Athena Top End Gasket Kit for Yamaha (P400485600267)

The Athena Top End Gasket Kit, part number P400485600267, is designed for professional, semi-professional, and amateur riders who want to refresh engine sealing before a race or during the riding season. This performance-focused kit helps support reliable top-end service while giving riders flexibility when setting engine compression for different fuel requirements.
The kit includes a premium MLSS cylinder head gasket along with multiple high-quality base gaskets in different thicknesses. This selection allows the installer to fine-tune cylinder height and compression characteristics according to the engine setup, riding conditions, and fuel choice. Use the appropriate base gasket to maintain stock compression for standard pump gas or select a configuration that supports higher compression when using race fuel.
Each Athena P400485600267 kit is intended to provide a practical gasket solution for top-end maintenance and engine setup adjustments. The included materials are selected for dependable sealing and consistent fitment when installed according to the engine manufacturer’s service procedures. Always inspect mating surfaces, verify gasket selection, and follow the recommended torque sequence during installation.
This kit does not include valve stem seals, rubber components, shims, or additional fiber gaskets. Confirm vehicle application and engine specifications before installation to ensure the correct gasket thickness and configuration are selected.

Features:

• Application: Designed for professional, semi-professional, and amateur riders performing top-end engine service

• Head Gasket: Includes a premium MLSS cylinder head gasket for dependable sealing

• Base Gaskets: Includes two or more base gaskets in different thicknesses for compression adjustment

• Compression Setup: Supports stock compression with standard gas or higher compression with race gas

• Service Use: Suitable for pre-race engine preparation and midseason maintenance

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

Ships from Parts Unlimited.