Harley backfire on startup. May 22, 2011 · hello, i still cant figure this out.

Harley backfire on startup Discussion on V-Twin Harley Davidson motorcycles including Dyna, Electra Glide, Softail, Sportster, and more. when I lifted the choke she would backfire through the exhaust while trying to turn over. com Oct 30, 2011 · Start it and take a rag or glove and cover the exhaust momentarily and see if you hear leaks upstream. And as I am trying to leave a stop sign. Popping on deceleration is due to unburnt fuel ignited in the exhaust. Common causes include problems with the fuel system (like clogged fuel injectors or a dirty fuel filter), ignition system issues (such as faulty spark plugs or ignition coil), and incorrect engine timing. Quite the head-turner, isn't it? However, it's not as cool as it sounds - it's a sign of potential issues in your ride. It will backfire when accelerating sometimes. Common Reasons for Backfiring on Acceleration Oct 22, 2015 · I have an 03 sportster 1200 that is all stock it runs great under load but when just cruising in any gear it's fine untill I touch the throttle jut a little as soon as I start to accelerate it misses. It turns over but wont fire the abs light comes on and just flashes and it has a low fuel warning but the bike plenty of fuel. After it warms up it will cut out, backfire, and just die a lot while riding down the road. Running lean causes lousy idle and running hot, among other things. My indy said it was only the 2nd one hes ever seen actually broken. If this process happens at a start-up, you will experience a motorcycle that won’t start but backfires. Any ideas of what is causing this? Diagnosis? It is a 2004 HD Roadster 1200. The recovery guy made a guess that it could be a failed spark plug (which I hope is all it is) but he didn't have any tools to check (Imperial sizes in a metric Dec 3, 2005 · First start of day: Full out choke. It will Enguage with a turn, hesitate, then start rotating consistantly and will start the engine. I replaced fuel valve, wires, plugs. Mechanic's Assistant: What is the make/model/year of your bike? Oct 31, 2023 · Sputtering in Harley Davidson motorcycles can manifest in various ways. 09 fat bob cvo 3000 miles. A backfire can be attributed to the malfunction of the air gasoline mixture, and combustion happening anywhere other than the combustion chamber. This will reduce the backfire or after-burn effect. 7. 1978 Strokershovel Lowrider 100 inches. Aug 22, 2008 · about 2 weeks ago, I noticed my fatboy backfiring when changing gears or when throttling down to slow. Feb 1, 2012 · How dd it start with the stock ECM? Al Stock 110" mufflers Stock Heads Andrews 26 Cams SE103" BB Kit Zippers Cam Chain Tensioners SE Compensator Mustang Wide Touring Seat Stock Bars H. A backfire is a loud pop or bang sound that comes from your exhaust pipes when your motorcycle is running. The startup seems to be taking a little longer each time. 1. After it's up to operating temp and it has sat for 10 minutes or 2 hours. The only thing different is warmer weather. Plugs have consistantly had black soot build -up, and I haven't been able to see any air/vacuum leaks. Thinking that could be the "waste-fire" of the DIS burning off fuel, with a exhaust valve open on the exhaust stroke. Then start throwing money and parts at it like I did. At this point the engine will not come up on RPMs and the carb slide will start to rise and fall a small amount but rapidly. Caused all kinds of stuff to happen including the backfiring. no May 3, 2024 · Hear the roar of a fuel-injected Harley backfiring on startup—discover why and how to fix it for a smooth ride. If grounds aren't the problem, check regulator and coil. Oct 4, 2013 · SOURCE: 2002 Harley Ultra Classic backfires Sounds like the previous owner didn't get the cpu remapped, Take it to a Harley dealer and have him check the exhaust mapping on the cpu, Shouldn't cost much or if you want get them to fully service it so that way you will know were your at with it and will have a reference point to start with or service and maintenance reasons (and re-sale value Feb 8, 2019 · I'm having trouble with my 2001 FXD backfiring when I let off the throttle (the idle circuit?) It's running the stock Keihen carb. If your motorcycle is your Sep 15, 2022 · Motorcycle backfires are often misunderstood by riders and even mechanics. What is backfiring, you may ask? A backfire is a loud popping sound caused by uncombusted fuel in the exhaust pipe. The fix for a motorcycle backfire on deceleration involves tuning the slow-speed mix in the carburetor by means of the pilot (fuel) screw. There's no definitive rule, but once a year is a good start. Nov 27, 2014 · It is not your starter or ring gear! The problem is the engine compensator sprocket! The stock compensator sprocket is junk in the 96 ci engine and should be replaced with the SE version of the compensator sprocket. Also VERY hard to start hot. Apr 10, 2013 · After 1 month got the bike back, ran fine for a week, then one day it sputtered, backfired, shoots fire thru pipe. Jul 26, 2011 · I'm thinking its running lean. If your exhaust does not have baffles (also sometimes you can lose a baffle)or the bike is not tuned properly it could be the cause of the backfiring. Jun 9, 2014 · 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Jan 20, 2010 · 1973 FX frame chopped in the rear with rigid welded in place. ) After the bike is really warmed up (after approx 20 minutes of riding) most times it gets better…sometimes it doesn’t…and I can push the choke back in. Let’s explore each one in detail: 1. I use 93 octane gas and added new plugs to try fix the problem but still does it. If you're interested in learning more about motorcycles, check out this collection of kids Jan 6, 2008 · I have a 1994 Heritage Softail, with 80K miles, that is backfiring sometimes under throttle. Ill pull a plug tomorrow and see if its white. When it happens you will hear a popping or banging sound. Oct 30, 2019 · Spent 15 minutes attempting to start it at least 6 times, black smoke from rear cylinder exhaust and sputtering, pulling plug wires, resetting. Always spray the carb cleaner in reverse of the air and fuel circuits (if anything is in there, you want to blow it back out, not further in). starts right up. Runs fine once warmed up. Kick and Electric start 2 days ago · Quote from: Grayrider on April 10, 2016, 06:56:12 AM 99' Fatboy CV carb, What causes the bike to pop almost like a backfire when starting hot. I'm not really educated on motorcycle troubleshooting. On mine, I think that it used to leak fuel past the needle and seat on one of the carbs and would actually hydraulic one of the cylinders every once in a while, but it only did Oct 19, 2023 · A backfire can occur if the fuel backs up and fails to combust in time. Jan 1, 2014 · Check the mounting brackets for the exhaust as if loose this could cause some vibration. Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on? Customer: Tail pipe. Wow! That works great! I've been able to discern that the ticking is coming from the header to 3rd volume junction. It backfires during take off and keeps back firing until it warms up, once it warms up it goes away. Aftermarket exhaust systems can affect backfiring and Jan 20, 2025 · If you have an intake air leak, it makes the bike run lean. Oct 10, 2023 · Quote from: Hossamania on October 21, 2023, 07:31:55 AMMy carbed bike with a Thunderheader sometimes backfires so loud at startup that it sounds like a gunshot. changed plugs, filter and rebuilt S&S Shorty. Keep in kind that backfiring is often an indicator of a lean condition, especially when it occurs on decel. Rode maybe 10 minutes and bike died. It will start right back up whenever it dies. So my new-to-me carbureted 1200 Sportster with V&H pipes backfires on the intake side when I am even gently on the gas, which causes the bike to die each time it does so. What is the combustion source for the backfire? Jan 1, 2012 · Could a bad battery cause a backfire thru the carb? My battery is toast after only sitting for a few days. We answer that question in this article. Quick and easy. Kick and Electric start Jul 14, 2023 · Published: 14. Sounds like you have 2 different problems 1) the fuel backfire (intake). TIA Jun 10, 2004 · An easy way to check this is to start your bike up at night in the garage (with the door open) and turn off the lights. It is also extremely hard to start, hot or cold. Oct 19, 2023 · A motorcycle backfire is a loud, startling popping sound that comes from your exhaust pipe when unburned fuel ignites in the hot pipe or intake manifold. Jul 25, 2023 · What are common signs of Harley Davidson starter problems? Common signs indicating potential starter problems in your Harley Davidson motorcycle include the engine cranking slowly or failing to crank at all when attempting to start it. Try adding octane booster to see if it helps. On hot day 90+ days when i ride for a good distance and kill it to get gas or run in the store/bar for a bit and come back to start it up every once in a long time it will ack like the starter anit got enough power to kick the the motor over it always does but Jul 29, 2012 · Recently it started backfiring and sputtereing when cold, but 5-10min into the ride it runs fine with only slight hesitation when taking off. Often on cold starts, it would backfire through the throttle body, and it would be accompanied by a puff of black smoke through the AC. It has vance and hines pipes on it. They said the compression test looked good. My bike runs rough,slight backfire and close to stalling upon cold start up. Aug 16, 2024 · When troubleshooting backfiring problems, I always start by checking the fuel system. Is this a timing issue or a carb adjustment problem? Apr 20, 2006 · Backfire? I will get right to the point. com and read and or contact them and get a upgrade performance kit to make that carb work rightagain this is a good carb and a XL or BigTwin can make 80 + HP with it All CV carbs are way to lean period you might want to replace the rubber boot the carb is pushed into Rubber does get funky from heat and oil and Jan 24, 2005 · When kickstarting a '74 Shovel, no electric starter, it occasionally backfires though the carburator. May 26, 2022 · Start there. Cooler temps, engine (and it appears ONLY the rear head) backfires very badly for the 1st 15 minutes or say 20 miles. Aug 5, 2008 · I follow the 3 min, 3 mile warm up faithfully with my ride. Trouble codes point at BCM: B1210. Might be worth alowwing a short idle befor shut down. filter Aug 30, 2003 · It will sometimes backfire as it comes out of the hesitation too. make sure fuel filter and air filter is clean. It has fuel, spark & compression. However, after about 50-60 miles, it started sputtering again and losing power and I would have to downshift just to get the rpms up above 3k. See full list on motorandwheels. Not to mention, if you take it to dealer with a fuelpak and now backfiring through intake, they'll blame the fuelpak, inputs or installed parts. Initial Timing 14° Mechanical Advance Total Desired 32° Start RPM 1000 Peak RPM 3200 Vacuum Advance Total Desired 8° MAP Start 65 MAP End 50 3) Next, your Base Fuel Table kPa axis is set incorrectly. 