6S5-12121-00-00 Exhaust Valve for Yamaha 242 LTD S 1800 2010-2019

Exhaust Valve for Yamaha

This exhaust valve for Yamaha is designed to control exhaust flow in the 1.8L marine engine, carrying OEM cross-reference 6S5-12121-00-00 for direct replacement.

Overview

This exhaust valve for Yamaha provides a reliable replacement for worn or damaged valves in the 1800cc engine. It is built to seal combustion gases and manage exhaust flow for consistent engine performance. Ideal for owners performing top-end service or rebuilds on their Yamaha boat engine.

Built For Performance

• Precision-ground valve face for a proper combustion seal
• Heat-resistant alloy construction suited to marine engine temperatures
• OEM cross-reference 6S5-12121-00-00 for fitment confidence
• Designed to match original valve stem and head dimensions
• Manufactured to withstand continuous high-RPM operation

Fits These Machines

• for Yamaha 242 LTD S 1800 (2010-2019)

On-The-Job Use

• Top-end rebuilds on 1.8L marine engines
• Replacing burnt or leaking exhaust valves
• Routine valve service on Yamaha jet boats
• Restoring compression and exhaust efficiency

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: This is an aftermarket replacement valve, not an original Yamaha product, and it is referenced by OEM number 6S5-12121-00-00. Confirm your engine model and serial number before ordering.

Q: How many valves should I replace at once? A: Many mechanics recommend replacing all exhaust valves together during a top-end service for even wear. Check your service manual for the correct quantity for your engine.

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