IT WONT REV UP AND SPIN THE CHAIN, AND BACKFIRES THROUGH THE CARB WHEN GIVEN THROTTLE. Since it ran fine during these times, I ruled out valve issues, air problems, timing, and never even considered the plug. Here's the scoop. Engine is backfiring through the carb when I accelerate and looses power. Backfiring that results from damaged wiring disrupts the ignition’s timing, which causes a build-up of air and fuel in the engine. This backfire occurs when fuel ignites outside. The performance may not be optimum due to signal strength or restrictions, but if the jetting is close for one, it will be close for the other. Too much advance timing will cause a backfire through the carb too. If it does that at a certain RPM in any gear you may have to check your valve timing again. Why does my 883 backfire or pop thru the carb even when its warmed up - Answered by a verified Motorcycle Mechanic We use cookies to give you the best possible experience on our website. thinking this fixed the problem i began to drive her again, only to find she is still backfiring a lot and im noticing a popping/clicking noise around. Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. Well, I've performed this operation successfully maybe 20 times in the last year using the very same tools - So, I'm going to assume that by now I. Some of the fuel solenoids were two wire and one was a ground,if this is the case change locations. It is a popping resonating sound generated by a lean condition on deceleration. 4: Backfires in Exhaust Note: It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. If it's been more than ~3 months, you should clean out the fuel system and the carb. So what is a backfire, what causes it, and how can you stop your lawn mower engine from backfiring? What is a backfire?. Backfiring is dangerous and it caused by incorrect valve timing or ignition timing. You know how if it's advanced too far it starts real hard and rough but will rev to the moon, but if it's retarded too much, it starts super fine but sputters and bucks and spits and kicks. If the car has been setting for a while, the carburetor float valve may be sticking. I totally rebuilt the carb, changed timing, changed rods and jets, you name it. I'm new to motorcycling and new to this list. , while the engine is running or while shutting down. I've never taken a carb apart, but I feel I could do this pretty easily now because you didn't just tell us what to do, but why. The gas dripping down out the carb could be caused from simple flooding to more serious carb problems like a float or needle n seat problem. If idle isn’t smooth and steady, look for a vacuum leak in the intake manifold/cylinder head seal area. Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. It comes and goes. I can get it to backfire through the carb in neutral by flooring it really quick. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. The starter will turn over a few times then BOOM! and it starts. Note: backfiring through the carb can be timing or the carb set too lean. The backfiring through the carburetor (the coughing or spitting), on the other hand, frequently happens in the morning when the carb's air/fuel mixture is too thin. The method used to do this in all carburetters is to speed up the velocity of the air by means of a venturi or choke, and to use the consequent reduction of pressure in the venturi to draw fuel from the float chamber through a suitable jet orifice into the air stream. She says, "I have a 2002 John Deere riding lawn mower, and always try to take good care of it, but every time I shut it off, it backfires. I have the carb adjusted where it runs best. CARB ON SHOVEL ; EVO: CV problem ; CV44 TUNING ; how do you adjust the VE's on a carb. When my dad and I pumped fuel into a cup there was a layer of water on top of the fuel. they are solid lifters as far as i know. In all cases, moving the jet further into the carb leans the mixture, while moving the jet further out of the carb richens it. When I am at low rpm's and gas on it it will backfire thru the carb. It seems to be backfiring through the carb (single stromberg 150CD). Backfire through carb when accelerating. Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake. While looking around I noticed that the gap on the ignition coil was. Also do like Porknbeaner said and Double Check that distributor and timing ! That also might be why you damaged a push rod ! It only take 2 mins to pull a distributor and bring up to TDC and drop it back in. I ride 600 miles a day no problem. The last time I drove my boat it ran perfectly. I will check the valves. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. And yet get big money for a under built motor. backfiring golfcart 2004 ezgo golf cart gas powered runs fine but after riding a little while it has a little bit of a backfire every once and a while. The backfires are mainly caused (in a normally functioning 4 stroke engine) by leftover fuel that was not burned (combust) inside the cylinder and goes out through the exhaust valve. Adjusting the Pilot Circuit Contributed by Dan Abbott. Disclaimer. