Sportster misfire I have a 97 1200 sportster. Other Reasons a Harley Might Backfire Include: Failing fuel pumps Incompatible exhaust Low fuel pressure Unbalanced air-to-fuel ratio Exhaust leak Fuel filters are blocked. Posts Latest Activity Photos Page of 3 Filter Aug 24, 2010 · The intermittent misfire on my '03 Ultra ended up being a faulty FI wire. Few weeks back I was out riding and my carbs overflow started to dump fuel due to the float. replaced the line but the front cylinder still not firing. The bike has V&H oval slip-ons, K&N breather and stage 1 Feb 19, 2016 · Harley Davidson Sportster: Engine Performance Diagnostic Guide It takes time and effort to maintain engine performance at like-new condition as the miles increase. 256/. At first, I thought I had gotten some bad gas so I drained the tank and filled it with fresh gas. When I say I lose acceleration I mean it’s missing/not firing properly. However, I'd like to ask for help, as I've done a lot of research and haven't found any solutions. Check for weak or inconsistent spark at high RPMs, as ignition breakup often occurs above 5500 RPM. Warm Sportster/Buell Model:Sportster 1200 Sportster/Buell Year:1999 #10 25 August 2007, 18:29 Just checked the wire under the head light and all seems ok, the cheapest option is to replace the coil as they are about £40 over here whereas the module is about £152 Moved On Senior Master Custom Bike Builder Join Date:Nov 2004 Posts:6459 #11 25 August Weird sound misfire? Aug 23, 2025 · Faulty spark plugs can cause hard starting, rough idling, decreased fuel efficiency, misfires, and poor engine performance. 2007 xl 1200 HD Sportster misfires 2007 HD xl 1200 misfires and the motor runs rough , backfiring and it kinda - Harley Davidson XL 1200 C Sportster Custom question May 9, 2013 · Well, that's not exactly correct. Jul 18, 2023 · Rev up your ride with Harley Davidson 1200 Sportster Common Problems ! Explore tips to tackle common problems for a flawless journey. It doesn't seem to Learn the key Harley coil symptoms like stalling, misfiring, and backfiring. Can't Jul 24, 2008 · I am Cruising down the road its flat about 45 in 4th gear the engine doesn't seem to be laboring, It feels like there is a slight misfire/stumble ,5thgear 50-55 same thing only more noticeable. This only happens at certain rpm's (no tachometer on bike) and higher, usually at speeds of 60mph or greater. They provide Maybe those aftermarket pipes have thrown the computer off. Hi there my 89 1200 started making a ticking noise along with a misfire i have replaced plugs wires coil electronic pick-up even the oil! Tore the bike down checked all the lifters,pushrods,cams,valves and everything looks good? Had a no spark issue, traced down everything, and nothing seemed to work. Dec 20, 2012 · Now that I have the top end all back together and have had the opportunity to ride it for a short distance on two occasions I pulled the plugs when readjusting the pushrods and the back plug was fouled with a soft black fuzzy carbon deposit. I thought I could figure this out Harley Davidson Softail Misfire refers to when the Harley Softail’s engine runs but fails to ignite the fuel correctly. Once it warms up, when I give it throttle, it misfires badly thru both cyls. It can hurt your ears if you’re in a confined space, or could start a fire as some backfires even emit flames. As you all know I have a 2000 883 . Dirty/watery fuel (transparent fuel line, and using high grade premium fuel), points going bad (looked at points, no pitting). (I checked it against another wire that doesn't Jun 18, 2024 · Harley Davidson 1200 Sportster often faces issues with oil leaks and electrical problems. I bought it used at an auction so really dont know its history. Do I have to rebuild the engine? 2014 Harley-Davidson Sportster Engine Misfire Information herein pertains to 2014 Harley-Davidson Sportster motorcycles that start but run irregularly or misses on XL 883 SuperLow, XL Nov 19, 2012 · I am Helping a friend who traded for an 02 883. My bike is a 1997 Dyna, it has just devloped a misfire and only runs on one cylinder if I rev it out over 4000 revs. Intermittent misfires at low revs, especially when hot, often stem from faulty ignition coils or spark plugs. Aug 7, 2022 · In this article, we are telling you about the most common Harley Davidson 1200 Sportster issues and recommended fixes. They told him the carb needed to be rejetted because it had Screaming I have a misfire on a 90 sportster-1200 conversion,new