Yamaha - Cover, thermostat - 6DA-12413-A0-9SYamaha Thermostat Cover Cooling System Component 6DA 12413 A0 9S Overview This thermostat cover is one of those simple pieces that plays a big role in keeping your cooling system sealed and working the way it should. It holds everything in place around the thermostat and keeps water flowing where it needs to go. When these covers start to warp or corrode, youll usually see it in leaks or inconsistent engine temps. Swap it out, and youre back to steady