I picked up a nice 2000 w/ a DSP titanium exhaust (only mod). I added a T-handle mixture screw, a new NGK plug and cleaned the UNI filter and she runs great. I've been a 2-stroke Honda guy for 15 years and dont know too much about these bikes and my question is..... What do I need to know? is there any known problems with these bikes? Valvetrain issues? Tranny issues? Anything? Thanks.