The Sierra 18-3541 thermostat is an essential replacement for Yamaha 25 to 40 Hp outboard motors. Its function is to regulate and maintain an optimal engine temperature, preventing overheating and ensuring stable performance on every sea outing.
Technical Specifications
- Compatible with: Yamaha motors 25-40 Hp (check exact models before installing)
- Brand: Sierra
- Manufactured with high-quality materials, resistant to saltwater and corrosion
- Ref. Sierra: 18-3541
Advantages
- Precise temperature regulation: protects the engine block and improves efficiency
- Prevents common overheating failures
- Reliable and easy-to-install replacement
- Developed under quality standards equivalent to OEM
Applications
- Boats with Yamaha outboard motors between 25 and 40 Hp
- Replacement of worn or damaged thermostat to restore optimal functionality
Installation and Maintenance
- Review your engine manual for compatibility and assembly procedures
- Always use new gaskets when installing a new thermostat
- Periodically check the cooling system
Recommendations for Long Service Life
- Use fresh water whenever possible after each outing to clean salt residues
- Regularly inspect the thermostat following the manufacturer’s manual
Technical Specifications Table
| Application | Yamaha outboard 25-40 Hp |
| Sierra Reference | 18-3541 |
| Material | Durable compounds (check specification) |
| Type | Marine thermostat |
