Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. Any setting help is good,bike has been back and forward to bike shop for popping/backfiring on deceleration,just cant get rid of it. My 2 cents, the backfire is definitely due to being lean. Get a small piece of copper wire that will fit through the jet and make sure you don't have blockage. Backfiring on deceleration can be a symptom of lean fuel-air mix. This is a most important indicator of what is happening. On downshifting and deceleration, I'm getting a lot of popping through the exhaust pipes. Exhaust Popping on Deceleration: When you decelerate, you reduce the amount of throttle. In my experience, this has been 90% of the time, been a exhaust leak issue. It's smooth on both acceleration and deceleration. Sounds mean. Sorry about the delayed response, Dave. My ignition coil is old and the wires are not the best. So, the popping you are hearing is not back-firing. Instructions. I rode it, and sure enough, it sounds like a fireworks show when you chop the throttl. Backfiring on deceleration can be a symptom of lean fuel-air mix. Sorry about the delayed response, Dave. I've taled to turner's before and they said the only way to completely eliminate the backfiring would be to actually detune the motor and decrease it's efficiency and. Exhaust Popping on Deceleration: When you decelerate, you reduce the amount of throttle. "After removing my pair valve, I am still experiencing that annoying "popping" upon deceleration. Any time the exhaust is "opened up" the condition of deceleration pops is MUCH more noticeable and problematic. The Deceleration Pop Problem Decel Pop is many times a nasty issue to deal with. backfire (popping) on decelwhat's that mean? It has Two Brothers Titanium pipes and a PCIII. I solved a similar deceleration backfire on a CH250 by removing the 112 (lean) main jet and using a 115 or 118. I have this problem myself. It will also significantly reduce or eliminate low speed jerkiness and decel popping. Throttle response is awesome, idle is on the money, and only popping on a hard decel or downshift to high rpm. I wanted a bigger bike, so I just bought a 2006 FXDL Lowrider with only 3,000 miles on it. I finally got fed up and took the carbs off and thoroughly cleaned them. _V Star 1300 Riders_ - popping Backfire on decel - I have a stock 2009 V Star 1300 tourer and I find that on decel I am getting a popping or backfire. My mechanic talked about putting some kind of cones into the pipes at the cylinders to restrict the airflow. Why does a pin hole in the exhaust cause popping ? I would think that even on deceleration there is positive pressure in the pipes and not a back pressure that could affect the combustion in the cylinder. My 02 R1150RT started backfiring on deceleration more last fall. ,running pro kurakyn hypercharger and cobra pro hp 2 into 1 exhaust ,was previosly running with v+h slippons,still the same issue,bike shop having issue resolving this. It did not do this before swapping out the pilot. Backfiring and gurgling since slip-on install. The bike seems to run stronger, but unless it's my imagination, the backfire on decel is even worse. i cleaned them and now it will idle sort of and has gas in both carbs but still pops out of the left carb and backfires out of the tail pipes any ideas why or how to fix it?. 07 vtx 1300 backfiring and popping on decel It does have aftermarket cobra pipes and I know it was never jetted. New petcock. Maybe go another ⅛ a turn out. It's from Hanso and he's tried to tweak it. Thanks again for the pointers guys. Prior to having the bike dyno tuned, I never had any backfire issues. Here's my issue, and I have read (I think) all of the comments on backfiring in the forum. While this is usually something you'll want to avoid, an explosion in the exhaust or air. sounds good and runs great. Ran great after these were put on for about a year then I saddly took it to a Yamaha dealer for service - since the 4000 mile service it pops/backfires on deceleration when the throttle gets below 1/4 and surges at less than 1/4 throttle. But anyway - I'm really wondering just exactly what causes backfire on ACCELERATION - it does NOT backfire at all on decel Timing? But If it were timing, I would think I would have other problems too I plan to switch out the plugs tomorrow morning, and possibly all the filters too if I can find the cash. Popping, cracking and backfiring upon deceleration. What causes backfire on deceleration - Answered by a verified Motorcycle Mechanic We use cookies to give you the best possible experience on our website. Browse Harley-davidson Motorcycles. i went through the carbs and the left one was bone dry and the right was fine. If you got the newest flier from JP cycles , They have an interesting article in it about fuel inj. It will also significantly reduce or eliminate low speed jerkiness and decel popping. This explosion exits through the muffler and tailpipe with a loud popping noise. SOLVED: scooter really loud and backfires (pops?) on decel and almost sounds like a motorcycle now. But the bigger question is how does gas get there in the first place, and that’s a bit more complicated. Motorcycle Backfire on Deceleration – How to Replace a Carburetor Diaphragm. The bike has about 4000 miles on it and was not ridden much at all. 