I have put a K&N Air filter with the sleeve on and was wondering if I should change my jetting. On dry days I run it without the air box lid on but on muddy days i leave it on. It is not missing or anything but i thought it might run better if I did.

 

If all you did is a filter then leave the jetting stock.

 

What does your plug look like?

 

yea leave jetting stock