backfire problems

[warrior_rider]

hey guys i put the hmf sport series on my 2000 warrior and it seems to backfire alot sumtimes even spittin large flames out of the pipe what iz the problem and what can i do to fix it..

[300exr]

u need to rejet i wouldnt recomend ridint until tou do or u will burn up valves

[Mike/HMF]

On the Warrior you should adjust the air fuel mixture screw first, you should adjust it 2.5 turns out from the bottom or the highest smooth idle. Then you should check you jetting by doing a plug check. http://67.15.38.161/forums/showthread.php?t=32
Mike/HMF