plugs mild andrews cams [490 lift] supertrapp pipe,rejetted carb - Have you had an issue where your Harley started to Misfire? Check out our Member Q&A for a solution to the problem. Despite new plugs, wires, and a rebuilt carb, check the Dyna S ignition module for proper operation. So at the end of last season my bike started to misfire at 60+ mph. Stock everything except straight pipes. If you are experiencing no-starts, misfires, or poor acceleration, this article may help. For discussing problems about your Sportster motorcycle that don't fit anywhere else. jpcycles. The 2014 Harley-Davidson Sportster motorcycle general troubleshooting guide list possible causes and actions needed to fix a Sportster that starts but runs irregularly or misses. 2007 xl 1200 HD Sportster misfires 2007 HD xl 1200 misfires and the motor runs rough , backfiring and it kinda - Harley Davidson XL 1200 C Sportster Custom question Weird sound misfire? Aug 4, 2018 · My '86 EVO FXR, developed a problem on a ride last weekend. It would back fire through the carb and it seemed like the rear cylinder would cut out. Managed to make it home running on what felt like 1 cylinder on and off. When running down the road at a steady speed and fairly low RPM, say around 2500, every once in a while the bike will have a very sudden and slight misfire. A couple of weeks ago I went to go for a ride with my girlfriend. When it's warmed up, (normal temperature of operating -- After Feb 14, 2024 · Engine Misfires Engine misfires are a common problem that Harley Davidson 1200 Sportster owners may encounter. Too much throttle and it stalls altogether. When a MAP sensor Jun 8, 2014 · why would my 1996 sportster misfire on rear cylinder ? - Harley Davidson XL 1200 C Sportster Custom question Mar 21, 2012 · 2006 Road King fuel injected, no modifications. Low-speed backfire and misfire after high-speed runs often indicate ignition timing or fuel delivery issues. As per the owners manual, cool/cold start full enrichener for 2 miles, then 1/2 enrichener for 2 miles, then off. Was going to go through the top end anyway and I found the intake gasket on the rear cylinder burnt through, creating a gasket thick sized intake leak which must have been leaning Sep 9, 2009 · Does anyone know what may be making my 05 Sportster 1200 Custom misfire in the rear cylinder? It pops while idling out of the rear pipe. Bike not riden much over the past year. Check ignition timing and ensure carburetor rejetting matches cam specs. some times on downshifting from 3-2 then rolling on the throttle. Finally after digging and digging in the internet, and chasing a wiring diagram for Oct 31, 2023 · Say no more to those dastardly Harley Davidson sputtering issues! In this comprehensive overview, a seasoned mechanic walks you through it all. 8mm Wires, Tach Jan 4, 2014 · I have a 2006 HD Sportster 883 that backfires or hiccups through the carb when you first give it some gas. This can be in the form of a misfire when starting the engine or backfiring. Jul 6, 2011 · the misfire or sputter occurs at random. Inspect ignition coils for cracks or heat damage. We will explore the problems and potential fixes for your Harley. When I looked at it the First time the Carb was gummed up. long story short i ended up finding two holes in the tank fuel line. Misfires Misfires are one of the most common and noticeable symptoms of a faulty Harley MAP sensor. Misfires can occur when the engine fails to ignite the fuel-air mixture properly, resulting in a loss of power and performance. It starts fine. May 16, 2009 · Bought a 2007 Sportster 1200 Classic, 13k miles, bike ran good but developed a miss at a steady speed, around mid throttle range. Now it will idle fine but mid range is toast. It is intermittently missing on the rear cylinder Shop Ignition Coils - https://www. Only at low rpms though. May 1, 2009 · Hi guys, I got a problem that is kicking my butt and wanted your expert opinions. Examine wiring harnesses for corrosion or loose connections. Good spark at the points. Experiencing issues with your Harley refusing to start can be A backfire is a loud pop or bang sound that comes from your exhaust pipes when your motorcycle is running. Mar 1, 2023 · Over-revved as in “hit the rev limiter”. One of the Jan 22, 2024 · I'm new around here, and I'm still getting the hang of how to introduce myself better. I've done a lot of reading and I've been messing with my carb. Air Kit, S. Customer: My 05 Harley Sportster 1200 misfires when it