Just got my first dirtbike... the mighty 2006 YZ450F. I've roadraced streetbikes for the past 6 years - but with many recent deaths and very serious injuries on and off the racetrack, I've decided to try the dirtbike world for a change. My experience on dirtbikes is limited - but after riding a buddy's '04 YZ450F on the ice last winter, I was instantly hooked. Anyway - I always take the absolute best care of my machines when they're parked. I never abuse them when riding, but I definitely ride hard. I plan on keeping the bike totally stock until I'm more comfortable with this new lifestyle - simply trail riding this summer, maybe some mx track time? Then riding the ice this winter. That being said, what can ya'll tell me about caring for my new machine? From what I've been told thus far: The two most important things you can do is change the oil and clean the air filter after EVERY ride. Well, I did that for the first time yesterday and (although I'll get better/faster with time) it sucked. The oil....no big deal. But cleaning the foam-type air filter sucked. I used aerosol (SX brand?) filter cleaner and oil. If I have to do that after every ride....I may not ride nearly as much as I'd like to. Or just buy new pre-oiled filters....but I've been warned about that too. I read an article saying that the pre-oiled ones are cheap and don't offer enough protection. Also, I've read bad things about the aerosol oils....the pour-on types are better? Help....roadrace bikes don't have this issue. Advice? Thanks in advance!!!