[rga2006]

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

 

[TEXAS MUDSLINGER]

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

 

[muddin500]

mine does it alot the boys behind me says it shoots a blue flame bout 1 foot out the pipe i have seen it do it when i ride hard then cut it off in the dark it will kinda burp one out

 

[dirtyrider6104]

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.

 

[downndirty]

backfire

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

 

[rga2006]

alright well i wasn't sure if everybody's else was doin this or not...
thanks for the help...