14 votes, 13 comments. No throttle (unless it's pretty cold out). 041" wi brass washers to stop the exhaust pop & get it running OK. Just remember that if it’s a one nozzle pump, some 87 could be in the line before you start pumping and over time that can lead to decel pops too. Jun 28, 2022 · How to fix motorcycle backfire when decelerating. May 29, 2007 · It always starts just fine, but the idle RPM can vary (when it’s misbehaving) and it will sometimes cough through the air filter and die during idle. Backfire may happen when you start your motorcycle, accelerate, or decelerate. Jan 5, 2009 · SOURCE: Backfire when I get off the throttle and down shifting. Warmed the bike up and took off. By understanding the common causes, prepping your bike, and following cold weather starting tips, you can conquer the cold start issue. Please help!!! Dec 11, 2024 · The FLHTK is slow to start when it's summer and very hard to start in the winter. No ECM - tcdes. warmed it up, rode 5 mins backfiring, spitting fire etc. 6K views 2 replies 3 participants last post by candyman1340 Apr 29, 2021 Apr 4, 2015 · OEM Parts Finder Granite State Harley-Davidson Lebanon, NH (603) 448-4664 You may not need a rebuild kit, but it is a good thing to always have one on hand just in case you need to replace something. Jul 12, 2010 · Had the same thing happening to my 07 rkc. It happens as soon as the bike warms up even a little bit. As some have said, running straight pipes on the newer motors can cause this because of the tight specs. Harley Sputtering At Low RPM. I've read a few posts here and many have a " backfire" associated. Eventually had to go to 195 main/50 pilot (OEM is 190/45) & raise the OEM needle 0. Is this usual for this year Harley. 24 Have you ever cruised down the road on your motorcycle and heard a sudden pop sound, almost like a gunshot? Well, that's your motorcycle backfiring. ft. Initially the carb fires were exciting, now just irritating. Oct 9, 2003 · Small backfire on startup. Scares the hell out of anyone around. We unloaded the bike into my unheated garage and I tried to start the bike. I just tried Max's rubber hose to the ear thing. 018 with the timing mark visible in window. Come join the discussion about performance, modifications, troubleshooting, builds, maintenance, classifieds and more! Oct 6, 2005 · Backfire is, generally caused by to much advance, and an after fire is to rich for the timing, or a near flooded condition. 1974 Suzuki GT750 Lemans (Water Buffalo) Apr 7, 2018 · Check the battery volts with the engine off, should be 12. Hello, my 2001 ZX9r used to do it too, but I found that if I turned off the fuel petcock before parking it overnight, it would not backfire. Try this when starting your bike when cold. I have set the point gap at 0. S&S super E carb, Andrew B grind cam. It has a Bassani Road Rage Exhaust in place of the stock exhaust. Hi readers! I refer to the original question regarding the backfire on take off after idle and when cold. My '04 Defender did both when I got it. Had stator issues so had to get a jump to get home. ” “My 2001 [Harley-Davidson] Road King (fuel injected) will run just fine for about 3-4 mi. No touching the throttle and you really want to wait on the lights as the ECM is booting up. A motorcycle exhaust backfire is an annoying and potentially dangerous problem to have. This backfire is intended to occur in Harley’s combustion chamber. Last edited: Aug 22, 2008 Feb 9, 2020 · Removed the fuse before removing battery, didnt short the terminals, no staging has been done, only a forward facing heavy breather. Spray some WD-40 around the intake manifold at the head flanges with the engine idling, if the idle changes at all there's an intake leak. Open choke to full, turn throttle fully twice and release to idle, the hit then starter. The combustible engine is designed to burn fuel and air in a combustion chamber by drawing air through the intake valve while fuel injectors spray gas into the same chamber. Got about a 500-1000 yards from the house and the bike started to stumble backfire with no throttle response and died. Had to leave for my 45-mile drive to my DoD job. Oct 14, 2013 · Ok I have 2001 rd glide with a 103 se FI ,httc heads, true duals vance exhaust. Could be that simple. Now it won't start and back fires as I'm trying to start. " This practice is mainly employed in manual transmissions and is done to synchronize the speed of the engine with the speed of the lower gear, promoting smoother and more controlled downshifts. It seems to clear up at higher rpm's, 4k rpm and up. Once