6S5-12121-00-00 Exhaust Valve for Yamaha 242 LTD S E-Series 1800 2016-2019

Exhaust Valve for Yamaha

This exhaust valve is a direct replacement component for Yamaha 1800 series marine engines, carrying OEM cross-reference 6S5-12121-00-00 for straightforward identification.

Overview

This exhaust valve for Yamaha is a precision-engineered engine component designed to regulate exhaust gas flow in 1800 series marine engines. The exhaust valve for Yamaha plays a critical role in maintaining proper compression and combustion cycles. Built to OEM-spec dimensions, this exhaust valve for Yamaha is suited to owners performing top-end engine service or rebuilds.

Built For Performance

• Manufactured to OEM cross-reference 6S5-12121-00-00 specifications
• Heat-resistant alloy construction for sustained high-RPM marine use
• Precision-ground stem and seat face for a tight seal
• Designed for 1800cc Yamaha marine engine platforms
• Direct drop-in fitment with no modification required

Fits These Machines

• for Yamaha 242 LTD S E-Series 1800 (2016-2019)
• for Yamaha 242 series 1800 engines using part 6S5-12121-00-00

On-The-Job Use

• Top-end rebuilds on Yamaha 1800 marine engines
• Valve replacement during cylinder head service
• Restoring compression on high-hour jet boat engines

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: No, this is an aftermarket replacement exhaust valve built to OEM specifications and cross-referenced to part number 6S5-12121-00-00. It is not manufactured by Yamaha.

Q: How many valves should I replace at once? A: It is common practice to inspect and replace valves as a set during a top-end service. Confirm the required quantity for your specific cylinder head before ordering.

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