8GL-12121-10-00 Exhaust Valve for Yamaha YXZ-R SS 1000 2017-2025

Exhaust Valve for Yamaha

This exhaust valve, part number 8GL-12121-10-00, controls exhaust gas flow out of the combustion chamber in Yamaha YXZ-R SS 1000 machines from 2017 through 2025.

Overview

The exhaust valve for Yamaha YXZ-R SS 1000 is a direct-fit replacement component that seals and releases combustion gases at the correct point in the engine cycle. Built to the 8GL-12121-10-00 specification, this exhaust valve restores proper compression and exhaust timing in the YXZ-R SS 1000 engine. It suits riders and mechanics performing top-end service or a full engine rebuild.

Built For Performance

• Precision-ground valve face for a consistent seal against the valve seat
• Heat-resistant alloy construction suited to sustained exhaust temperatures
• Stem diameter machined to OEM specification for correct guide fit
• Hardened tip to resist wear from rocker or bucket contact
• Direct replacement for the 8GL-12121-10-00 exhaust valve

Fits These Machines

• for Yamaha YXZ-R SS 1000, 2017-2025

On-The-Job Use

• Top-end rebuilds after valve burn or compression loss
• Scheduled engine refresh on high-hour YXZ-R SS 1000 units
• Cylinder head service and valve seat grinding jobs
• Restoring exhaust flow and engine sealing after a failure

Specs At A Glance

Good To Know

Q: Should exhaust valves be replaced as a set? A: Replacing all exhaust valves together with new seals and lapping each to its seat is standard practice during a head rebuild. Mixing worn and new valves can lead to uneven sealing.

Q: Does this valve require lapping before installation? A: Many builders lap a new exhaust valve to verify seat contact and check valve margin. Confirm clearance and seat condition before final assembly.

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