Thermostat for Yamaha Outboard 2-Stroke Engines | Replaces 688-12411-10 / 6H3-12411-11 / 6E5-12411-02 | 60°C Rated

Ensure your Yamaha outboard engine operates at peak efficiency with this high-quality 60°C thermostat. Built to OEM standards, this reliable replacement part helps maintain ideal engine temperature, improves combustion, reduces wear, and extends engine life—especially important for 2-stroke engines operating in marine environments.

✅ Opening Temperature: 60°C / 140°F
✅ Replaces OEM Part Numbers:

• 688-12411-10, 688-12411-11

• 6H3-12411-11-00

• 6E5-12411-02, 6E5-12411-10, -11, -20, -30

✅ Wide Compatibility:

• Yamaha 2-Stroke Outboards:
  3HP, 4HP, 5HP, 6HP, 8HP, 9.9HP, 15HP, 25HP, 30HP, 40HP

• Also fits select larger Yamaha models: 115HP – 250HP

• Compatible with select other brands using similar thermostat specs (check cross-reference)

✅ Features:

• Marine-grade corrosion-resistant construction

• Helps regulate cooling system efficiency

• Prevents overheating or overcooling

• Easy direct-fit replacement

• Suitable for long-term saltwater and freshwater use

⚠️ Important Note:
Always check the compatibility with your engine’s exact model and year before purchase. Even if the part looks identical, verify part numbers and specs for proper fitment.