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. If I pull the choke about half way out no more popping. is all fine tuned. Don't forget to check the intake manifold gaskets! My bike ran great and only on a rare occasion would it pop when backing. Typically, a backfire on deceleration or "Deceleration Afterfire" would be caused by a rich fuel condition. Locate the idle mixture screw on the carburetor (not the idle screw). If a motorcycle backfires down through the entire r. In some cases, a backfire may cause a burst or flame to shoot from the vehicle's exhaust. If your bike has "air injection" in the exhaust port, removing it will prevent popping near the valve. com always has the largest selection of New or Used Harley-davidson Motorcycles for sale anywhere. My mechanic talked about putting some kind of cones into the pipes at the cylinders to restrict the airflow. If severe, it could overheat the exhaust valves and make them snap. As a guest you can view the forum and photo galleries, but you have to register before you can post or view attachments. sounds good and runs great. Ads by Motorcycle. 5-2" Inlet Hexagon Exhaust Muffler Pipe Slip On Scooter Motorcycle ATV Dirt Street Bike: Automotive - Amazon. This topic generates a lot of concern from inexperienced riders, or even from experienced guys who just hate the noise, so lets take a look at what causes it. Plugs have about 3000 miles on them, so I am changing them. He stated that the thimbel is the right size and is cheap. It had been sitting for a few years since I was using my other bike. Idles poorly - Fluctuations in idle RPM, stalling. it had screamin eagle 2's on it, I took those off and put on a set of khromewerks AR-2 pipes with mufflers and baffles. the decel backfire is a lean condition, my bike runs off the chart lean on decel, it crackles a lot and blows some nice flames, i wouldnt mine tuning it out but i hate working on my carbs, especially since everything else is ok. Backfiring on deceleration can be a symptom of lean fuel-air mix. Can be deceleration from high speed (60-80 kmh) or from low speed (40 - 60 kmh). Re: crf450 popping on deceleration « Reply #11 on: April 24, 2013, 04:49:43 PM » if you guys want to avoid this plugged pilot jet shit, all you gotta do is turn off the gas and drain the bowl, or run it with the gas off till it dies. My Kawasaki KLR has a deceleration valve like that, but it still farts a little on deceleration. That’s because the FP3 gives you the power to control your motorcycle right through your smartphone. If you are new to Bike Talk, be sure to register for free and join the conversation. Backfires - Popping on deceleration for a lean idle circuit or backfires in general. Don't forget to check the intake manifold gaskets! My bike ran great and only on a rare occasion would it pop when backing. This site is dedicated to folks on all the forums who help one another with information, mods and friendship. Who knows, maybe the leak has existed for such a long time that it seems like the bike has always backfired. I know that means im running lean. I went with flowmaster 40 series with 3" pipe from the cats back. Motorcycle Backfire on Deceleration – How to Replace a Carburetor Diaphragm. After a short ride, we stopped for her to get gas. Deceleration backfire results from a chain of events that begins with reduced pressure in the cylinders. On the way home her Harley started to misfire and run poorly. Apologies for recently flooding this section with threads. A KLR is a relatively low combustion pressure engine so higher octane is wasted. But the bigger question is how does gas get there in the first place, and that's a bit more complicated. Calendars Featuring the 13 winning photos from the Horizons Unlimited annual motorcycle travel photo contest! World Map Sticker for Panniers Show your route on your panniers. And also the bike stalls when gearing down and coasting to a stop sign at times (never used to do that). The trick is to let fresh air into the combustion chamber to minimize the backfire