is running at lower rpms after I run it for about 20 minutes. Jun 22, 2017 · I have 1977 Ironhead XLH it idles fine but getting up to speed it cuts out and backfires out the carb, spits and sputters. If felt like it was choking out and would load up or miss but only at highway speeds. Hard throttle not too bad. She runs like a bat outta hell but seems to cough every now and again through the carb . In this article, we’re going to delve into this topic and uncover the telltale signs that your spark plug may be on the fritz. But, no change. She seems to idle all right, but more than 1/8 Sep 25, 2020 · Hello, I recently bought a 2017 Sportster Iron 883 and but about 2500 miles on it in the span of a couple of months. But this will apply to any motorcycle, atv, dirtbike, car Dec 8, 2011 · For discussing problems about your Sportster motorcycle that don't fit anywhere else. She has been hard to start, requiring continuous kicks to start even after warmup and riding. Owners also report frequent battery drainage. Need Help! 04 1200 Sportster is backfiring/misfiring on acceleration! I have a 04 Sporty and it recently started backfiring/popping (gunshot sounds) when accelerating. I recently purchased a 2002 EGlide EFI (FLHTCI). I have a Street Glide Special, 2021 M8 114. Harley Davidson Sportster Engine Problems by Symptom Get to the root of your engine's leaks, noises, misfires, and performance issues with our step-by-step diagnostics. It ran great prior to any engine modifications but since the modifications I occasionally get a single misfire upon takeoff when the motor is cold. checked spark, plugs did a compression May 11, 2024 · For 2007 and above SportstersHey all. Owners of the Sportster 1200 have reported various problems, ranging from electrical malfunctions to the Mar 23, 2012 · OK – thought I might be able to trouble shoot this by reading all the other threads I could find on it, but I am not sure my problem fits exactly with the others I've looked at. Floated out. com/motorcycle-ignition-coils-and-covers?utm_source=youtube&utm_medium=description&utm_campaign=How_to_Test_a_Har Jul 18, 2020 · I have a 2001 Ultra Classic with E. Why is my motorcycle backfiring? A motorcycle backfire happens because of the presence Jul 31, 2013 · Sportster randomly misfiring and dying. As soon as you give it throttle it boggs On my 71 ironhead, kickstart only. This winter, I redid the top end and got a different manifold and a CV carb. Sep 14, 2021 · 2014 sportster misfire Jump to Latest 2. It’s not really a single cylinder problem. Check the ignition coil for cracks or damage and test its resistance with a multimeter. 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. It Customer: I just bought a 2006 XL1200C sportster with 788 mi. Ive done a different air filter and my efi compensated, I don’t have personal experience with aftermarket pipes. I replaced my rear cylinder head cause I couldn’t get a broken exhaust bolt out of it. May 8, 2013 · Hey guys, First off the bike is an 06 883 custom. It occurs when the engine fails to ignite the fuel mixture injected into its cylinders, resulting in inadequate combustion that reduces power and can cause other issues. No luck. Unfortunately the very lean air/fuel mixture on the stock bike takes some of the joy out of the riding, because like all other modern fuel injected bikes, the Sportster suffers from misfire, weak idle, poor low speed running, and an unpleasant snatchy Jul 15, 2012 · Hello All, I have been chasing a problem for the last week or so that my 2010 ultra classic will misfire under light load when I am on the highway. When I pull away though, she misfires. Wether the bike is warm or cold it does it. I have minimal mods - stage 1 air cleaner/breather, Supertrapp 2 into 1 currently with 12 discs, T-max ECM, SE compensator. The carb was previously jetted by Harley Davidson for the pipes. I have been experiencing a misfire that acts like a couple of issues I've had in the past. There's about 5 The rear jug misfire and it keeps fouling plugs on my 1991 Sportster. Jun 20, 2012 · I have a friend that purchased a used 2005 Sportster from a HD dealer. Does not do it all the time just some times. It has only 5k miles, so it hasn't been used much. I have an issue with my 2007 Ultra Classic with 44k on the odometer. Customer: Have a periodic backfire or miss on a 1997 1200 Harley Sportster. Seeming like it may be the ignition coil, I replaced that with this one : Drag Specialties Ignition Occasional Misfire At