I've got a K&N air filter on order for the Aprilia, partly as I didn't find OEM or pattern around when searching, but does changing to K&N need the mixture adjusting - it's fuel injection so not a jet thing but might I need to change the EPROM to suit? Have read posts elsewhere warning of weak fuel mixtures being bad news! Bike has standard exhausts on.
only changed my jets when changing pipe's for noisy one's! didnt do any mod when changing to a K&n run it for a while then check plug for sign's of weak mixture, need to take a run blast it a bit turn egine off an coast to stop so you dont soot it up at a low or idle speed,then check plug! mine ran ok!deffo better with the K&N
Something i found with K&N and similar filters was that they sucked in water when it rained heavy. You can buy air filter oil for them which helps a bit. Trial and error with them really.
![Air Filters - Forums [Biker Match]](/images/backgrounds/strips/8mobileLQ.jpg)
![Air Filters - Forums [Biker Match]](/images/backgrounds/strips/8desktopLQ.jpg)
