backfiring.. hmm
Thread Starter
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Road Warrior
Joined: Jul 2008
Posts: 1,274
Likes: 9
From: Tampa, FL
backfiring.. hmm
ok, heres the problem.. buddy of mine got an 85 FXRP. stock carb on it and as far as i know stock pipe. he starts the bike and starts backfiring out of the pipes when he hits the throttle and when hes cruising it pops on him and makes the bike jump.. any idea whats causing this? im thinking his mixture is off... maybe manifold leak? any helps appreciated.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Sounds like electrical, check all connections from the battery to the ignition and don't forget the grounds. What was done to the bike before this started? How do the plugs look? Hope this help, let us know what you find.
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Road Warrior
Joined: Jul 2008
Posts: 1,274
Likes: 9
From: Tampa, FL
also, shoots flames when it backfires out of the tail pipes
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Check the battery connections including the grounds first, I am not sure, but I believe there should also be a flat braided ground from the frame to the engine also as it is a rubber mount and the engine is not grounded well without it.
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Road Warrior
Joined: Jul 2008
Posts: 1,274
Likes: 9
From: Tampa, FL
cool, will check it out
Road Warrior
Joined: Jan 2005
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From: South Jersey
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Road Captain
Joined: Jun 2008
Posts: 640
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From: Hickory, NC area
Might be sure the exhaust is sealed at the head - if it is sucking air in and the mixture is rich, the exhaust gases can ignite from the heat.
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Joined: Aug 2008
Posts: 89
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From: kentucky
my bike did that i had a manafold leak. start the bike get it to an idel take some carb cleaner spray all around the intake if it kills the bike its leaking. also after i found my leak after awile it started agin i had a crack in my carb leting it suck air