Motorcycle Running Rough And Backfiring
I fiddled with the pilot screw but that didnt do much. that has put many people on edge. 07 Dragon 700 Backfiring, running rough Polaris: IQ. A local motorcycle mechanic stated that he does this quite often by placing a thimbel in the line between those two valves. Even LarryBMW72 took her for a ride and agreed that the pig should run better. It never dawned on me that the battery was low on charge cuz it still did sta. I had an exhaust leak once, and I could feel it under acceleration, but this backfiring thing is different. But first, before you can say that you are running rich, did you check the CO level?, I would kindly advice you to take it to SVC an. The engine would run on the generator/alternator at higher speeds but would run rough, backfire or kill when the voltage dropped off at lower rpms. I pulled the spark plugs and they looked fine, went into town and picked up some new plugs anyways and replaced them, still running like crap and backfiring. Valve issues may also involve poor fuel economy, rough idle, stalling, high oil consumption, hard starting, and exhaust smoke. I ride it to lunch today and its worse. Backfire is a condition described as a loud bang, poof, explosion, etc. Bike was running rough at take off had to rev up and sometimes hesitant between 2500 and 2800 RPM on third and fourth gears. Without pictures of the plugs from both cylinders, and a rough guess of how old they are, no idea if the plug is abnormally dirty or worn. A little hard to start, backfires at low RPM, ok at high RPM, low power when taking off. Additive to clean carbs on a motorcycle. The bike is bone stock except for a 200 size rear tire. What Backfire when Starting - Harley Davidson Forums: Harley Davidson Motorcycle Forum. The bike "stumbles" on accelerationesp. Cleaned the carb 2x, new air filter, plug, and the gas is new. This forum has grown into one our largest forums here at Her-Motorcycle. the car's been idling really rough lately,. Sometimes a lean condition will cause a “hanging” idle that is slow to settle down to set idle speed. Currently I start the car and have normal function for anywhere from 30. it stopped backfiring and sounds kind of different at the exhaust. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Need Help Eliminating Backfire and Rough Running Briggs & Stratton Engine - I need some direction to solve a problem with my. My 2000 Sportsman 500 starts and runs fine, until its warm. Also noticed that opening the synch port on #2 to atmosphere has no effect on rpm. This means the vehicle will actually vibrate and feel a bit rough as the engine is running. 92000 miles. If the backfire is coming from the exhaust (more common, often noticed ) then un-burned fuel is coming out with the exhaust gases. My Kawasaki FS481v starts perfect (half pull) seems just fine when I first start. It popped 2 or 3 times easy on the throttle in 1st gear which means it is also misfiring, not just backfiring like a mf. It runs just fine after it starts and is not running hot. Ensured the opening that the solenoid valve closes was not plugged. The mechanic told me it might be carbon buildup in the engine. However over the years thanks to car developments it is unlikely that the ECU that controls a motorcycle's engine, eg. Running rough could cause the fouled plugs. Started and ran a little rough but not bad. Backfire carb My 2010 Patrol began to run rough with a little backfiring oncold days. Engine runs rough, backfires and has very little power. Texas Offroad Network Forums » Forums » Maintenance and Hot Mods » Dirtbike Maintenance - Advice, Addons, Mods, and Smart Tips » yz 450 rough idle and backfire on decel Register User Portal Page Forum List Calendar Active Topics Search Who's Online FAQ. So, I shut it down, washed all the carb cleaner goo off, and went for a ride. 454 Runs Rough. that's not backfiring, that's just popping. putting a tablespoon of gas in the throat of carburetor, engine starts immediately and runs 2-3 seconds until tablespoon of gas is consumed. In order to truly tune my carb, I want a better understanding of the symptoms of lean vs the symptoms of rich. Additive to clean carbs on a motorcycle. Low-speed running jets and multicylinder balancing screws are the items most prone to self-adjust during normal operation and often require periodic corrections. So I got a gauge set and sync'ed the carbs. Triumph Rat Motorcycle. Questions About Rough Idle And Backfiring. Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS. Dealer mode is showing no errors, C00. A repetitive backfires are generated when the engine is simply running at idle or at cruising speed and can be inline with the engine RPM. putting a tablespoon of gas in the throat of carburetor, engine starts immediately and runs 2-3 seconds until tablespoon of gas is consumed. NEW YORK (CBSNewYork) - Nearly two dozen people were hurt when officials say a backfiring motorcycle sent people running for their lives Tuesday in Times Square. Newer bikes are equipped with electronic bank angle sensors that shut off the engine if the bike lays down. Gave it some gas and it started backfiring, so I let off the gas and it backfired on decel. com so its time to change and make this section more friendly to our visitors. It goes well when going faster, its only when going slower and idling that it occurs. Victory Motorcycle Forum > Victory Motorcycles. Fix any EFI issues first. In order for a motorcycle to start. Although it did run better, I still had the issue of miss firing or not firing at all at low rpms for a few moments. Rider Safety. So I got a gauge set and sync'ed the carbs. 2003 Yamaha V-Star 1100 Reviews. A motorcycle backfiring in New York 's Times Square on Tuesday night sent crowds running in fear, following a cluster of deadly mass shootings in the U. backfire and running on one piston when going slow (1 2 3). that has put many people on edge. What most people recommend?. This means the vehicle will actually vibrate and feel a bit rough as the engine is running. Rough idle, hesitations, backfiring, please help! evolved to regular and with every run. net is the leading motorcycle forum for news, specs, reviews and discussions, including road and sport, classic and. MotorcycleForums. Running rough could cause the fouled plugs. Terms often used are: Stuttering Hesitating Running Rough etc etc. The engine started running a little rough at first. If your engine is idling rough and the check engine light is on, you can get cheaper scanner or code reader that will read codes from the PCM/ECM. I've had it for 14 years. Changed plugs(NKG) didn't change. Now I can start the bike and it runs fine at idle, gv it a lil gas and dies, now I turn full choke and give a lil gas and I can limp her home. Then it wouldn't even start. ran fine for a little while. After about 15 mins she showed up and said her bike would not stay running. I have replaced the AFM, O2 sensor, tested the ICV,replaced the TPS, replaced the engine temperature sensor, and replaced the intake manifold gasket. I also went ahead and cleaned the throttle bodies, air filter, and put new plugs and fresh oil in. If your bike is running rough, won't rev up or has an irregular idle, before you take off the carbs and open them up, check for vacuum leaks. Car is popping/Backfiring in the Intake? all the time it will run rough the pop then clear up run fine for into closed loop runs vary rough popping backfire. 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 idle is surging up and down and when i try to rev it up it pops and backfires. I did the Seafoam thing. Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. I've read other posts about rough idling and wonder if it comes w. When the engine on your motorcycle has an emission system malfunction, such as an exhaust leak or a moment of running rich or running lean, backfire occurs as a result. Coming off idle it loads up and bogs, and sometimes backfires. kinda smells a bit rich too. My bike runs great while riding around town in streets. A Kawasaki lawnmower engine that backfires on start-up has a problem with fuel delivery through the idle jet. Therefore, always replace the key if there are any signs of damage or wear. A motorcycle backfiring in New York's Times Square on Tuesday night sent crowds running in fear, following a cluster of deadly mass shootings in the U. If your dirt bike won't start or stay running, it's known by all how frustrating and embarrassing this can be. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. The airflow into the motorcycle is increased because of the difference in pipe design and other specifics. Took the bowl off, full of gas. I'd also do the quickie canisterectomy like Dave mentioned by pulling the vacuum line off the left throttle body and plugging the nipple. Add fuel to the cruise range, then ride the bike and see if there is a change. Street Bob Low-Idle and Backfire Problem Solved running. the engine races at a very high speed and will not idle down. When I am in stop and go traffic it seems to run at it's worst as it stalled out on me as I was coming to a stop in 1st and pulled the clutch in. kinda smells a bit rich too. With the inherent vibration of all engines, carburetor parts—primarily adjusting screws—tend to rotate, and therefore change their positions. I even have an audio file for you to hear the engine. Shovelhead runs/idles rough when warmed up ( backfires, noisy rockets, runing rich) If this is your first visit, be sure to check out the FAQ by clicking the link above. 