we replaced it. 190. Acceleration is good and recent fuel economy check on round trip to Rolling Thunder was 47+ mpg. Apr 28, 2010 · A forum community dedicated to all Harley-Davidson model owners and enthusiasts. Check for any exhaust leaks or issues with the fuel system. Oct 16, 2024 · Was still getting some back fires out of the carb but kicked over pretty easy multiple times today after first start. The pressure may be fine while the pump/engine is running but during starting, a loss of pressure AFTER the pump turns off will cause bad starts. Jun 26, 2018 · 1995 Sportster 883 Custom. The engine seams to run very hot. Harley's vibrate more than Japanese bikes. Press starter button until bike fires up. Many people think a backfire is simply an explosion in the exhaust system, but this isn't always the case. Oil temp dipstick is at 180-200 riding in the city even though it's hot and humid in the 90's right now. It comes and goes. If fairly warm outside, maybe a half roll of throttle. Most often, it will roll over a few too many times then backfire. Jun 5, 2017 · I had a 03 RoadKing that once in awhile would pop on cold start up. Got a open loop tune a couple of months ago (over 1000 miles ago) and have not had any problems. I'm thinking crank sensor . I have found that almost all of the time any backfire when you get off the gas is due to an air leak. Sep 4, 2008 · Update: On start up this morning, had a small backfire through the exhaust. Behind the round cover on the cam case. (This is with the choke all the way out. After it has been run, it's OK for the rest of the day. Initial startup can be a pain because once in a while, it will just start right up (maybe 1/10 times). I put the replacements on but put the umbrella on the wrong hole and I was getting a wet oily air filter and would get backfire every now and then. Feb 9, 2023 · The day I picked the bike up it was around 20-25 degrees and windy. Jul 28, 2009 · I have OEM HD circuit breakers in both my 49 and 58 pans. Iv had air cooled bikes but this is my 1st Harley. Harley is pretty steep on the labor! 1hr to install the non security TSSM and 1. Sep 14, 2021 · Both the replacement part and the TSSM without the security built in is on back order. (no start). Last week when i was on the home stretch it started bogging out and popping very loudly and I barely got it home by riding the clutch and giving it slight throttle. 23 Updated: 19. In this case, the bike may run smoothly at higher RPMs, but once the RPM drops, the bike starts to sputter. Dec 4, 2015 · It had a backfire every now and then. blow compressed air through all openings and reassemble. Sometimes it will backfire really bad when I hit the throttle and other times it will act just fine. Recently, when starting (random doesn't happen with every start) awful grinding sound culminating with backfire through the air cleaner. Make sure you check for air leaks at the manifold to head joints as well as the throttle body to manifold, and don't forget to make sure the rubber cap is still installed on the vacuum tube on top of the throttle body. Once this was fixed and the carb retuned it cleared all Feb 18, 2004 · 05 Screamin eagle E-glide 114" all bore motor '08 Night Rod Special, Tab exhaust,topless,Dobeck Fueler Coast "wailea" hot tub 2 3hp pumps, 50 sq. Since then I have had no more issues with backfiring. any ideas on why? I have 40 K miles on her, but have changed the spark plugs about 6 months ago. Jul 7, 2021 · To start I have a 90 rt with a 111 s&s twincam, the harness and ecm is out of an 2004 flhtsce. Lately the starter will have a hesitation when I start it first thing that day. Oct 20, 2008 · Just a thought. Jan 22, 2024 · Increasing the engine RPM (revolutions per minute) while downshifting is a technique known as "rev-matching" or "blipping the throttle. Only other time it ever backfires is occasionally on decel, but not bad even then, mostly just the usual "popping". I need help. 8. When I removed the breather, cleaned the throttle body, and changed the sensor, there was moister in the sensor from riding in the rain without a rain sock on the filter. true. Early Detection: Recognizing symptoms like erratic gauge readings, dimming lights, or electrical malfunctions can indicate a faulty voltage regulator, prompting timely maintenance or Jun 8, 2023 · Hard to start cold but a short squirt of starting fluid usually does the trick. I suggest you check your circuit breaker top bushing for slop,check and charge your battery,clean the battery terminals(be SURE you have a good ground connection) buy a good set of points and a good condensor(OEM if you can find any)Make sure all your surfaces in May 14, 2014 · So I have a 2012 Road Glide and as of recent ( no changes to bike), the bike will backfire through the air filter on startup occasionally. The cheapest cure is usually the most time consuming. Feb 5, 2016 · If it's backfiring through intake STOCK, you need to fix THAT issue first. I checked for intake and exhaust leaks, all ok. . Recently I went to start her and she was hard starting. Again on start up. backfire on hot start up February 22, 2013, 07:36:25 AM every once in a while i'll hit the button on my 02 xl1200c with v&h straight shots and get a loud backfire. Customer: Bike backfires