banshee back fire - Yamaha Forum : Your Yamaha Motor Products Community & Resource
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post #1 of 3 (permalink) Old 11-19-2009, 04:52 PM Thread Starter
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banshee back fire

I just bought a 1999 Yamaha banshee ,FMF pipes, ported & polished, tores eliminators, when I first got it a month ago it ran fine, now it idles great but back fires before the bike is fully wormed up it will bog out when I give it throttle(when its in gear),when its in neutral it wont back fire and it idles fine I live in Michigan and are weather has been around 50 degrees when I bought it was 65 70, could the cold weather do this, I checked all areas wear exhaust would leak or air would leak, around carbs boost bottle...EXT. nothing the left carb does open a little faster than the right but by less than a 1/16 of and inch, could this be it, compression is around 120. but one good rip down the street and than it works fine. Thanks
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post #2 of 3 (permalink) Old 11-26-2009, 05:16 PM
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I would not think that the temp has anything to do with it. Engines love the cold air, which is denser. Its easier for them to work. Since the machine works after a good run. I tend to think that something is sticking in the carb. Check that 1/16 inch after that run maybe it gets back to equal, Just a thought!!!
Let us know what happens, man
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post #3 of 3 (permalink) Old 04-20-2011, 08:31 PM
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I would try to get the carbs in sync perfectly. make sure the slides are in the right way too. you want the flat side to be facing the engine.

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