20 reviews of RPM Cycles "Dropped off a KLR that was running rough and backfiring. After about a minute the car immediately started running better. Top 10 Scooter Problems & How to Solve Them! Posted October 28, 2009 The following information is for informational purposes only. Make an Oil Bath Air Filter for Your Motorcycle or Generator From a Coffee Can. Got off and listened closer, bike was running really rough, idle was down to about 1100 and it was still backfiring. that has put many people on edge. It tries to stall out when leaving from a stop in first gear. Moreso than the one between 3&4 Lots of heat generated quite quickly, really bad idle, missfiring, backfiring. I tested the voltage at the battery, and that is on spec for charging. Sometimes a lean condition will cause a "hanging" idle that is slow to settle down to set idle speed. 2003 Yamaha V-Star 1100 Reviews. you'll know a backfire when you here it, because your bike will sputter and idle roughly, then you will hear a very loud BANG! that sounds like a gun shot. Only did it for a block. The CV carb is dependent upon vacuum to function properly. Loud bang/backfire when starting cold. However over the years thanks to car developments it is unlikely that the ECU that controls a motorcycle's engine, eg. Symptoms may include a mower that is hard to start, runs rough or lacks power, or cannot be restarted when hot. These things are fragile, you need to use a real puller designed for t them, and yours are old enough to be at the dead or dying stage. 20 reviews of RPM Cycles "Dropped off a KLR that was running rough and backfiring. Harley Softail Misfire (Engine Runs But Misses) maintain and troubleshoot your motorcycle. Motorcycle running rough at idle? Have a 96 ninja and I cleaned the carbs and its running much better except at idle it just feels really rough and also the rpms are a little slow to drop when you let off the throttle. A backfire is a sign that your car isn’t running efficiently and needs to be addressed in short order. This could be cause by dirt in the carburetor or a plugged filter. The truck was running perfectly in the garage for 35 minutes, revving and idling finepulled it out to do a road test and revved a few times and blam, backfiring, won't idle. I've not had intake boots off to thoroughly check them - that's next on the list. And worse, many claims of lean conditions and rich conditions are contradictory. When the engine on your motorcycle has an emission system malfunction, such as an exhaust leak or a moment of running rich or running lean, backfire can occur. But they also said there was an injector recall. Gary France is on Facebook. Matter of fact, it just made my bike run all round better. You may diagnose valve problems at home with the use of a compression gauge or a vacuum gauge. I've not had intake boots off to thoroughly check them - that's next on the list. Sea Foam is a “do it all” motor treatment, fuel additive, carbon cleaner, fuel injection cleaner, fuel stabilizer and more. By understanding why backfires happen and knowing the methods of prevention, you can keep your motorcycle running like a dream. Even LarryBMW72 took her for a ride and agreed that the pig should run better. Loud bang/backfire when starting cold. I tested the fuel pressure and nothing. My Kawasaki FS481v starts perfect (half pull) seems just fine when I first start. Increase the size of the main jet. Had a similar issue on my 97 Dragon 700 early last season and after a lot of digging , I found a plastic rivet tail stuck under a reed in the reed valve body, took it out and issue went away. 035 (as per the NGK catalog), Still sputters, coughs, backfires, etc. At idle it burbles and backfires like the video shows. If it still backfires, check the timing, and set it to stock or 8-10 deg base timing. Thanks to all who responded. It started at maybe 1000 miles from new. I believe it might have something to do with the cold air that is rested within the exhaust when not riding it for a while and the weather or the garage being a bit cooler and when starting it up the exhaust starts running and possibly some sort of reaction occurs within the exhaust causing a backfire?. Rough Cut (no reporter narration). The engine starts, runs about 3 minutes and then starts stumbling, backfiring, and eventually will stall out. But when I accelerate out of the parking lot it hesitates and really sputters. Backfiring, sounds weak at an idle and even died on me once. The backfiring continues even if the RPMs are held so it is not an acceleration or deceleration issue. It probably is too rich to run. Witnesses said it sounded like. MAKE SURE THAT THE IDLE MIXTURE SCREWS ARE PROPERLY ADJUSTED. 