Back fire, help!
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Stage IV
Joined: Jun 2014
Posts: 4
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From: Kentucky
Back fire, help!
New to HD world, rode a metric for 5 yrs, just purchased 03 Fuel injected EG ultra classic anniversary with K&N air filter and Kerker slip on's. No back fire when purchased but since I removed Y pipe and mad true duals out of exhaust I get back firing when off throttle and sometime just changing gears {it is back fire not normal back off rumble}.
I have read a lot of post on here about fuel programming for air or exhaust changes and wondered witch would be best for my problem. Love the sound and the performance so no more changes to air or exhaust, and I have checked and no exhaust leaks. Any help would be great!
Never knew what I was missing, "American Muscle".
I have read a lot of post on here about fuel programming for air or exhaust changes and wondered witch would be best for my problem. Love the sound and the performance so no more changes to air or exhaust, and I have checked and no exhaust leaks. Any help would be great!
Never knew what I was missing, "American Muscle".
Road Master
Joined: Apr 2012
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From: Phoenix
You said no back fire with stock Y pipe and now true duals and back fire? I had just the opposite. When I bought my 04 EG new I change somethings, air cleaner, Thundermax and slip ons. I would get tramedous back fire, like a canon. Zippers told me the left side was sucking cold air up into the ride side exhaust causing this kaboom. Bough some V&H true dual headers and no back fire since. Since then I had head work and cam put in, dyno'd.
Outstanding HDF Member
Joined: Mar 2014
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From: Michigan
Do you have a tuner? As you know changing to a true dual you are changing the A/F mixture, if you do not have a tuner you need to get one ( riders choice ) you say no exhaust leaks so as far as I know you need a way to get a better A/F mixture. I could be wrong but I believe back fire is from the gases that are not removed in the exhaust fast enough, meaning that there is more gas flowing then air. I hope someone chimes in that knows a little more.
Outstanding HDF Member
Joined: Jul 2007
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From: Woodinville, WA
I know you think it's a backfire but I'd get a second opinion. It's quite common for modified bikes to experience fuel ignition in the pipes from time to time. It's loud, but not a backfire.
Seasoned HDF Member
Joined: Dec 2005
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From: poway
Fuel injected Harley needs a tuner or some sort and to be tuned to get rid of the backfire.. The EFI is utilizes algorithms that require tuning for specific way the motor is built.. It tries to calculate the specific fuel and timing requirements for that build. Changing any part of that build requires that the EFI be re-tuned. The exhaust is part of that build as it changes the exhaust flow and scavenging.. This is a bit different from a carborated motorcycles as they are more tolerant but they still can need jet changes.
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Joined: Nov 2004
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From:
You will need to put a tuner of some sort on with a map for your upgrades or take to a good indie that has a dyno so you can get it properly tuned as it should be. Nothing serious about what you have done so someone such as fuelmoto can more than likely step up to the plate with a tuner that has a map already installed.
What part of Ky. Are u from ? If your close to Tn. Shoot me a PM and I'll hook you up with someone that can and will take care of your problem !
What part of Ky. Are u from ? If your close to Tn. Shoot me a PM and I'll hook you up with someone that can and will take care of your problem !
Last edited by Tn.Heritage; Aug 3, 2014 at 06:17 AM.
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Thread Starter
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Stage IV
Joined: Jun 2014
Posts: 4
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From: Kentucky
Thanks for the reply's, looks like a tuner or dyno time in my future.
TcHunter, no tuner, bought in June with 10k miles on it with road rash on left side, unsure of previous work to motor.
davesswork, it does seem to be occasions when raw fuel is being dumped in exhaust, that being said wouldn't a tuner help with that?
mkguitar, rear cylinder is the dominate one but front will on occasions.
TnHeritage, 100 miles due north of Cookville. Who or what is fuelmoto?
Forums are great, vast amount of "worldly knowledge". This will start a battle, lol, What tuner would be best for this amount of mods?
TcHunter, no tuner, bought in June with 10k miles on it with road rash on left side, unsure of previous work to motor.
davesswork, it does seem to be occasions when raw fuel is being dumped in exhaust, that being said wouldn't a tuner help with that?
mkguitar, rear cylinder is the dominate one but front will on occasions.
TnHeritage, 100 miles due north of Cookville. Who or what is fuelmoto?
Forums are great, vast amount of "worldly knowledge". This will start a battle, lol, What tuner would be best for this amount of mods?
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,292
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From: Eastern NE
^^^Good Possibility^^^
This was my 1st thought...without tuner, EFI bike can run lean and have some pre-ignition, however, most of the time exhaust leaks are the culprit.
When you swapped pipes, did you get everything torqued correctly, switch exhaust gaskets and use liquid copper on the pipe/header joint(s)? One way to test for leaks is (1) start bike, (2) put on heavy/leather gloves, (3) plug exhaust ends and (4) listen (hissing or whistle). Good luck!
This was my 1st thought...without tuner, EFI bike can run lean and have some pre-ignition, however, most of the time exhaust leaks are the culprit.
When you swapped pipes, did you get everything torqued correctly, switch exhaust gaskets and use liquid copper on the pipe/header joint(s)? One way to test for leaks is (1) start bike, (2) put on heavy/leather gloves, (3) plug exhaust ends and (4) listen (hissing or whistle). Good luck!
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