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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through March 20, 2008 » MISFIRE/BACK FIRE/CUT « Previous Next »

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Stavrossi
Posted on Saturday, February 23, 2008 - 04:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
BIKE WHEN ACCELERATED, MISFIRES,
THEN BACKFIRES,
THEN CUTS

SPARK ADVANCE AND THROTTLE POSITION ARE ATTACHED FROM 2 RIDES , SAME PROBLEM.
ANY IDEAS WOULD BE WELCOME, DEALER ADMITS THEY ARE STUMPED

ENRICHMENT AFTERWARDS ALWAYS INCREASES =+/- 16%
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Bombardier
Posted on Saturday, February 23, 2008 - 10:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Air leak on the intake manifolds.

Blocked fuel/faulty fuel pump.
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Tazmania720
Posted on Thursday, March 13, 2008 - 08:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
how in the world does a leak in the intake manifold cause a backfire? I am having a similar problem with my 99X1 and recently heard that problem. I just don't get how the part that lets air mix with the fuel, a leak in a gasket, i am guessing, would cause the problem.
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Bombardier
Posted on Friday, March 14, 2008 - 06:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
When the engine runs lean it tends to get hotter. Also a lean mixture ignites easier than a rich mixture so what may be happening is preignition due to the lean mixture. This can be caused by letting too much air in eg a leaking intake manifold rubber gasket or the injectors not injecting enough fuel blockage or not enough fuel.
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