once at start up then won't start. The engine cranks but won"t start. May 21, 2024 · Common Causes of Harley Backfiring. Two of the most common scenarios is when you find your Harley sputtering at low RPM and when your Harley sputters on acceleration. May 22, 2012 · I have an 02 Duece, Screaming Eagle heads, power command, 208 cam, large bore kit, 30k miles. The black spark plug with deposits and black fowling all over it is in the rear cylinder. Apr 3, 2023 · Many Harley riders love to customize their motorcycles, and the exhaust system is a popular place to start. Pwr cmd IIIusb I just did coast to coast ride and after i got back 8k plus miles it started to misfire pop out intake at most low speeds and when feathering throttle not when hard accelerating? and when idling it backfires alot and runs really bad? Aug 8, 2015 · My other half has an 08 HD DYNA Low Rider and we cannot figure out what is wrong with it. Mar 15, 2007 · The startup drill for an EFI is turn the key on and wait for the appropriate lights to go out. 195 main jet. Neither wof the two worked. Gas stations don’t explain it well, but happens a lot. If the running improves, steps can be taken to give it more timing if it needs it. While riding bike, exhaust backfires/pops when letting off of the throttle in any gear Hey everyone, I have a 2006 Fat Boy EFI. Has good spark and compression, fuel sucks on to hand if if I cover carb when cranking. Whether you're experiencing motorcycle backfires on deceleration, acceleration, or braking, it's important to understand the root cause and how you can fix the problem. Jul 31, 2021 · A Harley CV carb’s float level is changed by carefully twisting the metallic tab that emerges from the float and rests on the float needle plunger. When these elements encounter problems, your Harley's performance can suffer, leading to annoying backfires. After work, started bike and it did a half start and died, started up (hesitantly) 2ND time. The starter thing sounds like somthin i might want to look into as well when i get it tuned. Discussion on V-Twin Harley Davidson motorcycles including Dyna, Electra Glide, Softail Dec 31, 2016 · Usually end up rolling the bike to the side of the road and cranking on it to get started. Kind of a rude wakeup for early morning departures. May 10, 2023 · I have a wide glide that is backfiring and popping when I accelerate. Mar 10, 2012 · your 1st mistake is letting a Harley Dealer touch your bike! Go to CV Performance. What I noticed was that sometimes right befor I shut the engine off if I didn't allow a couple seconds of idle time the following morning The engine would often do the pop / slight backfire at first start. Jan 31, 2018 · Well you sure shouldn't be required to pay for a 'tune' IMO on an in warranty H-D. Nov 13, 2007 · RE Backfire upon start up. Could this have been the issue with it back firing I have had all summer. I've got a 95 roadking, this spring it started running irratically,even just dying a couple times after running good. no backfire. I don't think this is normal at least not for my bike, any ideas or steps I should take to TS this? Jun 18, 2012 · 2003 Road King 98CI Big Bore Kit Revolution Performance, S&S Heads, S&S Easy Start Gear Drive 585 Cams, S&S Roller Rockers, 07 Oil Pump, Speeds Performance Cam Support Plate, S&S Adjustable Pushrods, D&D Fat Cat exhaust 2 to 1, Power Commander V, Auto Tune, Energy One Clutch, Aug 12, 2021 · Hey all i got a 1981 Harley davidson wide glide that was running fine up until 2 weeks ago started backfiring, took carb apart put new seals on manifold, and put it back together backfiring stopped, but bike wont idle now and it leaked an excessive amount of oil on 3 failed start attempts 10-20 drops. I dont know if po had it re-jetted or not. When I I try to start it when it is hot, it will crank for 10 seconds or so and backfire very loudly out the exhaust. Just that darned cold start. Why is my motorcycle backfiring? Aug 3, 2010 · Thanks to both of yall for the quik reply. Show Less . On cold startup in mornings, it will turn over once, backfire, (thru exhaust) and then starts and runs fine. Dec 11, 2023 · A Harley Davidson motorcycle cutting out and backfiring can be caused by a variety of issues. This can occur on any model, any carburetor, but seems to happen most often with the stock CV Keihin carburetors used on the newer (90 up) Big Twins and Sportster models. Additionally Jun 21, 2013 · Yea, coughing through the carb & popping through the exhaust 2 different things. I purchased this project not long ago and finally was ready for my first voyage. Mar 13, 2012 · hard to start then backfires through carb seems to idle fine once running full choke then when you rev engine - Harley Davidson 1993 XLH Sportster 883 Hugger question Apr 12, 2017 · 2003 Road King, carbureted won't start. Bike runs perfect other than that. It will occasionally sputter/backfire through the exhaust. The last time I rode was in October. Since moving up here it has developed a back fire issue. Keeping up with regular maintenance can help prevent excessive backfiring. She's still doing the same thing. I'm leaning, ( excuse the pun), on a lean condition. Changed the spark plugs, got a new battery, changed the key fob battery, changed the crank position sensor, checked all fuses and still wont start. 