6 hours since last top end and valve check. It hadn’t ran since 95 but now that I have cleaned the tank; replaced oil, plugs, fuel filter, and air filter; it actually starts and runs. Have drained the gas tank and put a small amount of carb cleaner, put new gas in hi octane and rode a few miles, but still does the same thing. My car is running extremely rich and has a terribly rough idle with extreme hesitation when applying throttle. that has put many people on edge. So, the engine runs rough (lean) and if it gets bad enough, may not run at all. To test the main jet, do a roll-on from 50-mph to 70-mph in 3rd gear. Your Flyscooter should be looked at by an authorized Flyscooter dealership. I'm going to recheck the plugs but don't understand how it could have run so well on my way in town and then suddenly start with all the issues on the way home. 1980 xs 650 Bike wont idle, runs rough. that has put many people on edge. Note that the soft metal flywheel key can also be damaged without totally shearing which may result in slightly incorrect timing. it won't be in sync with your engine running. We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". But it was hard to start, and when I did get it running, it "pops" back out the carb and the engine stutters for a second. Everything has been replaced apart from the body (seals, gaskets, screws, washers, springs, float valve, main jets, slow jets, needle jets, choke/throttle shafts even the vent tube!). While the alky is good for me it's not real good for your bike. Published Dec 7th, 2015. NGK 5K ohm caps can be obtained at. The department tweeted Tuesday. Even LarryBMW72 took her for a ride and agreed that the pig should run better. I get home and I check all resistance of caps, the same cylinder that had a bad plug #4 ended up the cap was ohming in at 312k which right away I knew it was bad. Hello all, I am the owner of a 95 900SS-SP. Afterfire occurs after the engine has been shut off. When I would ride it for a few miles, shut the bike off and restart after a fuel fill up for example, it would run great and no popping or backfiring during deceleration. Lastly, carefully check the little 4" or so crankcase breather hose on the left-side, top rear of the engine - these must be replaced ever five years or so, failure can let unmetered air into the system leading to lean condition evidenced by rough running and poor idling. The CV carb is dependent upon vacuum to function properly. checked solenoid on bottom of carburetor …. Witnesses said it sounded like. I have an 03 ltz400 it is very hard to start. I did think that I had a problem with my clock that turned out to be a low bat. Lean the main jet under load until it starts to nose over, and then make it just rich enough to run OK, and your black carbon will be gone. On to the problem. I replaced the plug wires. Rough Cut (no reporter narration). fouled plug? Stuck choke? Any other input is welcome. Firstly it's a race bike (ex British Supersport) that has had quite a bit of tuning including top end engine tuning, custom ecu and throttle bodies stripped of all the vaccum slides and other needless parts. 92000 miles. A motorcycle backfiring in New York's Times Square on Tuesday night sent crowds running in fear, following a cluster of deadly mass shootings in the U. Backfiring thru the carb at idle when warm probably means you are running a tad lean. I would try just replacing the two primary plugs first and see if that does the trick before I started tearing the bodywork off. Do all the above and then yank the tank to look at the wire harness where it turns down behind cly 2. 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. After cleaning, repairing, and reassembling your carburetors, you’ll need to balance and synchronize them. If I leave the choke on and let the bike get warm it runs for a bit and then slowly dies. Lubricate with decent lube on the inside run first, preferably when the chain is warm. Popping/backfire through exhaust on deceleration Prior to parking it a year ago, the motor had a real bad bog at WOT and one of the intake banks feeding the plugs looked lean compared to the other bank. Why is my motorcycle running rough? My motorcycle runs fire when its accelerating hard but when its at low revs it stutters and lags. The truck was running perfectly in the garage for 35 minutes, revving and idling finepulled it out to do a road test and revved a few times and blam, backfiring, won't idle. I've had it for 14 years. Engine starts and idles like a dream. A backfire is the result of fuel being burned somewhere other than in the cylinder. If the scooter idles well and runs fine at low speed, but has problems at high speed, the problem may lie inside the carburetor with the main jet. Cutting the throttle to idle will sometimes keep the engine running, wait 15 sec and then take it up to full load, will run 5-10 minutes and then repeats the stumble. For some reason backfiring has become a popular issue lately on forums I visit. The idle is surging up and down and when i try to rev it up it pops and backfires. Harley Riders USA Forums » Harley Davidson Motorcycle Models » Softail » 97 Evo running rough Started up but running rough. 