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Discussion Starter · #1 ·
i just put an HMF, K&N, and a dynojet jet kit with the dj170 on my foreman 500 and my fuel/air screw is 2.5 turns out....but my problem is if i am in the upper rpms and i let off the throttle completely, its backfires pretty bad.....i was just wondering if anybody could help me out with this...thanks

graham
 

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I have the same setup and it happens to me sometimes.
 

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I have the same setup also and mine doesnt do it alot but when i really get on it and let off it will backfire alittle its not uncommon.
 

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backfire

Sounds to me like lean mixture pop it is caused by air/fuel ratio being too lean worth a check
 
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