do you have to re jet?

[klutchbuster250]

i know this is stupid but do u need to re jet when u put a k&n air filter .just the filter ,im just replacing the stock filter

[YFZ450SE]

Yes:o

[FreekShow]

what kinda quad? if its a 250ex then im 95% sure that you DO NOT have to.

[CannondaleRider]

A while back I went from stock to a K&N on my Wolverine, and it actually put it where it was supposed to be. It was rich from the dealer, and it put it closer to a right mixture.

Easiest way to find out, do a plug check. Do a 5th gear pinned run, then pull in the clutch/pull up on the shifter, and shut off the quad. Don't start it, but pull the plug, and see if its rich, lean, correct, etc.

[zeppelin]

yes it is mandatory everytime you change anything that affect airflow, check my thread in the how to section if you need some tips, and pm me if you need some more help...