1984 XV1000 backfires and sputters. I had an exhaust leak once, and I could feel it under acceleration, but this backfiring thing is different. Every once in a while, when I start my bike in the morning, either with the choke on or off, I get a loud bang out of the exhaust instead of it starting. Thought at first that, after treating the bike gently during the first run-in bit, I was getting lazy with the clutch or throttle. When the DME temperature starts to fail, it normally sends a higher than normal temperature signal to the DME computer. Note: Backfire and afterfire through the carburetor will not harm the engine at all! Find out the most common causes and possible fixes for engine backfire and afterfire. #6 – Rough Engine Idle. I am aware of a valve cover leak but it is because one stud is stripped. Total Motorcycle Forums. The engine starts and runs fine, when I leave for or from work. 3 hours ago · Lopez tries to get a feel for Bravo by talking to his new teammates but runs into rough territory with Clay and Sonny. I did think that I had a problem with my clock that turned out to be a low bat. Changed plugs(NKG) didn't change. When I take off the choke bike dies. It may well be that these events are the hesitation & stumble problems described in this article. I had it in the dealer last fall and they could not find a problem. Basically, the idle was rough, the surging was driving me nuts, from 4,100 rpm and above there was excessive vibrations, power seemed to taper off above 7,000 rpm and I could barely get her to 180 kph (112 mph) with the Givi bags on. It goes well when going faster, its only when going slower and idling that it occurs. 2002 Subaru Forester Misfire/Rough Running was created by RyanS93 Hi everyone, I wanted to get some thoughts on the problems a friend of mine is having with his 2002 Subaru Forester (2. Was running great and then towards the end it started running rough, backfiring a bit and sputtering. Could it be running rich? Just had the carbs cleaned by someone that maybe didn't adjust the fuel mixture correctly. If we raise the RPMs the popping get worst with occasional loud pops. I get home and I check all resistance of caps, the same cylinder that had a bad plug #4 ended up the cap was ohming in at 312k which right away I knew it was bad. A severe case of stiction will cause a vehicle to spit and sputter consistently. I did think that I had a problem with my clock that turned out to be a low bat. I finally got it to start and it seemed to run good but again after a few short trips it wouldn't run good unless I kept it choked. Will not start. The engine should run a bit rough at idle when cold if jetted properly. Gary France is on Facebook. Basically, the idle was rough, the surging was driving me nuts, from 4,100 rpm and above there was excessive vibrations, power seemed to taper off above 7,000 rpm and I could barely get her to 180 kph (112 mph) with the Givi bags on. Try putting 1/2 a can of Seafoam in the tank with a couple of gallons of gasoline, then run the bike long enough for the mixture to get down into the carbs, maybe 5 minutes or so, then let it set overnight. thanks for any input ahead of time. You should pull the carbs and clean them. As a guest you can view the forum and photo galleries, but you have to register before you can post or view attachments. A little hard to start, backfires at low RPM, ok at high RPM, low power when taking off. Conclusion. If the backfire is coming from the exhaust (more common, often noticed ) then un-burned fuel is coming out with the exhaust gases. Cylinder #4 screw has some effect, but #2 has no effect at all. by surging power I mean, Ill give it gas and it will start to pull, then cut out, then start to pull again, then cut out, then pull, etc *black smoke coming from exhuast, when I rev engine. Here are some thoughts on getting a none running bike, running. The engine would run on the generator/alternator at higher speeds but would run rough, backfire or kill when the voltage dropped off at lower rpms. Fire the motorcycle up and take it for a ride. If I just have it in transport mode or just sitting there it starts to sputter/backfiring. i have a 2004 bullet and here's my current dilemma: i recently replaced the rubber ring connecting the carb to the engine as it was cracked and i was getting a lot of backfire. After a short ride, we stopped for her to get gas. 3 Van was running great then while driving down the road it was as if someone flipped a switch. When it is running lean, there is more air than fuel. Share Thread It will not idle and run very rough backfiring and dying constantly. Tractor back Firing. I get home and I check all resistance of caps, the same cylinder that had a bad plug #4 ended up the cap was ohming in at 312k which right away I knew it was bad. 6) Pull-off diaphram blown. It was running pretty rough when I first bought it. After about 15 mins she showed up and said her bike would not stay running. I've had my '05 VStar for a couple weeks now and have been doing just parking lot practice and a little tooling around the residential streets. Motorcycle running rough at idle? Have a 96 ninja and I cleaned the carbs and its running much better except at idle it just feels really rough and also the rpms are a little slow to drop when you let off the throttle. Many customers also report a slight increase in engine braking when going downhill. I was wondering if anyone could be of some help- My 2005 Polaris Sportsman 700 is backfiring