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kfx400 backfiring and popping

843 views 6 replies 3 participants last post by  jetmech25 
#1 ·
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
 
#2 ·
Welcome! Start with cleaning out the jets and the rest of the carb.
 
#3 ·
See what jets are in there while you are cleaning it. Then let us know if it has an airbox lid..
 
#5 ·
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?
 
#7 ·
If it keeps doing it intermittently, I’d suspect a wiring problem.
 
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