Top End Gasket Set and Valve Seals for Yamaha Moto-4 225 Tri-Moto 225 1983-1988

Top End Gasket Set & Valve Seals for Yamaha

This top end gasket set with valve seals refreshes the upper engine seals on Yamaha Moto-4 225 and Tri-Moto 225 models.

Overview

This top end gasket set and valve seal kit for Yamaha covers the gaskets needed when servicing the cylinder head and cylinder on Moto-4 225 and Tri-Moto 225 engines. It replaces worn gaskets and hardened valve seals that cause compression loss or oil burning. The set suits owners rebuilding a top end at home or in a shop.

Built For Performance

• Includes head gasket, base gasket, and valve seals for a complete upper engine reseal
• Gasket material withstands high combustion temperatures and compression loads
• Valve seals control oil passage into the combustion chamber
• Cut to match the bolt and stud locations of the 225 engine
• Seals the cylinder-to-head and cylinder-to-case mating surfaces

Fits These Machines

• for Yamaha Moto-4 225, 1983-1988
• for Yamaha Tri-Moto 225, 1983-1988

On-The-Job Use

• Top end rebuilds after loss of compression
• Valve seal replacement to reduce oil consumption
• Cylinder head removal and reinstall during engine service
• Restoring older Moto-4 225 and Tri-Moto 225 engines

Specs At A Glance

Good To Know

Q: Can I install this set without machining the head? A: Yes, if the head and cylinder surfaces are flat and undamaged, the gaskets install directly, though resurfacing is recommended if warping is found.

Q: Are the valve seals included for both intake and exhaust valves? A: The seal set covers the valves of the 225 engine, so plan on replacing seals on every valve while the head is off.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.