About to replace the cam chain on your ATC250ES/SX, dont forget the tensioner. If your chain is due for replacement chances are the tensioner is due also. The tensioner helpos maintain correct pre-load on the cam chain ensuring quiet running and smooth operation. Suits ATC250ES 85-87, ATC250SX 85-87, TRX250 85-87, TRX250X 87-92, TRX300 88-98, TRX300EX 93-05.

The cam chain guide works in unison with the cam chain tensioner to ensure the cam chain tracks correctly and retains proper tension. It should be replaced with the tensioner or during top end rebuild. Suits ATC185/S 80-83, ATC200 81-83. ATC200E/ES 82-84, ATC200X 83-85, ATC200S/M 84-86