Take Off? I have a 2016 Iron 883 and I have it modified with a K&N heavy breather cone intake, V&H short shots and a V&H tuner. Still running the same Aug 12, 2023 · Worried about vacuum operated petcock problem on your Harley. i was out riding and the bike started misfiring. A spark occurs at the correct time to create optimum engine power. The problem is misfiring at constant speeds. I've read about reading the plugs that's no problem. Once I completed the rebuild, the back firing stopped but now the rear cylinder 1989 Harley 883 Sportster Cam Upgrade Causes Misfire at Low RPM 883 Sportster often faces misfires and sputtering after camshaft upgrades or carburetor rejetting. Unfortunately, there is still just the slightest misfire at low RPM / Low Throttle situations. In other words, it’s when the engine undergoes failure of ignition in Need Help! 04 1200 Sportster is backfiring/misfiring on acceleration! I have a 04 Sporty and it recently started backfiring/popping (gunshot sounds) when accelerating. I’ve replaced the carb, plugs, wires. While you don't want to run with the enrichener on all the time, the Sportster needs it for the first mile or so. Jul 24, 2008 · I am Cruising down the road its flat about 45 in 4th gear the engine doesn't seem to be laboring, It feels like there is a slight misfire/stumble ,5thgear 50-55 same thing only more noticeable. Dec 11, 2011 · At idle (cold and hot) she runs fine. Jan 22, 2024 · I'm new around here, and I'm still getting the hang of how to introduce myself better. I have a 03 Duece. I rebuilt the carb due to a loss of fuel mileage and some popping through the carb on acceleration. It will rerpeat this randomly. 5turns from seated position (guidance from previous forum replies). One of the Oct 19, 2023 · As soon as the third-party part or an upgrade is performed on the Harley, it starts behaving unpredictably. Check for worn spark plugs and replace if fouled. Starts But Runs Irregularly or Misses Read expert Harley Davidson Sportster engine problem guides and repair how to's with photos and videos to help you maintain your bike engine. The bike Apr 22, 2020 · Iron 883 misfiring/stumbling at 2500 RPM iron883 misfire sportster Jump to Latest 3. I can't get a hold of a new plug wire for a couple of days, but I checked the back plug wire with an ohm meter, and it looks like I have good resistance. E. This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles Jan 6, 2023 · 1. This comprehensive guide covers common causes, step-by-step troubleshooting, and essential maintenance tips for smoother performance. Apr 10, 2011 · Hi, I have had my engine totally rebuilt 12000km ago, by a reputable Harley service shop. 2008 Sportster Runs Irregularly or Misses (Troubleshooting) Check for one or more possible malfunctions if your Harley Sportster runs irregularly or misses: Spark plugs in bad condition or Mar 21, 2015 · Ok I'm new here. 9K views 4 replies 5 participants last post by SCHMIDTY Dec 15, 2011 8 Feb 22, 2024 · The Harley Davidson Sportster 1200 series is a popular line of motorcycles renowned for their classic design, formidable power, and the distinct Harley roar. Usualy after riding for a short while and not at first. Can't For all those that wanna talk about Ironhead Sportster Motorcycles Learn how to solve the issue of a misfiring Porsche engine and get back to enjoying your ride. Misfires with wet plugs on a Sportster 1200 conversion can stem from ignition coil or module failure despite spark presence. Oct 31, 2023 · Say no more to those dastardly Harley Davidson sputtering issues! In this comprehensive overview, a seasoned mechanic walks you through it all. sportsterdoc Senior Master Custom Bike Builder Join Date:Apr 2012 Posts:14147 Sportster/Buell Model:1200S Sportster/Buell Year:2002 Sportster/Buell Model #2:XLH883 Sportster/Buell Year #2:2003 Other Motorcycle Model:Moto Guzzi V7-850 SE Other Motorcycle Year:2023 #5 15 April 2019, 18:30 Originally Aug 4, 2018 · My '86 EVO FXR, developed a problem on a ride last weekend. I also unplugged all the sensors and injectors. So, fasten your helmets, folks, because we’re about to rev up our knowledge on the signs of a faulty spark plug in a Harley-Davidson! All wires check out with resistance test. E Ignition Module, S. I have a '05 sportster that misfires intermittently, almost exclusively at low revs, especially when idling with a hot engine, often leading to stalling. Sportster models often face ignition coil failures and clogged fuel injectors causing misfires and stalling. It has slip ons but stock a/c no tuner unless it was flashed. I'm just wondering what will my bike run like if its too rich? I'm worried about it being too lean so I'd rather it be a little rich but what are the performance Jul 25, 2025 · Hello all. Check the ignition timing advance mechanism for sticking or delayed return. I checked voltage at the tmap and it had 5v. I've personally adjusted the mixture screw as the mechanics failed to do this to 4. E Coil, DynoJet Kit, Accell 8. Like I said, it spits and sputters on acceleration. 