6S5-12121-00-00 Exhaust Valve for Yamaha 212XD 1800 2021-2022

Exhaust Valve for Yamaha

This exhaust valve for Yamaha marine engines carries OEM cross-reference 6S5-12121-00-00 and controls exhaust gas flow out of the cylinder head on 1800 series boats.

Overview

This exhaust valve for Yamaha is a direct-fit replacement for the 6S5-12121-00-00 valve used in 1800 series marine engines. It seals combustion pressure during the power stroke and opens to release exhaust gases, keeping the engine breathing correctly. Built for boat owners and marine mechanics servicing Yamaha 212XD models from 2021 to 2022.

Built For Performance

• Precision-ground valve face for a clean seal against the valve seat
• Heat-resistant alloy construction suited to continuous marine exhaust temperatures
• Exact stem diameter for a correct fit in the factory valve guide
• Cross-references OEM part number 6S5-12121-00-00
• Direct replacement for worn or burnt exhaust valves

Fits These Machines

• for Yamaha 212XD 1800, 2021-2022
• for Yamaha 212SE 1800, 2021-2022 (same 6S5-12121-00-00 valve)

On-The-Job Use

• Top-end engine rebuilds on 1800 series marine engines
• Valve replacement after compression loss or burnt valve diagnosis
• Routine cylinder head service and valve lash adjustment jobs
• Marine shops servicing Yamaha 212XD and 212SE boats

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: This is an aftermarket exhaust valve built to match OEM part number 6S5-12121-00-00, not an original Yamaha product.

Q: How many valves come in one order? A: Each order covers one exhaust valve, so confirm how many cylinders you are servicing before ordering.

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