hi Guys i got 06 kfx400 and i bought like year ago and the guy said it's bored over .40 and i don't know and it's backfiring and popping when you hit the throttle and sound like it's going to die but still ides fine
Has it ever run right since you had it? Or just started running bad? Been sitting awhile? What jets were installed in it? Adjustable needle or factory?
If it keeps doing it intermittently, I’d suspect a wiring problem.
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