Hey- Just wondering if I could get some advice. I bought a WR450 in March, it is my first bike. I have be on it about 6 times, probably 25-30 hours. I changed the oil after the first 5 hours and I will change it again soon. How often do you recommend. I am getting ready to do all the mods to it this week... aka Pipe, gray wire, Throttle stop all the good stuff... Also the book calls for valve checks which my dealership wants some stupied amount to do. I talked to a few guys I know with 450's and they said just ride the hell out of it another season and then get the valves checked... What do you think I should do? Also is there any other stuff you would do aka fluids changed before we get ready for a kick ass season approaching fast?