66E-1131C-10-00 Power Valve Cover Joint for Yamaha GP-R 800 2003-2005

Power Valve Cover Joint for Yamaha

The Power Valve Cover Joint for Yamaha replaces OEM part 66E-1131C-10-00, sealing the power valve housing on the cylinder so exhaust timing stays consistent.

Overview

This power valve cover joint is a direct-fit sealing component for the Yamaha power valve assembly on 800 series engines. The joint keeps exhaust gases sealed at the power valve cover, helping the valve operate smoothly and protecting the surrounding components from leaks. It suits riders and mechanics servicing or rebuilding a Yamaha GP-R 800 power valve system.

Built For Performance

• Direct cross-reference to OEM part 66E-1131C-10-00
• Seals the power valve cover against exhaust leakage
• Supports consistent power valve operation and exhaust timing
• Constructed for dependable service in marine engine conditions
• Simple replacement for worn or compressed original joints

Fits These Machines

• for Yamaha GP-R 800 (2003-2005)

On-The-Job Use

• Power valve service and rebuilds on Yamaha 800 engines
• Routine top-end maintenance
• Restoring a proper seal after cover removal
• Replacing a worn or leaking power valve cover joint

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: No, this power valve cover joint is an aftermarket replacement that cross-references OEM part 66E-1131C-10-00. It is designed to fit the listed application.

Q: When should this joint be replaced? A: Replace it whenever the power valve cover is removed or the existing joint shows signs of compression, cracking, or exhaust leakage. Fresh sealing helps maintain consistent power valve performance.

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