6S5-12121-00-00 Exhaust Valve for Yamaha 242 LTD 1800 2010-2017

Exhaust Valve for Yamaha

This exhaust valve, part number 6S5-12121-00-00, controls exhaust flow through the engine and is built to replace a worn or failed valve in the Yamaha 242 LTD 1800.

Overview

This exhaust valve for Yamaha is a direct-fit replacement designed to restore proper exhaust sealing and flow in the 242 LTD 1800. Built to keep combustion gases moving correctly through the engine, this exhaust valve for Yamaha helps maintain reliable power and smooth operation on the water. This exhaust valve suits owners performing routine top-end service or replacing a damaged component.

Built For Performance

• Manufactured to OEM cross-reference 6S5-12121-00-00 for a precise fit
• Engineered for reliable sealing under high-temperature exhaust conditions
• Constructed from heat-resistant alloy suited to marine engine use
• Machined stem and face for consistent valve seating
• Designed to withstand continuous high-RPM operation

Fits These Machines

• for Yamaha 242 LTD 1800, 2010-2017

On-The-Job Use

• Top-end engine rebuilds and valve replacement
• Routine maintenance on the 242 LTD 1800
• Restoring compression and exhaust flow after valve wear
• Marine engine service and repair

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: This is an aftermarket exhaust valve that cross-references OEM part number 6S5-12121-00-00 and is not manufactured by Yamaha. Confirm your engine uses this part number before ordering.

Q: How many valves do I need? A: The quantity required depends on your engine configuration and how many valves you are replacing. Check your service manual or existing valve count 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.