6S5-12121-00-00 Exhaust Valve for Yamaha AR 195 1800 2017-2026

Exhaust Valve for Yamaha

This exhaust valve for Yamaha marine engines carries OEM cross-reference 6S5-12121-00-00 and manages exhaust gas flow from the combustion chamber on 1800 series powerplants.

Overview

This exhaust valve for Yamaha is a replacement engine component built for 1.8L marine engines, sealing the combustion chamber and releasing exhaust gases on each cycle. The exhaust valve for Yamaha 1800 applications serves boat owners and marine technicians handling top-end engine service. It offers a direct-fit solution when a factory valve is worn, burned, or leaking.

Built For Performance

• OEM cross-reference 6S5-12121-00-00 for accurate part matching
• Heat-resistant alloy steel construction for sustained marine exhaust temperatures
• Precision-ground face and stem for a reliable combustion seal
• Engineered for the 1800cc Yamaha marine engine family
• Drops into place as a direct replacement with no modification

Fits These Machines

• for Yamaha AR 195 1800, 2017-2026
• for Yamaha 1800 series marine engines

On-The-Job Use

• Cylinder head service on Yamaha 1800 jet boat engines
• Replacing burned exhaust valves after compression or leak-down issues
• Routine valve maintenance during top-end rebuilds
• Marine repair shops and owner-performed engine work

Specs At A Glance

Good To Know

Q: How can I confirm this valve matches my engine? A: Check that part number 6S5-12121-00-00 matches the valve in your 1800 series Yamaha engine before ordering.

Q: Is it wise to replace all exhaust valves at once? A: Replacing the full set during a top-end service keeps wear even and avoids a second teardown later.

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