The Sierra 18-3639 Thermostat replaces Yamaha 6EK-12411-00 for Yamaha Outboard applications. It regulates cooling-water flow as the engine warms and cools, helping maintain the intended operating temperature.
Suits outboard models:
F115L (2014+), F115X (2014+), VF115L (2015+), VF115X (2017+)
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3639?
Sierra 18-3639 is an aftermarket thermostat for Yamaha Outboard applications.
Which part numbers cross-reference Sierra 18-3639?
This listing cross-references Yamaha 6EK-12411-00. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3639 fits my Yamaha Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