1. Regular maintenance, including checking and replacing spark plugs when needed, is vital to keep your carbureted Harley running smoothly. I can rev full throttle with the clutch pulled in and it seems fine, but as far as riding goes I have to find that happy medium on the throttle and Apr 29, 2009 · Bike starts and idles great. Common causes include a clogged fuel filter, dead battery, or faulty ignition system. Spot ignition coil issues early to keep your Harley running strong. got it home and started checking it out. Here’s one owner’s advice to a fellow Jul 11, 2023 · Experiencing sputtering issues with your Harley Davidson? This comprehensive guide will help you troubleshoot and fix the problem, getting you back on the road smoothly. Took to HD dealership twice and last time I was told it was a true representation of a Harley Aug 18, 2017 · 2007 Sporty 1200L "misfire"/"cutting out" when hot and hit bumps. 23,375 miles on the odometer. Sep 7, 2025 · If the spark plugs are worn out or not firing correctly, it can lead to misfires and sputtering. Sportster 1200R may experience backfire and misfire after sustained high-speed riding, especially at low speeds. I can give it full throttle and all it will do is misfire badly. I've tried replacing the plugs. When performance suffers, the task of figuring out where to just start often creates confusion. but i have drained the tank and installed fresh gas from a different location. I've checked all wiring connections, checked the battery and charging system to make sure it's all getting enough volts for good spark, and I've checked the VOES as well. You are in the right place. I wish I could make the noise for you. Sent from my iPhone using Tapatalk Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust. Find expert tips and step-by-step instructions here! Jul 27, 2008 · Sportster 883 1997 backfires on take off after idle and when cold Jump to Latest 32K views 34 replies 6 participants last post by Hosepipe Sep 3, 2015 M For discussing problems about your Sportster motorcycle that don't fit anywhere else. Replaced coil, wires and plugs with no luck. It gradually gets worse the longer it runs. This article will guide you and help you diagnose as well as correct the many problems that can hinder your Sportster's engine performance. A motorcycle exhaust backfire is an annoying and potentially dangerous problem to have. It has the dyna jet kit , k&n filter , and seII on her . Dec 18, 2014 · so ive had my sportster for about 2 years now, other then normal maintenance i added the stage 1 screaming eagle tune and ive added taller handlebars, got a switch kit from harley so no soldering or anything, crimped pins to the connectors. Trouble codes are an essential tool when it comes to diagnosing issues with your motorcycle. Learn how to diagnose and fix a misfiring Porsche engine. only ridden 6 times in the last 5 months, and lately Aug 24, 2010 · The intermittent misfire on my '03 Ultra ended up being a faulty FI wire. The bike had been sitting for awhile and the previous owner rode it a considerable distance with it back firing thru the carb. It has been gone thru several times and is in good shape at Dec 1, 2015 · During the past several hundred miles it has developed what I feel is a lean misfire in the rear cylinder, reminds me of the time I had a torn rear intake manifold boot. (in any gear). I’ll look up how to do the air leak test. The bike has ultima single fire. However, like any mechanical equipment, these bikes are subject to wear and tear over time, which may lead to certain issues. I wouldn't say the engine is bucking, its more of a stumbling feeling for a split second or so. Dec 8, 2022 · The sportster ran rough when I took possession with the issues being a very low idle rpm, constant blipping of the throttle to keep it lit, black smoke on idle, and an annoying carb cough (rich condition misfire to be specific). Blackburn_Adam Aug 