effect. I get a backfire/pop on deceleration, do you guys think it needs a re-flash or will it relearn on its own ?. Running the bike through a tank of gas, and still having decel popping, I started searching around for why this could happen, as the bike is mapped to the full exhaust. my vulcan has always popped a little on deceleration since the day I brought it home from the dealership im pretty sure some popping is normal since im all stock and the bike is still running well after 8 or 9 years that's aweful im questioning how long I've had the bike oh well its popped for ar least eight years and yes it does sound cool. Check out this How- To video and an gain a in-depth understand at the MCMD blog post http://motorcyclemd. The air cut off valve is there to assist in richening the mixture by reducing the amount of air in the mix. What causes a backfire in a motorcycle? running lean can cause your 400ex to backfire. Always more to have but for now till i get a tuner im happy. Generally, there are a variety of ways it get. The popping on decel is caused by a lean fuel mixture being ignited by the spark on the exhaust stroke. if it backfires on deceleration its lean if it pops on acceleration its running rich. I am proficient at tuning Buell ecm’s, wether it’s a throttle position sensor reset, air fuel value reset or installing a new race ecm. I have this problem myself. 5 Tips to Preventing Backfire on Motorcycle Exhausts When a motorcycle backfires, a malfunction in your motorcycle engine mechanics is evident. If the air cutoff valve(s) is working properly and you still have backfiring on deceleration, something is causing a lean condition. **** Remember to check for backfiring on deceleration only after the engine is warm and the choke has cut off the enrichment circuit. It does not do this if I floor it from a dead stop, only cruising from part throttle. Yep, carb backfire actually just like trying to hold back a sneeze with your mouth closed. Backfire is either unburnt fuel igniting in the exhaust system or in the intake manifold. He was concerned about the backfire he was experiencing upon decel. My Kawasaki KLR has a deceleration valve like that, but it still farts a little on deceleration. Backfires - Popping on deceleration for a lean idle circuit or backfires in general. My question is is this typical of this bike (I just moved up from a 1994 Sportster), or is there something I need to look at. com Motorcycle Insurance Motorcycle Parts Motorcycle Helmets Motorcycle Tires Buell Motorcycles Buell Motorcycle Forum » XB oard » Buell XBoard Archives » Archive through October 20, 2003 » Popping on deceleration. When fitting less restrictive pipes (slip-ons or full systems), the AIS can possibly contribute to excessive backfire on deceleration because these will cause a lean condition at idle. It is a popping resonating sound generated by a lean condition on deceleration. Ran great after these were put on for about a year then I saddly took it to a Yamaha dealer for service - since the 4000 mile service it pops/backfires on deceleration when the throttle gets below 1/4 and surges at less than 1/4 throttle. This time I didn't really have any stuttering, but the backfire was more intense than before. The backfire is caused by hot exhaust tempuratures igniting the unburned fuel in the exhaust pipe. Just lay it out for our shadetree mechanics. Did it three or four times, but won't do it every time. However, we are dealing with 2 different problems here. After adjusting it I now have a pretty bad exhaust popping noise on deceleration and when revving it up. But surprisingly, after remapping, the bike ended up pretty much back at what seems to me to be its original power/performance curve. Slight back-firing on deceleration. By changing exhausts to get a little more “roar” there has also been an increase in the loudness of decel popping. What causes a backfire? A backfire is often caused during rapid deceleration, as the engine tries to bring its timing in line with the lowered throttle. Sorry about the delayed response, Dave. He was concerned about the backfire he was experiencing upon decel. When you hear your motorcycle backfire, there can be a variety of problems with your motorcycle’s engine. My ignition coil is old and the wires are not the best. Exhaust Popping on Deceleration: When you decelerate, you reduce the amount of throttle. The 2nd Gen I am bike sitting has a very bad case of back firing when decelerating. He said that it would sound much better. Does that mean bigger pilot jet needed? Or turn another 1/8th or 1/4 in?? Anyone else with this set-up that can chime in??. Lots of popping and backfire on decel. I get a