The Sierra 18-3540 Thermostat replaces Yamaha 6E5-12411-30, Yamaha 6E5-12411-10, Yamaha 6E5-12411-20 for Yamaha Outboard applications. It regulates cooling-water flow as the engine warms and cools, helping maintain the intended operating temperature.
Suits outboard models:
9.9FMH, 15FMH, 20DMH, 25NMH 25NWC, 40VETO 40VMHD 40VWHTO, 50HET 50HETO 50HMHD 50HMHO 50HWHTO, 90AETO, 115CET, 130BETO L130BETO, 150FETO L150FETO, 175DETO, 200FETO L200FETO, 225FETO L225FETO
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3540?
Sierra 18-3540 is an aftermarket thermostat for Yamaha Outboard applications.
Which part numbers cross-reference Sierra 18-3540?
This listing cross-references Yamaha 6E5-12411-30, Yamaha 688-12411-00, Yamaha 688-12411-01 and Yamaha 688-12411-10. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3540 fits my Yamaha Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
