Thermostat Assembly – Fits Yamaha Outboard 2.5-100HP (Replaces Yamaha 66M-12411-01-00) 415HP We have included both known

We have included both known ranges (1994–1998 and 1980–1983) to cover all possibilities

Installation: Direct bolt-on OEM replacement

but typically cost significantly more

Is this a genuine OEM part

and there should be no wobble or movement

Thermostat Assembly – Fits Yamaha Outboard 2.5-100HP (Replaces Yamaha 66M-12411-01-00) 415HP We have included both knownProduct Details This Yamaha Thermostat Assembly is an essential component designed to maintain proper engine operating temperature by regulating coolant flow. It is engineered for a wide range of Yamaha 4 Stroke Outboards from 2. 5 HP to 100 HP, covering models from approximately 1996 to 2023. It serves as a direct replacement for Yamaha OEM part 66M 12411 01 00 and interchanges with aftermarket references like GHmarine 66M 12411 and PWCParts 66M