backfire/pop on deceleration, do you guys think it needs a re-flash or will it relearn on its own ?. Everything For The Honda Motorcycle! Gas Tanks, Exhaust, Velocity Stacks, Bobber Kits, Chopper Kits + FREE FAST SHIPPING on domestic orders over $199. Decel popping not backfiring. But, as compared It's only slightly louder (no where near obnoxious or "splatty" loud) but it definitely has more of a deeper/throatier sound. Yes, I can and I have reset adaptations. Exhaust is more common and it creates a loud bang instead of a poof type noise when backfiring through carbs or a throttle body. This spring my surging was worse as well. But surprisingly, after remapping, the bike ended up pretty much back at what seems to me to be its original power/performance curve. Unburnt fuel entering the hotter exhaust pipe on deceleration , like you said 108. I have read that it may be the anti afterburn valve, but would it stop if the clutch is pulled in?. has 34200mi on it. After about 15 mins she showed up and said her bike would not stay running. Am I doing any long. The popping on deceleration could be a couple thing's. The Deceleration Pop Problem Decel Pop is many times a nasty issue to deal with. backfire/popping on deceleration The bike runs excellent with a load on it, but when I come into a turn and let off the gas a little I get these nice little pops. Decel popping is fuel igniting in the exhaust system. Or would popping on decel be normal with that exhaust setup? Bike tops out at 95mph, when it could easily do 105 last year before i played with jets to get rid of popping. CycleTrader. com/deceleration-backfire-tuning-your-carb/ on adjus. Like I said I did the 2 screws to Chris's specs. It's from Hanso and he's tried to tweak it. But first things first, lets define the issue: Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. It still sounds a bit like a lawn mower but at least it sounds like a lawn mower with cajones now. The vacuum barb on the carb is capped. com was founded in 2014 and dedicated to the all new Ducati Scrambler motorcycles for enthusiasts, by enthusiasts. The backfire is gone, the engine runs fine and the spark plugs are the color they are supposed to be. **** Remember to check for backfiring on deceleration only after the engine is warm and the choke has cut off the enrichment circuit. When were the valves last adjusted? Tight valves cause numerous issues with the bike running right. replaced a faulty air cut off piston and my backfiring ceased. It runs smooth on acceleration but vibrates horribly on deceleration and pops and backfires. Since it is on decel, the main jet size shouldn't matter (at least for backfiring). motorcycles in the world. The rpm would drop below 1000 and instead of rising back up, shed die. Some bikes run rich on decel and will lightly backfire. Locate the idle mixture screw on the carburetor (not the idle screw). It is a popping resonating sound generated by a lean condition on deceleration. Exhaust Popping on Deceleration - Auto Repair - Talk Local Talklocal. Do you have the stock exhaust on the bike or have you replaced it? I get slight popping when I decelerate but I have replaced my exhaust. What I would do is try adjusting the idle mixture screw, it might be all that is required to eliminate the popping. › Community › Motorcycle Consumer News › Technical Issues and Tips › Road King backfiring This topic contains 7 replies, has 0 voices, and was last updated by SRG July 8, 2007 at 12:42 am. On the way out of the woods my 2006 sportsman 500 x2 was backfiring out the exhaust under deceleration. Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. The other kind of backfire is a wimpy *piffle-piffle-snap!* on deceleration, That's caused by dirty idle jets and passages. Unburnt fuel exits through the exhaust valve on deceleration, and ignites, causing the popping. Man, I hate that popping Doesn't sound healthy. Typically, a backfire on deceleration or "Deceleration Afterfire" would be caused by a rich fuel condition. I was under the impression that backfire/popping on decel was a bad thing, and that I needed some new gas after I got my bike. if the air cut off valves were not present there would be alot more backfiring during deceleration. Noticeable with stock pipes, annoying with aftermarket pipes. Or replace pop pop, with a single pop randomly. This is common. An engine backfire is an explosion produced by an internal combustion engine. try going up on the pilot jet. Based upon the data you've given thus far I would remove the float bowl and blast out all of the jets, in particular your pilot jet. Typically, a backfire on deceleration or "Deceleration Afterfire" would be caused by a