Hey guys, I'm looking into a new 450 to run supermoto and play around on the MX track with. My son's first two bikes (PW80 and TTR50) were Yamaha's so he wants his old mans new bike to be a Yamaha too. I really like the white 07 YZ and will probably end up ging that route if I can get a few things answered. Like I said the predominant use will be in S/M trim for competeing in a series around here. Then there will be an ocasional excursion to the MX park to ride with freinds. I'm not super big into MX, but still want to be able to hang out with my buddies who ride and race post vintage. If I can get Virginia to give me a title, then I'd ride it in SM trim to school (5 miles one way) here and there. What are the recomended intervals for valve checks and replacement? Also what is the oil capacity and how frequently shoudl it be changed? I am a freak about changing my oil anyway so this really doesn't bother me, but I just want to get an idea of what it is going to be. Thanks.