6S5-12121-00-00 Exhaust Valve for Yamaha 252SD 1800 2021-2023

Exhaust Valve for Yamaha 252SD

This exhaust valve, reference 6S5-12121-00-00, controls exhaust flow in the 1800 engine used across 2021-2023 Yamaha 252SD models.

Overview

This exhaust valve is a replacement component for the Yamaha 252SD equipped with the 1800 engine. The exhaust valve opens and closes at the right moment to release combustion gases, helping the engine breathe and run cleanly. It suits owners maintaining or rebuilding a 2021-2023 Yamaha 252SD who need a fresh valve that matches the original fit.

Built For Performance

• Direct replacement for OEM reference 6S5-12121-00-00
• Precision-ground valve face for a clean seal against the seat
• Heat-resistant alloy construction suited to exhaust temperatures
• Stem dimensions matched to the 1800 cylinder head guide
• Designed to maintain proper compression and exhaust flow

Fits These Machines

• for Yamaha 252SD 1800 (2021-2023)

On-The-Job Use

• Top-end engine rebuilds on the 1800 powerplant
• Replacing a burned or leaking exhaust valve
• Routine maintenance for high-hour 252SD boats
• Restoring compression and exhaust sealing

Specs At A Glance

Good To Know

Q: Does this valve fit the 1800 engine in the 252SD? A: Yes, it is listed for the 2021-2023 Yamaha 252SD with the 1800 engine and matches reference 6S5-12121-00-00.

Q: Should valves be replaced as a set? A: Replacing all exhaust valves at once is common practice during a top-end rebuild to keep wear consistent across the head.

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