rich fuel condition. One cylinder is dragging the other and since the gas doesn't all ignite, it accumulates in the exhaust and ignites when the exhaust valve is open on the exhaust stroke spark. What are the most common causes and cures for this problem on a fuel injected twin cam motorcycle? From Our Friends at DynoJet Popping on deceleration is due to unburnt fuel being ignited in the exhaust. i went from a 42 pilot jet to a 45, went from popping in neutral and decel to only on decel, so i put my fuel screw to 2. ,running pro kurakyn hypercharger and cobra pro hp 2 into 1 exhaust ,was previosly running with v+h slippons,still the same issue,bike shop having issue resolving this. Is the popping indicating rich? On a motorcycle with IR and pops on deceleration, just open idle mixture screw 1/2 turn (plus or minus) to richen mixture. Just a reminder for all those folks (Including myself) who've changed their exhaust system, ended up with a backfire (popping) on deceleration, and had no luck curing the problem by jetting the carb or fixing exhaust leaks. But the bigger question is how does gas get there in the first place, and that’s a bit more complicated. a little info: 2002 1200C, I got it this winter. With stock pipes the popping was noticeable, but no where near as loud as the "shot gun blasts" he is now experiencing with his aftermarket pipes (yes, the carb was rejetted after installing the new pipes). Running the bike through a tank of gas, and still having decel popping, I started searching around for why this could happen, as the bike is mapped to the full exhaust. Backfire is a condition described as a loud bang, poof, explosion, etc. Teses systems are on the late model sport bikes. sounds good and runs great. Also did you connect the Vacuum hose to the ACV diapghram, I presume it is a CVK carb and most of them have a ACV diaphgram. I have used a spacer at the muffler joint on my A-65 that tended to shift a bit creating an air leak. Common on motorcycles, very noticeable w/ loud exhausts Also if you remove the cat then definitely there will be noted backfiring during deceleration/throttle. The term 'backfiring' describes any instance where car fuel is combusting somewhere other than the combustion engine. Backfire on overrun Just bought myself an xt600 3aj and absolutely love it. Runs on choke - The vehicle may run on choke when it's warm but stalls if the choke is turned off. What would cause backfiring of motorcycle upon deceleration? 1956 BMW w mikuni carb occasionally backfires on deceleration, sometimes singularly and sometimes in clusters. It was also back firing alot on decel, and when I came to a stop it stalled on my twice. Any 4 stroke engine--even those that are flawlessly tuned will pop on decel. on my 08 kx250f it backfired and literally had flames come out of the exhaust once (before a new top and bottom end). Most exhaust popping on a Harley is actually deceleration backfire. Ads by Motorcycle. do NOT contact me with unsolicited services or offers. Item # 19 "diaphragm set" is a deceleration valve that is supposed to help eliminate backfiring by closing off an air passage in the idle circuit. If you got the newest flier from JP cycles , They have an interesting article in it about fuel inj. ====carb issues. Thought I could introduce myself with a question Ive ridden motorcycles for the last 7 years. Throttle response is awesome, idle is on the money, and only popping on a hard decel or downshift to high rpm. It idles nicely and has good roll on power. I'm not going to argue about it, I know it's worked twice for me on v-twins I thought was a lean codition and it wasn't. Re: popping on decel (fuel injection) If it is doing it just after you close the throttle and not in a specific rev range you are not going to be able to fix it. What would cause backfiring of motorcycle upon deceleration? 1956 BMW w mikuni carb occasionally backfires on deceleration, sometimes singularly and sometimes in clusters. However there are other places for air to get in. Any time the exhaust is "opened up" the condition of deceleration pops is MUCH more noticeable and problematic. However, when coming off hard acceleration it backfires and pops quite loudly. When a motorcycle backfires, a malfunction in your. I have since moved into a house so my bike work had to be put on hold for a while. I have K&N filter and Delkevic slip-on and I'm experiencing a backfire every now and then on deceleration. Idles poorly - Fluctuations in idle RPM, stalling. Mine runs pretty good. Causes and Cures for Popping on Deceleration There’s a lot of discussion about popping on deceleration. The 2nd Gen I am bike sitting has a very bad case of back firing