Marine Thermostat – Fits Yamaha F300/F350 4-Stroke V8 (Replaces 6AW-12411-00-00, 18-3634) 140-370HP based on the provided compatibility

based on the provided compatibility data

The best way to ensure a match is to cross-reference the part number printed on your old belt

Verify all images and specifications against your original part before purchase

and this kit is a confirmed replacement for both OEM part numbers

Brand Part Number Notes Yamaha 90430-08003-00 Current OEM part

Marine Thermostat – Fits Yamaha F300/F350 4-Stroke V8 (Replaces 6AW-12411-00-00, 18-3634) 140-370HP based on the provided compatibilityProduct Details This is a direct replacement Marine Thermostat for Yamaha F300 F350 4 Stroke V8 Outboards, specifically designed to fit 300HP and 350HP V8 engines manufactured between 2007 and 2018. It maintains the correct engine operating temperature for optimal performance and fuel efficiency. It serves as a direct replacement for Yamaha part number 6AW 12411 00 00 and Sierra part number 18 3634. Engineered for direct OEM replacement fitment.