Sierra 18-3641 Yamaha Thermostat Kit
- Brand:
- Sierra
- Part no:
- 18-3641
Where to buy
View on Amazonpaid link
Sierra 18-3641 is a thermostat kit for Yamaha engines, also marked 3641 in Sierra's naming. It is a kit rather than a bare thermostat. The maker points to its own catalog for the complete application information, so check the Sierra catalog for the engine models this kit covers before relying on it. The part number to match is 18-3641.
Our take
Sierra 18-3641 is labelled as a Yamaha thermostat kit, but the only fitment guidance is a pointer to the Sierra catalog. On a boat that means looking up your engine in that catalog and matching 18-3641 before you trust it.