when decelerating. Yep, carb backfire actually just like trying to hold back a sneeze with your mouth closed. Get a small piece of copper wire that will fit through the jet and make sure you don't have blockage. An open exhaust allows additional air to be “sucked up the pipe” during closed throttle and any unburned fuels, then ignite and “snap/crackle. This is an inexpensive mod that helps cut down on about 95% of the decel popping this bike exhibits when stock. I was under the impression that backfire/popping on decel was a bad thing, and that I needed some new gas after I got my bike. By changing exhausts to get a little more “roar” there has also been an increase in the loudness of decel popping. The first thing I noticed after the reset was more decel popping, stalling, and the loss of the extra low end torque it acquired after installation of the glass packs. Did I do something wrong? Leaking header joints, and pair valves are both causes for ignition of fuel vapors upon deceleration, as well as an improperly low idle speed, or improperly adjusted idle mixture. Backfiring / Loud Pop on deceleration a small diaphragm operated axillary fuel valve that feeds extra fuel when there is high vacuum to preven the decel popping. I think it will backfire on decel no matter what you do, there is no reason it would NOT do that, so it will. Typically, a backfire on deceleration or "Deceleration Afterfire" would be caused by a rich fuel condition. It's really a function of the idle fuel/air mixture. This extract from the Virago Site explains it succinctly. Since it is on decel, the main jet size shouldn't matter (at least for backfiring). Backfiring on deceleration can be a symptom of lean fuel-air mix. An open exhaust allows additional air to be “sucked up the pipe” during closed throttle and any unburned fuels, then ignite and “snap/crackle. This also occurs when you shut your engine while at high RPM. The bike has about 4000 miles on it and was not ridden much at all. When fitting less restrictive pipes (slip-ons or full systems), it is commonly reported that the AIS can possibly contribute to excessive backfire on deceleration. I had decel popping as well on the stock tune, when I uploaded the R3T redistricting tune it pretty much cured it of loud decel popping, just sort of burgled a but when I downshift,sounds good to me, before it was flatout backfiring. Re: popping on decel (fuel injection) If it is doing it just after you close the throttle and not in a specific rev range you are not going to be able to fix it. Backfiring on deceleration is caused by combustion air entering the exhaust piping wherever the connection is not air-tight. My VZ was popping badly on the over run, when I was cleaning the bike I noticed one of the nuts missing from the manifold. 5 Tips to Preventing Backfire on Motorcycle Exhausts When a motorcycle backfires, a malfunction in your motorcycle engine mechanics is evident. I checked my valves before I put my engine back in and they are in spec. Throttle response is awesome, idle is on the money, and only popping on a hard decel or downshift to high rpm. ) Anyway, what you are hearing is the engine backfiring as it decelerates. Common on motorcycles, very noticeable w/ loud exhausts Also if you remove the cat then definitely there will be noted backfiring during deceleration/throttle. If your bike has "air injection" in the exhaust port, removing it will prevent popping near the valve. CAUTION! You have entered a Harley based forum. My ignition coil is old and the wires are not the best. Go by the seat of your pants and the color of your spark plug rather than the popping as an indication of the jetting of your. Buy Universal 1. A back-fire or backfire is combustion or an explosion produced by a running internal combustion engine that occurs in the air intake system rather than inside the combustion chamber. Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. My 02 R1150RT started backfiring on deceleration more last fall. If you are new to Bike Talk, be sure to register for free and join the conversation. Backfiring on deceleration is caused by combustion air entering the exhaust piping wherever the connection is not air-tight. Before I rejetted, the pilot was a 48 (I don't know why, the guy who owned it before me did that) but main was still a. if not, do that 1st. And if you re-torque the head, you have to do it again!. The KLR's have a mechanism that blows air into the header just after the exhaust valves which ignites any unbearnt fuel when decelerating (i. Who knows, maybe the leak has existed for such a long time that it seems like the bike has always backfired. A fuel tuner and a dyno tune will