on deceleration. However over the years thanks to car developments it is unlikely that the ECU that controls a motorcycle's engine, eg. Engine Runs Rough Under Load. Probable Solution to the "Firing on One Cylinder" Issue50MPH at WOT No More!. If you do not think fuel is not the problem, you have to determine if the engine has spark. A fuel mixture that is rich could be the cause of rough idling. C50 running rough, backfiring, won't stay idle. ? I am resurrecting my 1884 Honda Nighthawk 700sc. Threads Tagged with backfires. except I noticed she was running rough & backfiring a lot more than she used to. This morning I head for work and notice things arent just right. Rough idle, backfiring, and stalls after warmup. Running rough, hesitates, stumbles, runs great at 1/3 throttle. that has put many people on edge. Electronic ignition is not adjustable. My bike runs great while riding around town in streets. Now, everytime I start the bike it begins to rev, even though I am not opening the throttle. Rough Cut (no reporter narration). That should get it running. Rough idle, low power on acceleration, backfire on acceleration along with black smoke, hesitation Out of the blue the 75 FJ40 started this behavior after starting it up two days ago. A motorcycle backfiring in New York's Times Square on Tuesday night sent crowds running in fear, following a cluster of deadly mass shootings in the U. I can get it to backfire through the carb in neutral by flooring it really quick. As a guest you can view the forum and photo galleries, but you have to register before you can post or view attachments. Even LarryBMW72 took her for a ride and agreed that the pig should run better. engine running rough and backfiring Sign In have a 65 Chevrolet c10 pick up with a 265 v8. Cover every aspect of repair. After it starts to get warm it starts to sputter and has a little backfiring. Download a Fatboy, Roadking, Sportster, Softail, DYNA, and Touring repair manual in seconds. So, the engine runs rough (lean) and if it gets bad enough, may not run at all. Backfiring thru the carb at idle when warm probably means you are running a tad lean. Carburetor Troubleshooting Guide. 454 Runs Rough. Backfire carb My 2010 Patrol began to run rough with a little backfiring oncold days. If it does, you will want to hold onto it. I put star washers under all 4 screws. Rough just off idle and while trying to diagnose the issue, the bike refused to go above. A guy starts his bike on choke, runs into the house for a minute or so to finish whatever, the phone rings and all of a sudden the phone call is more important than the bike bike ride and the bike is forgotten. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). If it does, you will want to hold onto it. Keep workin at it. But, I'm not the one on it either but when I asked her about it she said it is not hot like my bike was before the EJK was installed. When running it up through the gears I get a backfire between shifts 3. Electronic ignition is not adjustable. #6 – Rough Engine Idle. Power valve blown. According to police, at least one. 20 reviews of RPM Cycles "Dropped off a KLR that was running rough and backfiring. Therefore, always replace the key if there are any signs of damage or wear. Engine running and electrical problems ? As motorcycle electrics gets more advanced so too the number of problems that can occur. It's a 4 into 2 so 3 and 4 cylinder are on the same tailpipe. If the backfire is coming from the exhaust (more common, often noticed ) then un-burned fuel is coming out with the exhaust gases. All of a sudden my bike is running rough. Car will run rough ,backfire and you may be able to here it rattling. If I leave the choke on and let the bike get warm it runs for a bit and then slowly dies. A scooter’s smaller wheelbase makes for better maneuverability and turning. Re: Runs rough, misses, backfires, battery goes dead ive had the same problem you had. After it starts to get warm it starts to sputter and has a little backfiring. Newer bikes are equipped with electronic bank angle sensors that shut off the engine if the bike lays down. As you ride your newly jetted motorcycle, listen to how it performs at all levels of throttle. Other causes of backfire are bad or weak fuel pumps, low fuel pressure, or clogged fuel filters. Backfire/runs rough at high RPM It broke an intake push rod and I replaced it and then adjusted the valves to the recommenced clearances. running regular in a higher compression engine can cause the pistons to actually be twisted from side to side during the burn rapid. I have set them 2 turns out, synchronized the carbs. More than likely your engine is "popping" not really backfiring. It idles fine, runs so so on acceleration, but the popping and backfiring during deceleration was getting worse. Under very hard acceleration, the bike seems to just flybut even when I hold the throttle steady at 3K rpms on upit runs rough and backfires and sputters. it will sort of miss and run rough.