18, 2017 2007 sporsterxl1200l sportster xl1200l B Maybe those aftermarket pipes have thrown the computer off. Start by inspecting and replacing spark plugs if worn or fouled. Sportster 1200 conversions often face ignition misfires and wet spark plugs under load or at higher RPMs. Feb 8, 2024 · Are you experiencing issues with your Harley-Davidson motorcycle? Don't worry, we've got you covered. The enrichener is a whole separate circuit within the carburetor, that allows a rich mixture of gas and air into the intake. I can twist the throttle and there is no misfire. Apr 17, 2008 · On my Evo, every since I brought it, it ran bad. I have replaced the ignition module, but that didn't fix the problem. The bike has a 103", 255 cams, TFI, de-catted headpipe and SE Fatshotz mufflers. Tried messing with the idle mixture screw. Nov 20, 2010 · What is the procedure for checking for codes. I have adjusted the push rods cleaned the carb and emptied the tank and filled with fresh gas. I have tried new plugs, and tried different plug wires off of a friends Duece. A front cylinder misfire on a 2005 Sportster 1200C often stems from faulty spark plugs, ignition coils, or wiring issues. Had harleys since '1998 but this is only my second sportster. i have change the Dec 26, 2015 · Well my '89 FLHS 80" Evo with 103K miles and the unsolvable lean misfire in rear cylinder is no longer a mystery. I little work with a small wire brush to clean it up, and a small dab of dielectric grease on the boot ( for sealing) cured my issue. What are the possible causes and fixes for the problems? Jan 7, 2004 · Hey folks happy new yr Question . 3K views 5 replies 3 participants last post by n05stang Sep 15, 2021 N Sep 21, 2020 · Engine misfire can make the motorcycle engine run irregular, cause slow acceleration, rough idle and excessive vibration. As an intricate part of the bike’s electrical system, a faulty voltage regulator can lead to problems and even stall-outs. But if i rev it up slightly and hold throttle steady it starts to misfire badly. I feel like I’ve done everything. I can be in I have a '05 sportster that misfires intermittent, almost exclusively at low revs especially when idling when the engine Dec 14, 2011 · 2006 sportster misfire Jump to Latest 3. But, the problem is Jun 9, 2004 · 1999 Sportster 1200 Custom V & H Straight Shots (with baffles), S. but the times i notice it the most is in 6th gear at 74mph at 2800rpm it fells like bad gas or like it looses the crank signal for a second. Random misfires under load on a 1990 Sportster can stem from ignition timing or fuel delivery issues. If I slowly rev it up and down, it will clear up enough to be able to take off, and will run if I keep up the revs, but the instant I let it idle again, it will misfire till I get it revved up again and keep the revs up. Took out all of my fuses and they had some corrosion so I cleaned them. What are the possible causes and fixes for the problems? Your new Harley Sportster have plenty of power, and you will obviously expect it to be easy to ride in all situations without annoying problems. 8K views 4 replies 3 participants last post by Hillbillyexpress Jul 19, 2024 Tyler Mann Discussion starter May 15, 2018 · 2004 Harley sportster 883 “backfire with loss of power when accelerating” 2 reading Jump to Latest 9. Screamin04 Biker Join Date:Jun 2009 Posts:9 Sportster/Buell Model:XL1200C Sportster/Buell Year:2004 #6 23 November 2010, 13:32 Thanks for the help 67hat34c Biker Join Date:Sep 2008 If your bike is running on ONE Cylinder (or none) not firing on other - check this (any vehicle) Harley Davidson V Twin Road King (2007). The bike has ultima single fire May 16, 2013 · Hey fellas. (I checked it against another wire that doesn't May 8, 2023 · Posts Latest Activity Photos Pageof1 Filter new posts 201648Rider Master Mechanic Join Date:Jul 2016 Posts:291 Sportster/Buell Model:48 Sportster/Buell Year:2016 #1 For discussing problems about your Sportster motorcycle that don't fit anywhere else. from harley davidson of Tucson and from time to time when I start to open the throttle slowly or quickly it pops back thru the carburator, and I also changed the spark plugs because it was missed firing at idle and low RPM, what could be the cause?? Unfortunately, there is still just the slightest misfire at low RPM / Low Throttle situations. Nov 11, 2025 · I have a 2010 sportster 883XL that loses spark on the front cylinder for a few seconds then picks up again. Only when Im at a light , and twist the throttle , or when I rap it off Apr 20, 2010 · My 2001 fatboy is only hitting on one cylinder. Trying to figure out what’s wrong is what I’m trying to do here. These misfires can be frustrating, but understanding the possible causes and implementing troubleshooting tips can help resolve the issue. At the time of purchase he bought a 4 year extended warranty. At random intervals, it would start running on only one cylinder, then after 30 seconds to a minute or so, it would come good again, and run fine, for a while, before it decided to do it again. 