give you better results than using a pre-programmed downloaded map any day of the week! Let alone using a pre-programmed downloaded map for a different motorcycle. Generally, there are a variety of ways it gets there, and a variety of things that can make the backfiring worse. I do have a problem I need some advice on. Right after you close the throttle the engine will run rich for cycle or two causing the "pop" the only real solution is to roll off the throttle instead of closing it abruptly. For a while. We will continue to strive to be the premier Ducati Scrambler forum dedicated to this youthful and exhilarating lineup of motorcycles from one of the most storied motorcycle brands in the world, Ducati. The term 'backfiring' describes any instance where car fuel is combusting somewhere other than the combustion engine. It's not a loud backfire, just a rumbling and popping. popping on deceleration #1 Unread post by debtman7 » Sun Mar 29, 2009 10:35 pm Well, after tearing down the carbs and cleaning them out (admittedly, mostly focused on the jets and bowls, didn't do a full tear down), my 01 duacti monster runs much much better. After adjusting it I now have a pretty bad exhaust popping noise on deceleration and when revving it up. Hi , i asked a qeustion about my Stang a little while ago, it was continuisly backfiring and i couldn't get it right, everything seemed to be right, timing, advanced timing. This also occurs when you shut your engine while at high RPM. The vacuum barb on the carb is capped. Some applications have a de-accelerating fueling mode which can be adjusted to help cure decel popping. Technical Discussion - Backfiring on Deceleration - Hi - I recently rejetted with #48 pilot jets. com Causes and Cures for Popping on Deceleration There’s a lot of discussion about popping on deceleration. Welcome to Bike Talk, a forum for all bikers and motorcycle enthusiasts. So after reading several threads, i backfire problems - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum. Any setting help is good,bike has been back and forward to bike shop for popping/backfiring on deceleration,just cant get rid of it. If a motorcycle backfires down through the entire r. Most exhaust popping on a Harley is actually deceleration backfire. If I have it at about 6000 rpm in 2nd gear in town and get off of the throttle, I will get a couple of pops on the way down. The Deceleration Pop Problem Decel Pop is many times a nasty issue to deal with. My question is is this typical of this bike (I just moved up from a 1994 Sportster), or is there something I need to look at. com is dedicated to the Honda CB750 SOHC and DOHC motorcycles and to their owners who love to ride, restore, and customize them. after the tuning session is complete the motorcycle is taken on a test ride to verify again that everything is right on. com/deceleration-backfire-tuning-your-carb/ on adjus. It's got aftermarket Vance and Hines pipes. I'm getting alot of popping and a bit of flames shooting out the pipe on decel and backing off the throttle on my 06 KTM560smr is this normal? I do have the JD jetting kit in there now with his recommended settings. If this popping just started happening you might want to do a leak down test. Lots of popping and backfire on decel. On downshifting and deceleration, I'm getting a lot of popping through the exhaust pipes. I have a 2007 V Star 1100 classic with Kustom Chrome 2. It only backfires on decel, seems to get worse when fully warmed up. No lights flickering or dimming. The factory Evolution engine's ignition can contribute backfiring through the carburetor. It runs smooth on acceleration but vibrates horribly on deceleration and pops and backfires. For a while. I'm done, said my piece. Motorcycle Repair Having trouble fixing your motorcycle? Just lay it out for our shadetree mechanics. This is a most important indicator of what is happening. My Bike Backfires During De-Acceleration After I Installed Aftermarket Exhaust. Yes, the popping is just on decel. No ifs ands or buts, that’s what causes it. lol Really not bad overall. Detonation is more serious and occurs in the cylinders. But first things first, lets define the issue: Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. Map optimizations such as throttle progressivity to improve responsiveness and in-app control over popping on deceleration let you dial in your ride to suit your style. Why would. 99 We specialize in custom aftermarket Honda bobber parts. My question is is this typical of this bike (I just moved up from a 1994 Sportster), or is there something I need to look at. Went back to 2½ turns to get the same results as yesterday, and then an extra ⅛ turn out.