Yamaha F2.5–F70 4-Stroke Outboard Thermostat – 66M-12411-01-00 | OEM

Yamaha F2.5–F70 4-Stroke Outboard Thermostat – 66M-12411-01-00 | OEM

Maintain proper engine operating temperature with this Genuine Yamaha OEM Thermostat (66M-12411-01-00), used across a wide range of Yamaha 4-Stroke outboards from 2.5 to 70 HP, plus earlier F80 and F100 models.

The thermostat is an important component of your Yamaha outboard's cooling system, helping regulate engine operating temperature and protect against overheating. Manufactured to Yamaha's factory specifications, this OEM thermostat provides proper fit and dependable performance for applicable Yamaha outboards.

Engine Compatibility

Fits select Yamaha 4-Stroke outboards, including:

• F2.5, F4, F4A, F6, F6A

• F8, T8, F9.9, T9.9

• F15

• F25, T25, F30, F40, F40A

• F50, T50, F60, T60, F70

• F80 and F100 — 2000 and older

• XTO 425 / 450 — one of several thermostats used on these engines

Please verify your engine model, model year, and part number before ordering. Some newer F15, F20, F25, and F75–F100 models use a different thermostat.

Product Details

• Manufacturer: Yamaha

• Part Number: 66M-12411-01-00

• Replaces: 66M-12411-00-00, 6G8-12411-00-00, 6G8-12411-01-00, 6G8-12411-02-00, 6G8-12411-03-00

• Product Type: Outboard Thermostat

• Horsepower Range: 2.5–70 HP (plus select F80/F100)

• Engine Type: 4-Stroke

• Condition: New

• OEM: Genuine Yamaha

Genuine Yamaha OEM Part

This is a 100% Genuine Yamaha OEM thermostat — not an aftermarket substitute. Manufactured to Yamaha's specifications, it is designed for proper fit, performance, and compatibility with applicable Yamaha outboards.

Using Genuine Yamaha OEM cooling-system components helps maintain the factory fit and performance your outboard was designed around.

Compleat Angler Marine — Authorized Yamaha Pro Elite Dealer

Compleat Angler Marine is an Authorized Yamaha Pro Elite Dealer based in Pompano Beach, Florida. We source our Genuine Yamaha OEM parts directly through Yamaha, giving you confidence that you're purchasing authentic Yamaha components manufactured to the proper factory specifications for your outboard.

Nationwide Shipping

Compleat Angler Marine ships Genuine Yamaha OEM parts nationwide, carefully packed and ready for your next maintenance or repair project.

Note: Always verify fitment using your engine model, model year, and part number before ordering.

Questions? Call Compleat Angler Marine at 954-946-1451 or email support@compleatanglermarine.com.