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. It is better to give the throttle a few pumps (2), and take your foot off the accelerator before turning the engine over and count slowly to ten. While looking around I noticed that the gap on the ignition coil was. My husband does minor work on our bikes and would do it for me if it would not involve pulling the whole engine. This is why it is not useful to compare your experience after a traumatic episode to those you were with at the time of the event. The backpressure can cause backfiring and rough running and in some cases will prevent the engine from starting at all. It seems to happen when I am pulling a perhaps 3-5% hill in direct drive, with the throttle down and the spark advanced pretty much all the way. I need help, my 07 rhino backfires through the carb at idle. and it may only happen when its warm because the valve clearance decreases as metal expands. my issues started with the boat having trouble starting, it would turn over but not fire. Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. Thursday, May 23, 2019 while riding my brand new Harley-Davidson 2018 CVO Road Glide FLTRXSE ($45,000) Motorcycle on a weekend trip to Louisiana, approximately 370 miles from my residences in. I learned how to control my muffled back-fire flame emitting from the stock-style muffler tip, which was caused by cold air venting through my wear reduced diameter of panhead exhaust spigots. Here is a general rundown. Backfiring can be used to describe combustion occurring through the intake (traveling backwards) or through the exhaust, although this is also called afterfire. time to find the leaky plumbing. A support runs from the block bolted to and through the carb and intake manifold. The bike is also missing and backfiring below 3. The starter will turn over a few times then BOOM! and it starts. I'm having problems with my freshly rebuilt 350 in my 74 Z. I bought this used when it was a year old. If the motor responds with a gratifying blast without backfiring through the carburetor, you have your idle mixture right. Is this a similar deal like the VTX?. A new gasket fixed the the idle problem. 530 backfires through the exhaust - John Deere Forum - Yesterday's Tractors Jump to forum order in days for posts. I just got a reman. There is no carb adjustment. through nozzle slot. it ran like that for 2 hours to get back to the slipway. I once had a motorcycle back in the 60s that had a cracked piston, acted the same way. Also, what about the carb? Does it sound like it's toast, or is there a part I can look at/replace to get it running right again, as it did before the backfire. The quad will now idle fine, and no more backfiring through the carb. also spark is good, I feel this is a timing issue as engine does not run fine on just starting fluid. Backfiring through Intake. It's the problem with exhaust valve, there are air leak and been backfiring and hard to start. Check for a lean fuel mixture. Is this a sign that the carb needs a good thorough cleaning or could it use a good valve adjustment. Even my holley 600 had 66 jets, so i swaped the 65 primary jets out for some 70s i had, plugs look fine, but I think 68 jets is gonna run lil better. I have a 69 Valiant with a 273. If the fuel is dirty and clogging the carburetor the engine will backfire. It will backfire, go for a hundred yards or so, then backfire again, etc. any help is appreciated!!!. Yes, I know this is a Magna board and the Helix is a scooter, but many of you have experience tuning/troubleshooting with other bikes, so I thought I would ask some advice. As a result of this engine rotation, more air/fuel mix is pulled through the carburetor or injector throttle body (dependent upon it’s ECM program). Reply; james mcIntyre August 20th, 2019 – I added v&h slip ons on my 2015 fatboy it backfires so Harley dealer did a stage 1 screaming eagle and it still backfires. Backfiring can be caused by intermittent firing of the ignition system or very lean fuel mixture. The video will expalin it all. How to Fix Engine Backfires Does your engine back fire and you are wondering why? We are a group of ASE certified mechanics that have created this guide to help you save money by fixing your car yourself or to see what you are paying for when taking it in for repairs. This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. Consider the reasons that cars backfire. 3) Replace the power valve. its not atomized well by the carb or isnt allowed to burn fully from a bad spark. comA backfire that you hear in your tail pipe isA backfire back out through your intake. We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". Harley CV Carburetor Mixture Tuning Notice: All instructions and the EZ-Just are intended for a Harley CV carburetor only. Would that make it backfire through the muffler? I also cleaned the carb center bolt - it looked clean and the tiny holes are not blocked at all. Re: Honda Clone generator backfires out the carb, any idea? thanks for the suggestions. The other possibility is that if you have been having dirty fuel issues, the inlet screen to the carb bowls may be involved (but hopefully the fuel filter has caught all the junk).