Something to watch for on the CX models (both the 500 and the 650, same motor) is a bad water pump, they are notorious for failure and are TERRIBLE to repair. I have a manual sitting around here for a 500 and if I remember correctly, the motor has to come out competely to do the repair.
2014 CRA Senior II and Buckeye Series champ
2012 CRA Senior II champ
2011 CRA Senior II and Buckeye series Harescramble Champion
2009 CRA Senior II and Buckeye series champ.
2007 CRA Senior II, and Buckeye series Harescramble Champ.
2003 Lonestar 250R
2001 Lonestar 250R.....now a 310
1986 TRX250R (restored to new)
1986 TRX250R (still in pieces)