changing air filter

[midden]

I noticed a difference immediately when I put my K&N filter on. Nothing to do with power, just more responsive on the throttle.
I clean it once a year using warm water and washing detergent powder, let it dry naturally on a warm sunny day, then lightly oil it with the proper K&N Oil Spray. I'm still on my first can of spray and had the filter for a few years now, so not expensive at all. And it will be the last filter you ever buy for the bike.

I went K&N mainly to save hassle of changing it every year or sooner.  45k miles of untouched use is great