6S5-12121-00-00 Exhaust Valve for Yamaha SX 190 1800 2012-2023

Exhaust Valve for Yamaha

This exhaust valve for Yamaha personal watercraft replaces OEM part number 6S5-12121-00-00 and controls exhaust gas flow through the engine.

Overview

This exhaust valve for Yamaha is a direct replacement component for the 1800cc engine family. The exhaust valve for Yamaha seals combustion gases during the exhaust stroke and helps maintain proper compression for consistent power delivery. It suits riders performing top-end service or rebuilding a worn cylinder head.

Built For Performance

• Constructed from heat-resistant alloy steel to handle high exhaust temperatures
• Machined head and stem dimensions for a precise fit in the cylinder head guide
• Stem profile designed to work with standard valve seals
• Manufactured to OEM cross-reference 6S5-12121-00-00 specifications
• Suited to 1800cc four-stroke marine engine applications

Fits These Machines

• for Yamaha SX 190 (2012-2023)
• for Yamaha 1800 series models using the 6S5-12121-00-00 exhaust valve

On-The-Job Use

• Top-end engine rebuilds on 1800cc personal watercraft
• Cylinder head service when exhaust valves show wear or sealing loss
• Restoring compression on high-hour marine engines
• Routine valve replacement during scheduled engine maintenance

Specs At A Glance

Good To Know

Q: Does this valve fit my engine model? A: It is listed for Yamaha SX 190 and 1800 applications using part number 6S5-12121-00-00, so confirm your model and serial number before ordering.

Q: Should I replace valves individually or as a set? A: Most engine builders replace all exhaust valves together during a top-end rebuild to keep wear even across the cylinder head.

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