6S5-12121-00-00 Exhaust Valve for Yamaha 222 FSH Sport 1800 2023

Exhaust Valve for Yamaha

This exhaust valve for Yamaha marine engines is a direct replacement component that controls exhaust gas flow through the cylinder head, and it cross-references OEM part number 6S5-12121-00-00.

Overview

This exhaust valve for Yamaha is designed to seal combustion gases and release them at the correct point in the engine cycle. It serves as a drop-in replacement for worn or burned valves in 1800 series marine engines. Boaters and marine mechanics handling scheduled top-end service will find this exhaust valve for Yamaha a practical choice for restoring proper compression and exhaust flow.

Built For Performance

• Constructed from heat-resistant alloy steel suited to sustained marine exhaust temperatures
• Precision-ground valve face for a consistent seal against the valve seat
• Stem dimensions held to OEM tolerances for correct guide fitment
• Cross-references OEM part number 6S5-12121-00-00
• Designed for the 1800 engine platform used across Yamaha jet boat models

Fits These Machines

• for Yamaha 222 FSH Sport 1800 (2023)
• for Yamaha 212XE 1800 (2021-2022)

On-The-Job Use

• Cylinder head rebuilds on Yamaha 1800 marine engines
• Replacing burned or leaking exhaust valves during top-end service
• Routine valve clearance adjustment and inspection work
• Marine engine repair shops servicing jet boat powerplants

Specs At A Glance

Good To Know

Q: Does this valve fit both the 222 FSH Sport and the 212XE? A: Yes, the 6S5-12121-00-00 exhaust valve is listed for both the 2023 222 FSH Sport 1800 and the 2021-2022 212XE 1800. Always confirm your engine serial number before ordering.

Q: Should exhaust valves be replaced individually or as a set? A: Marine engine builders typically recommend replacing valves as a full set when performing a cylinder head rebuild. Mixing new and worn valves can lead to uneven sealing and compression.

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