Aight, heres the deal. I just bought a 1992 RMX250 dirtbike the other day. Ive always rode four wheelers and only a few dirt bikes here and there but never owned one myself. I wanted a bike to just play around on and see how i liked it and i happen to run across a nice on pretty cheap. The needle stuck so i tore the carb apart and cleaned it and it runs like a champ. It really is a good bike and i just may enjoy it. But here's my questions... The thing will not idol no matter what i do with the idol screw but it will sittin there with the choke on during warm up. What could cause this and what can i do? And my other question may be a dumb on but what kind of oil should i put in the case?How often should i change it? and how do i know when its full? I know that sounds bad but i havent messed with many 2-strokes outside of doing a couple piston and ring jobs for a couple of people. THanks for all the help!