I have a 91 rxl 650 and i havnet' really heard too many negative things from the folks I've asked. I did hear about some problems wiht the cranks in the XLT triples but I don't know if it applies to the 650. I burned the top end in my sled The piston on the clutch side burned up and debris got into the center cylinder and scratched it up pretty good. But my sled has almost 9000 miles on it so I can't really complain about it. i didn't put too many of those on it but that's a helluva lot if that's problem engine.