0 cores). Bit of an odd one for me. If the engine is not getting enough fuel during startup, it can lead to backfire through the carb. You might also hear a clicking sound when turning the key, but the engine doesn’t start. Jul 20, 2008 · 1997 Road King, stock engine, 2-into-1 DG exhaust, HD airbox kit, rejetted original carb, 24,000 miles on bike. It will start just like a 1930's 6 volt car. fixed the problem. no your totally wrong the backfire is bcause if u juice the throttle there is excess fule in the cylinders witch give it no where to go so it ignights and creates a backfire witch is not necessarly bad. When you give it any throttle the accelerator pump will shoot the steam of fuel, the slide starts to rise and the RPM starts to come up. It starts fine when it is cold. When it comes to engine backfire through the intake, there are several key culprits that can ignite this explosive phenomenon. Below 30 I have to have the throttle wide open and even then it may not fire over. Dec 15, 2013 · I have attached to photos to this thread. Doesn't do it when cold only on restart and hot engine! Jul 22, 2014 · Since then we have moved to alaska. No issues there. An improper fuel-air mixture is one of the primary reasons behind engine backfire through Jul 26, 2008 · backfire on take off after idle and when cold. If not, I'm going with a lean setting. After we got going on the highway, it got better and only sporadically gave me problems. May 13, 2016 · Odd that it's not setting a code, though. Where should I go from here? Seems like timing might need to be a little further advanced (based on the backfires)? Try moving the mark a little further toward center of the window and timing again, or adjust from the ignition May 25, 2004 · Just a thought here, I had some serious problems with backfiring through the tailpipe and I mean shooting about a 3 inch blue and white flame out the back end. I took the top cover off and switched the umbrella to it,s proper position then re installed the cover. You will be able to see the exhaust leaks where the pipes meet the engine. also you did not mention the Jan 29, 2020 · I have a 1998 Fatboy. Again, ran fine. If the pathways of the jets get clogged with debris or bad fuel, the jet backs up into the carburetor and your acceleration delays. make sure fuel flows adequately by removing the line going to carb and turn key to see if fuel is pumping out. Check out the table below for a breakdown of common culprits causing your Mar 28, 2002 · Every single time one of those three were started in the cold, below 55F, they will run very rough, and occasionally give a backfire when starting up. It can hurt your ears if you’re in a confined space, or could start a fire as some backfires even emit flames. If pretty cold outside, a couple of half rolls on the throttle. 3 weeks. Replaced ignition sensor plate, new plugs, and still nothing. Kyle • 2022 Low Rider El Diablo (FXRST) [1284/1500] • 1997 Softail Custom (FXSTC) Harley Davidson Forums. Does anyone have any ideas at all? Nov 2, 2022 · 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Mar 7, 2018 · 2007 mechanically stock Road King with 50,000 miles and impeccable service record. I'm trying to understand how this is happening. This can be in eather the intake or the exhaust. After that, it would start up fine. It’s an anomaly. Stock size main jet is a . Common causes of Harley backfiring often stem from issues related to fuel delivery, exhaust systems, and engine components. Jul 2, 2024 · In conclusion, tackling a hard-to-start Harley Davidson in cold weather is like navigating a frozen road – challenging but manageable with the right tools and know-how. What Could Make My Harley Davidson Backfire? A small explosion in the exhaust or intake causes Harley Davidson to backfire. the only way to backfire out the intake is to have it fire when the intake vaulve is open. SO far I have drained the tank and ran seefoam through it. Mar 22, 2021 · What you are hearing is your bike backfiring on you. Sep 22, 2009 · 1973 FX frame chopped in the rear with rigid welded in place. Oct 28, 2024 · What can cause the 2022 Harley Sportster Iron xl883n to lack acceleration and backfire after 5-10 min of riding? It used to start glitching after about an hour of riding but that time frame seemed to dimish. Loud bang. 1996 FXDS-CONV S&S E. Backfiring through the A/C. Placing other parts on it is only going to cloud an otherwise, possible unrelated issue. We're trying to solve a backfire and not tune for performance. The OS sensor was recently replaced. i checked for exhaust leaks couldnt find any. Jun 26, 2024 · Diagnosing Hot Start Issues: Checking the voltage regulator’s functionality is essential when troubleshooting hot start problems in Harley Davidson motorcycles. Jan 22, 2024 · When I start it cold, the RPM stays at around 3000 for about 5 seconds (+/-). Bottom end is 58 panhead topped with 66 shovelhead. Also some vibration is the nature of the beast. Aug 30, 2015 · need to remove and clean the carburetor by hand with carburetor cleaner. At its worst on the road it coughs through the air intake and backfires as soon as any load is placed on the engine. I would not consider changing them over to any sort of electronic system. Oct 23, 2022 · I have a 2007 Sportster XL custom. Unfortunately I wanted to show my brother (who helped me pick the bike up) how nice the V&H slip-on's sounded. There was no riding on one cylinder. Oct 10, 2020 · 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Sep 25, 2008 · The Scoot: 95 FLH-P, with High Compression Evo, Carbed Here's the symptoms. New plugs with correct gap and new wires, still no Jun 27, 2007 · Popping & Backfire The 05's, 06's, 07's pop & backfire on decell. NOTE: Even though your engine might crank over and seem like "it should start”, if the output of the battery is lower than what is necessary for the module to function, it will struggle to start. I have to crack the throttle a little when I start between 50 and 30. 