Someone I talked to said if you run a K&N filter, it leans the quad out a little for those of you who have plug fouling problems... does anyone know if this is correct?
One thing I learned about K&N filters when I was working for Team Honda's Scott Summers was that K&N filters clog much faster than foam filters and will richen your motor! His testing showed that a good dual stage foam filter works much better for offroad than K&N.