490 lift can cause low-RPM misfires due to altered valve timing. Feb 19, 2016 · Harley Davidson Sportster: Ignition Diagnostic Guide The ignition system ignites the air/fuel mixture inside the combustion chamber. . Dec 4, 2015 · Sportster Backfire Cause Remedy Jump to Latest 21K views 6 replies 4 participants last post by Thunder~Struck Dec 4, 2015 Maxz695 Discussion starter Sportster often faces misfires under load and carburetor tuning difficulties causing inconsistent performance. In this comprehensive guide, we'll delve into the world of Harley-Davidson trouble codes to help you diagnose and troubleshoot some of the problems your beloved Harley may be facing. The wire had broken inside the casing, so it looked good on the outside. 2002 Sportster 883XL custom Bike starts up just fine, idles fine. Upgrading to an Andrews cam with . The bike was giving him trouble spitting and sputting so he took it back for repairs. Recently, I started getting misfires, backfires, and less fuel economy. May 12, 2016 · Disclaimer: I used the search button already. Additionally, problems with the air intake system can also cause sputtering. Accelerating was great and it ran like a beast until 5th gear, 2900 rpm, 60 mph then it would Dec 12, 2023 · This comprehensive overview covers Harley Sportster problems, scattered across their respective model years with fixes and process included. The rear is less black but is not wet with anything either. ( I have true duals, so it's obvious) It almost goes away at 2500 rpm cruise, but the idle and gentle throttle is rough. As soon as I shift into 2nd I lose all acceleration with anything more than 1/4-1/2 turn of the throttle. First post. I have changed the plugs and the front jug plug is blacker and appears to be burning fine. 1K views 5 replies 6 participants last post by Hillsidecycleco May 23, 2018 Harley MAP sensor failure symptoms These are the most common symptoms of the Harley MAP sensor failure. The surprising thing is if I stop or slow right down it settles down my 1997 harley sprtster 1200 started to backfire and misfire and hesitate, it backfires more when I let off the - Harley Davidson XL 1200 C Sportster Custom question Aug 13, 2016 · 03 88ci firing on only front cylinder new plugs wires coil and ignition module Idk what else to do pls help Mar 7, 2024 · A Harley that turns over but won’t start typically indicates an issue with fuel, spark, or air. Jan 6, 2023 · 1. F. When I first take off, the bike will misfire at low rpms. Faulty Voltage Regulator One of the most common problems on a Harley-Davidson 883 is a faulty instrument voltage regulator, resulting in dim or trembling instrument clusters, failing displays, and inaccurate voltage readings. May 8, 2023 · Posts Latest Activity Photos Pageof1 Filter new posts 201648Rider Master Mechanic Join Date:Jul 2016 Posts:291 Sportster/Buell Model:48 Sportster/Buell Year:2016 #1 For discussing problems about your Sportster motorcycle that don't fit anywhere else. I. Customer: My 2009 harley davidson sportster 1200 is misfiring on startup and will stall if attempted to ride Mechanic's Assistant: How many miles are on the bike? Is it a steady misfire? Or random? Customer: 25k it will start fine and then after 30 sec instantly start to miss Mechanic's Assistant: What is the make/model of your '09 bike? Customer: 1200 custom harley davidson Mechanic's Customer: My 05 Harley Sportster 1200 misfires when it is running at lower rpms after I run it for about 20 minutes. Customer: front cylinder misfire Mechanic's Assistant: How many miles are on the bike? Is it a steady misfire? Or random? Customer: 13k, random Mechanic's Assistant: What is the make/model/year of your bike? Customer: 2005 sportster Mechanic's Assistant: Are you fixing your bike yourself? What have you tried so far? Customer: 1200c Mechanic's Assistant: Anything else you want the mechanic to Nov 16, 2024 · Enough to initiate a rear cylinder misfire code.