Yamaha - Thermo switch assy - 6D3-82560-01-00Yamaha Thermo Switch Assembly Cooling System Sensor 6D3 82560 01 00 Overview On Yamaha outboards, keeping an eye on engine temperature isnt optionalits critical. The thermo switch is one of those small parts that does a big job, kicking in when temps get out of range. Ive seen engines saved just because this component did what it was supposed to do at the right time. When its working right, you dont even think about itbut its always watching in the