Athena Top End Gasket Kit for Yamaha (P400485600118)

The Athena P400485600118 Top End Gasket Kit is designed for professional, semi-professional, and amateur riders who want to refresh the engine before a race or during the riding season. This replacement gasket set supports reliable top-end service and is suited to maintenance applications where proper sealing and compression control are essential.
The kit includes a premium MLSS head gasket along with multiple high-quality base gaskets in different thicknesses. This selection allows the installer to adjust the engine’s compression ratio according to the application, helping accommodate standard pump gas with stock compression or race fuel with a higher-compression setup. The gasket materials are selected to provide dependable performance under demanding engine conditions.
Athena is known for producing precision replacement components for powersports applications, and this Yamaha top-end gasket kit is made to support professional-quality engine service. Before installation, compare the supplied gaskets with the original components and follow the engine manufacturer’s service procedures for torque specifications, surface preparation, and assembly sequence.
This kit does not include valve stem seals, rubber components, shims, or additional fiber gaskets. Confirm application compatibility with your Yamaha engine before ordering and replace any excluded sealing components separately when required.

Features:

• Application: Designed for professional, semi-professional, and amateur riders refreshing a Yamaha engine before a race or during the riding season

• Kit Contents: Includes a premium MLSS head gasket and multiple base gaskets in different thicknesses

• Compression Adjustment: Provides gasket thickness options for stock-compression pump-gas setups or higher-compression race-fuel applications

• Engine Service: Supports reliable top-end maintenance and precise sealing during engine reassembly

• Exclusions: Does not include valve stem seals, rubber components, shims, or additional fiber gaskets

Ships from Parts Unlimited.