Yamaha Outboard Thermostats (4-Stroke Models)

Thermostats (4-Stroke Models)

If an outboard is operated without a thermostat properly installed, it will suffer from poor performance. Buy a thermostat and a gasket to help your 4-stroke Yamaha outboard operate at the proper engine temperature and avoid excessive carbon buildup.
4-Stroke Model Thermostat
F2.5, F4, F4A, F6, F6A, F8, T8 66M-12411-01-00
F9.9, T9.9, F15, F25, T25 66M-12411-01-00
F15C-F20 6AH-12411-00-00
F30, F40, F40A, F50, T50 66M-12411-01-00
F60, T60, F70 66M-12411-01-00
F75, F90 67F-12411-01-00
F80, F100 (~00) 66M-12411-01-00
F80, F100 (01~) 67F-12411-01-00
F115 60V-12411-00-00
F115B 60V-12411-00-00
F150, F200, F225. F250, F250B 67F-12411-01-00
VF200, VF225, VF250 (4.2L) 67F-12411-01-00
F225, F250, F300 (4.2L) 6CE-12411-00-00
F300, F350 (V8) 6AW-12411-00-00

Need other parts?

Do you need parts not listed in these application guides? See our Yamaha engine diagrams. Please see our model number reference guide if you aren't sure about the year or model of your outboard engine.