6S5-12121-00-00 Exhaust Valve for Yamaha AR 250 1900 2024-2026

Exhaust Valve for Yamaha

This exhaust valve (OEM cross-reference 6S5-12121-00-00) controls exhaust gas flow in the cylinder head of Yamaha AR 250 1900 watercraft.

Overview

This exhaust valve is a direct replacement component for the Yamaha AR 250 1900, built to seal combustion gases and release them through the exhaust port. It is intended for riders and mechanics performing top-end service on a Yamaha AR 250 1900 from the 2024 through 2026 model years. Each valve is manufactured to match the 6S5-12121-00-00 specification for fit and function.

Built For Performance

• Precision-ground valve face for a consistent seal against the valve seat
• Heat-resistant alloy construction suited to exhaust-side temperatures
• Stem diameter machined to OEM tolerances for proper guide fit
• Direct cross-reference to 6S5-12121-00-00 for simplified ordering
• Balanced to reduce valvetrain vibration at high RPM

Fits These Machines

• for Yamaha AR 250 1900, 2024
• for Yamaha AR 250 1900, 2025
• for Yamaha AR 250 1900, 2026

On-The-Job Use

• Top-end rebuilds after compression loss or valve damage
• Cylinder head service on the Yamaha AR 250 1900
• Routine replacement during valve clearance adjustment
• Restoring exhaust sealing after overheating or carbon buildup

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: No, it is an aftermarket exhaust valve manufactured to cross-reference 6S5-12121-00-00. It is not produced or branded by Yamaha.

Q: How many valves should I order for a top-end service? A: Valve work is typically done per cylinder, so match the quantity to the number of exhaust valves being replaced. Check your service manual for the correct 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.