Shopping from Canada? 
Go to Defender Canada!
Description
The Sierra Yamaha Thermostat Kit 18-3609 is a reliable replacement designed to maintain optimal engine temperature and performance. With a precise 122°F (50°C) rating, it helps prevent overheating and ensures smooth operation. Ideal for select Yamaha 25-250 HP outboards from the 1990s and early 2000s.
Sierra Yamaha Thermostat Kit - 18-3609 Item # 1780944
Description
Specifications:
- Temperature Rating: 122°F / 50°C
Fits:
- 25 (1996-98, 2001-02)
- 40 (1991-99, 01)
- C40 (1997-02)
- P40 (1998)
- 50 (1991-97, 1999-02)
- C50 (1998-01)
- P50 (1991-96)
- L225 (1994-99)
- S225 (1996-99)
- 250 (1991-95)
- L250 (1991-99)
- S250 (1996-99)
Replaces:
- Mallory:
- 9-43038
- 9-43178