6S5-12121-00-00 Exhaust Valve for Yamaha GP HO 1900 2024-2026

Exhaust Valve for Yamaha

This exhaust valve (OEM cross-reference 6S5-12121-00-00) controls exhaust gas flow in the engine, sealing and opening at the right moment to keep combustion efficient and power delivery smooth.

Overview

This exhaust valve is a direct-fit replacement for the specified Yamaha watercraft applications, identified by OEM cross-reference 6S5-12121-00-00. It restores proper sealing and timing in the exhaust path so the engine breathes correctly. This exhaust valve suits riders replacing a worn or burnt valve on the GP HO 1900 platform.

Built For Performance

• OEM cross-reference 6S5-12121-00-00 for straightforward matching
• Built to handle the heat and stress of marine exhaust flow
• Precision-formed head and stem for consistent sealing
• Stable valve seat contact for reliable compression
• Constructed from heat-resistant alloy suited to continuous engine operation

Fits These Machines

• for Yamaha GP HO 1900, 2024-2026

On-The-Job Use

• Top-end rebuilds on the GP HO 1900 engine
• Replacing a burnt or leaking exhaust valve
• Routine valve service and clearance adjustment
• Restoring compression on a high-hour watercraft

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: It is an aftermarket exhaust valve that cross-references OEM number 6S5-12121-00-00, so it is not an original brand item. Confirm your model and serial number before ordering.

Q: How many valves do I need? A: Quantity depends on how many exhaust valves your engine uses and which ones you are replacing. Check your service manual or count the valves being serviced before you buy.

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