Don't forget to use the K & N filter cleaner fluid and the K & N filter oil...they arn't designed to be cleaned with parrafin and then lubed with 2 - stroke oil ( read about these ages ago ). Also, the K & N breathes easier so you may be running a tad weak. Not sure how an under powered airhead can benefit from a K & N filter..although a tuned sports bike would gag for one !
A OEM filter lasts about 12,000 miles anyway..almost as cheap as the oil/cleaning kit from K & N
I've got a K+N runs fine, no probs at all.. I do use normal oil tho' on servicing..
NOT K+N's specially squeezed from gnats abdomens..overpriced shite..
Had K & N on the microlights I've owned.....Inspector wouldn't certify it if you coffed to using 2-stroke oil on the filter and had to use gnats abdomens ( ahem, being a scouser, no coff, no job )