8 volts > static. Plugs are white. He has changed the stator, crank shaft position sensor, changed battery, ground cable, spark plugs and wires, coil, etc. it seems to only backfire at low RPMs if I am reving it coming to a stop sign. 1974 Suzuki GT750 Lemans (Water Buffalo) Ok. Backfiring can happen due to unburned fuel igniting in the exhaust system. When it's experiencing issues, if I turn it off, it's difficult to restart; it takes three times longer than normal. Apr 13, 2012 · drinking in the "pop". Improper Fuel-Air Mixture. Never did it before. So, not sure if it's a bad gas issue, or maybe the carb needs to be pulled and cleaned, or Bike has 32K miles Sent from my iPad using the HDBitchin Harley Forum mobile app Jul 7, 2008 · problem I'm having, so here goes. Is there something going on Jun 11, 2019 · Symptoms include backfiring, loads of smoke from the right exhaust, and some from behind the air intake when pressing the starter, and immediate stall when the starter is released. Screaming Eagle ignition,V&H Short shots. Posted on Sep 15, 2009 This issue only started after I put on a RSD AC and the Rinehart 4" slip ons (previously had stock hi flo Ventilator AC and Fullsac 2. Twice yesterday, once on first start up then later in the day when fully warmed after a 30 minute stop. 2) backfire after closing the throttle at speed (exhaust pipe). Let it sit 3 days it will then start right up. Bike always starts after a couple two or three try's and runs perfectly with no issues. May 22, 2011 · hello, i still cant figure this out. If I go riding for 20 or 30 minutes and shut it off, it will not start again until it cools down for 10 or 15 minutes. Mar 9, 2023 · After it warms up, it will cut out, backfire, and just die a lot while riding down the road– –Engine backfiring and stalling after it gets warm is a symptom of a failing cam position sensor (ignition pickup). (1998 FXSTS) Lately and it's happening more and more, I am getting backfires on acceleration (only after I close (push in) the enrichener), on deceleration and at times just in normal cruising. Pulled over, called for a ride. Jun 25, 2024 · If you notice your Harley backfiring during deceleration, fuel mixture is one potential cause for it. 1974 Suzuki GT750 Lemans (Water Buffalo) Jan 6, 2004 · One of the most common problems that customers complain about is the spit-cough-pop from the carburetor as a Harley goes from idle to ¼ throttle. In carbureted engines, a common cause of backfiring is a lean air-fuel mixture. Maybe if someone could just explain how too much air and not enough fuel in the front end (lean condition, all fuel is burnt) causes the popping on the back end, it would help educate me and maybe others, because this seems to be an ongoing debate and it seems odd that there isn't agreement on something like that. I had a broken intake flange. Oct 21, 2003 · I have been having trouble with my bike starting when it is hot. It usually happens in the morning, so cold starts. I E-mailed Power Commander tech and they said maybe a leaky injector allowing fuel to pool in the exhaust overnight. with a . Jan 6, 2022 · When cleaning the carb, if it's the stock Harley CV40 carb, you need to remove all the gaskets and rubber from it, to include the o-ring inside the afr adjustment screw pack. Mar 20, 2022 · I bought the bike when it was 9 years old with 19,077 miles on it and that ground was a gremlin I didn't find until over a year later after 3 shops—2 of them Harley, and 2 of them worked on it twice—didn't find it. Oct 19, 2023 · Same backfiring is common and normal even on a healthy, finely-tuned machine. It starts right up, no backfires. It pops out exhaust allot on decell. Tried to jump it again and wouldn't start, just cranks. The TSSM from start to finish takes about 10 minutes to pull out and put in. Still, chances are if your bike is frequently backfiring on startup, it’s backfiring while you’re roasting the road. Lately I noticed engine backfires thru exhaust, more than normal, at low rpm's and on deceleration. the bike starts as advertised but will on occasion back fire scaring the crap out of my self and every one around me. i sometimes get a backfire when i start my bike after its warmed up. Other point> In idle, when the RPM is at 1500, this is the same moment as the failure I tried using fresh, premium gas with Seafoam. So what exactly did you end up choosing as the set up? I have the same set up, 07 nightster, lowbrows 2-1 exhaust, high flow intake, fp3, and all the same issues. Apr 