300ex backfires

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09-23-2003, 04:43 PM

ROOTYTOOTIE

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300ex backfires

On my 300ex i have a Big Gun exhaust with whitebrothers headpipe and jet kit with vents in my airbox. I was wondering why it backfires at high reving.[img]i/expressions/face-icon-small-confused.gif[/img]

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09-23-2003, 05:53 PM

JoshCVBz

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300ex backfires

Sounds like you are probably running lean. did you rejet?

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09-23-2003, 06:52 PM

RacinJason

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300ex backfires

You need a moe bigga main jet

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09-23-2003, 06:56 PM

ROOTYTOOTIE

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300ex backfires

thanks for the in formation. i have a 128 main jet, what should i put.

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09-24-2003, 12:19 AM

RideRed420

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300ex backfires

about 130, 133, 135.....imo

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09-25-2003, 03:45 PM

ROOTYTOOTIE

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300ex backfires

thanks, i will try out those

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