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Discussion Starter #1
My 2004 Bruin 350 is backfiring at full throttle. Any other position it runs fine. I have rebuilt carb, changed plug and air filter. Does anyone have any idea what might be causing this?
 

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Discussion Starter #2
Something I just noticed is when it's in neutral, it will run full throttle with no issues. It only backfires when in gear.
 

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It could be that the needle jet in the slide in the carburetor is set to high and letting too much fuel come through at WOT.
 
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