28, 2021 · 1990 flhtc backfire hard start Jump to Latest 1. The acceleration backfire is coming from the carb and rarely is heard in the pipes. When trying to start, it has a loud backfire through the exhaust, sounds like a gunshot. ), can seperate into two different, non-combustable forms of alchohol. Doesn't have any codes that I can retrieve, and the check engine light stays off after initial light check. Todays fuel holds ethynol, which when combined with time and direct venting to the atmospere, ( bike, boats, lawnmowers,etc. 5hr with the security (1hr install and . Disassemble the carb and clean it out with carb cleaner. There was a short from the rear coil terminal and the wire. Sep 25, 2006 · You may need to adjust your air /fuel rate ,and you can find 1000's of threads on the subject in this forum,I personally put a DFO/TFI module on my bike to do this ,the PCBIII and the SERT are just some of the others on the market,I would start looking for intake and exhaust leaks first if you didn't change anything from before the popping,If you changed air cleaner,exhaust ,you will need to May 8, 2008 · Sputtering, missing, backfiring, have almost no power. You do not hear this on a bike with a stock exhaust due to baffling of the exhaust. Did this backfire problem just start or has it been ongoing ? One thing I would check first is for intake seal leaks. Went to start up heather (my 48) and it pausedturned over twice then died and a small backfire or engine pop happened? When it happened a small amount of bright blue smoke came out the air filter intake. Very prone to backfiring through the carb. You’re probably wondering why your motorcycle is backfiring on startup in the first place. When I first installed the exhaust I had the same difficulty, backfiring when you let off the Nov 19, 2012 · The Problem: the bike will start and idle perfectly, even for extended periods. 73 4spd trans. Water could have gotten into the back of the fuse block shorting the start relay which causes the IAC to stay energized after the ignition is turned off and that'll drain the battery when the bike is parked. When I recently tore down and built the bike back up I corrected this leak and the backfiring at speed when closing the throttle stopped. 5ht for programming). The "normal" spark plug (greyish/brown/white color) is in the front cylinder. Also check the intake for leaks with wd40 or carb cleaner while its running. Something loose? I took it to both of the Harley Dealers in my area. Oil Cooler 1990's LeatherWorks inc Saddle Bags with HD Deluxe modified guards H-D Windshield Thunder Max A/T 2005 S E Tour Pack Progressive Shocks & fork Mono Over the past month i noticed right after i start it up even after already riding it, it will backfire more often than in the past. Sep 6, 2022 · ‍ What Is A Combustible Engine Backfire? When a Harley or any motorcycle backfires, it’s more than a loud, explosive noise. Mar 25, 2012 · I got the backfire at speed when I would close the throttle. 9M posts 108K members May 8, 2024 · and now it wont start. Bike idles fine, runs great, and otherwise has no issues. Feb 7, 2024 · Unraveling the Causes of Engine Backfire through the Intake. About 3-4 minutes of riding it was fine. If I start off heavy with the throttle it will rip through the gears no problem. This is dangerous because not only can this sound damage your ears, it can possibly start a fire, as some backfires emit flames from the exhaust pipes. I used an enclosed U-Haul to get it home. Was it too much fuel and excess burnt off or oil in the cylinder head than burnt up ok ignition? Apr 3, 2003 · 1999-2000 Harley-Davidson FLT Motorcycles Recalled Washington, DC (SafetyAlerts) - The National Highway Traffic Safety Administration has published the recall of certain 1999-2000 Harley-Davidson FLT motorcycles, manufactured between May 1997 - October 1999 because the bank sensor angle system can malfunction, causing the engine to stall or quit unexpectedly when riding. D. Could be time to start disconnecting, spraying contact cleanier and checking all the EFI conmections for corrosion, including the main harness plug at the ECU. Backfires happen on most bikes every once in a while, but if your motorcycle is backfiring on a regular basis, it indicates a problem somewhere in your air, fuel, or exhaust systems. It only a partial throttle. May 23, 2009 · Next, every bike needs proper jetting, even on a stock evo, i run a 46 to 47 slow jet depending on altitude, secondly, I recommend changing the stock needle, some people use 89 sporster needles, i use bob woods kt1 needles in all my bikes, and then the main should fall between 180-190 main, depending on altitude. Let me start by saying that I am a motor mechanic by trade (cars) and I own a Honda cruiser. Any ideas as to what it could be? I was told it could be the fuel air mixture so I adjusted that and also changed out the intake to carburetor seal. if you have a fuel solenoid; just remove it from the carburetor and plug it back in and turn key on once and Jul 7, 2024 · Is It Normal for My Harley to Backfire? Yes, it's normal for your Harley to backfire occasionally. Could be timming. It will most likely start up easier the first time this way. rldei xcd duazufu fop pbzxdk tzvtj zhjpzm laz qxhf bsriso