6S5-12121-00-00 Exhaust Valve for Yamaha 252 FSH Sport 1900 2024-2026

Exhaust Valve for Yamaha

This exhaust valve, reference 6S5-12121-00-00, regulates exhaust flow in the cylinder head of Yamaha 1900 marine engines.

Overview

This exhaust valve for Yamaha fits 252 FSH Sport 1900 models from 2024 to 2026 and serves as a direct replacement for worn or damaged valves in the engine's exhaust path. Built to match original specifications, this exhaust valve for Yamaha restores proper sealing and compression so the engine breathes and runs the way it should. It is intended for boat owners and marine mechanics handling routine top-end service.

Built For Performance

• Precision-ground valve face for a clean seal against the seat
• Heat-resistant alloy construction suited to continuous marine exhaust temperatures
• Stem dimensions matched to 6S5-12121-00-00 specifications
• Designed to hold compression and support consistent combustion
• Direct-fit replacement for the listed Yamaha engine family

Fits These Machines

• for Yamaha 252 FSH Sport 1900, 2024-2026

On-The-Job Use

• Top-end rebuilds and valve replacement service
• Restoring compression on high-hour marine engines
• Routine maintenance before the boating season
• Shop repair work on Yamaha jet boat powerplants

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: No, this is an aftermarket exhaust valve made to fit Yamaha engines and cross-references the 6S5-12121-00-00 number. Always confirm your engine code before ordering.

Q: How many valves should I replace at once? A: Exhaust valves are commonly serviced as a set during a top-end rebuild. Check valve guides and seats at the same time for the best result.

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