6S5-12121-00-00 Exhaust Valve for Yamaha SX 250 1800 2021-2023 PWC

Exhaust Valve for Yamaha

This exhaust valve for Yamaha, part number 6S5-12121-00-00, manages exhaust gas flow out of the combustion chamber for reliable engine operation.

Overview

This exhaust valve is a direct-fit replacement for Yamaha SX 250 models from 2021 through 2023. It opens and closes at the correct point in the combustion cycle, helping preserve compression and engine output. Built for riders and mechanics performing top-end service or a full rebuild.

Built For Performance

• OEM cross-reference 6S5-12121-00-00 for precise fitment
• Constructed from heat-resistant alloy steel for high-temperature exhaust exposure
• Machined valve face for a reliable seal against the valve seat
• Designed to match original stem dimensions for drop-in installation
• Suited to high-rpm two-stroke engine operation

Fits These Machines

• for Yamaha SX 250 2021
• for Yamaha SX 250 2022
• for Yamaha SX 250 2023

On-The-Job Use

• Top-end rebuilds and cylinder head service
• Restoring compression on a worn or burnt valve
• Routine maintenance on high-hour SX 250 engines
• Performance refresh before race season

Specs At A Glance

Good To Know

Q: Is this valve an original Yamaha part? A: This is an aftermarket exhaust valve that cross-references OEM number 6S5-12121-00-00. Always verify your machine's part number before ordering.

Q: Should I replace valve seals at the same time? A: Replacing seals, guides, and retaining hardware during a valve job is good practice. Confirm all related part numbers for your specific machine.

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