yfz back fire

[Hondarider440ex]

what all damage can come from a four wheeler back firing cause my yfz is doing it when i slow done at a high rpm and when i start off fast it shoots small flames out then they get sucked back in

[jd450]

mine did that for a week or so after i had my gyt-r header/exhause/jetkit installed but it stopped.

[Hondarider440ex]

can it hurt the motor like burn a valve

[beastlyone]

nahh its only the unburnt fuel being lit nd fires out of your exhaust, not hurting the motor

[GPracer2500]

Sounds like the jetting is too lean. That can damage the motor if severe enough.

[yfz450bk]

my yfz backfires too when i back down off of high rpms..i've rejetted a bunch of times and nothing solves it and my motor is in great shape so i wouldn't worry too much about it..................and i was just wondering where gpracer2500 got that sweet animation icon...lol

[sim]

check your header stud nuts to see if they are loose because if there’s an air leak between your header and the head it will cause back firing.

i speak from experience!

[yfz450bk]

good call on that..i'll make sure to check that out..thanks man

[sim]

no prob let me know if thats what it was hahaha