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Hey guys, New Guy here...
I've been reading the forums for a while now and thought I should join in! I have an 03' Raptor 660 that has been worked a little before I bought it. It has a set of hot cams in it, a slip on fmf muffler and no air box lid. When I bought it the starter solenoid was bad and I killed 2 more till I wired it with a ford style solenoid. That issue got resolved. The issue I am having now is it backfires every now and then at idle but backfires bad when off the throttle and going down a hill. (when using the motor to slow you down). Could the idle screw be off or maybe jetting be wrong. I do have to say that it runs awesome and has a very snappy response when hitting the throttle. Any input would be appreciated.
 

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Welcome to the forum :beerchug:

Your jetting is probably off...check your plug to see what color the tip is...If it's white it's lean (need to adjust , if it's black it's rich....some of the 660 guys can probably jump in here to help you out on specifics for jetting though. :thumb:
 

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sounds like you need larger pilot jets. if the previous owner didnt mess with the jetting i would go ahead and rejet completely.
 

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ya i 2nd bdc on that VITOS jet kit, i have one they are great. they give you everything you need including new needles and better mixture screws. good luck!
 
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