8GL-12121-10-00 Exhaust Valve for Yamaha YXZ-R SS XT-R 1000 2020-2025

Exhaust Valve for Yamaha

This exhaust valve for Yamaha YXZ-R SS XT-R 1000 side-by-side models controls exhaust gas flow out of the combustion chamber and carries OEM cross-reference 8GL-12121-10-00.

Overview

This exhaust valve for Yamaha is a direct-fit engine component that seals the exhaust port during combustion and opens on the exhaust stroke to release burned gases. Built to OEM cross-reference 8GL-12121-10-00, it serves riders rebuilding a top end or replacing a burned or bent valve in a Yamaha YXZ-R SS XT-R 1000. It suits DIY mechanics and shop technicians working on 2020 through 2025 machines.

Built For Performance

• Constructed from heat-resistant alloy steel to withstand high exhaust temperatures
• Precision-ground stem diameter for consistent valve guide fit
• Machined face angle for proper sealing against the valve seat
• Hardened tip to resist wear from rocker arm contact
• OEM cross-reference 8GL-12121-10-00 for direct replacement

Fits These Machines

• for Yamaha YXZ-R SS 1000, 2020-2025
• for Yamaha YXZ-R XT-R 1000, 2020-2025

On-The-Job Use

• Top-end rebuilds after valve damage or valve seat wear
• Routine engine refresh on high-hour trail and dune machines
• Performance builds paired with head porting or valve jobs
• Repair work following a dropped valve or timing failure

Specs At A Glance

Good To Know

Q: Should exhaust valves be replaced in sets? A: Most engine builders replace all exhaust valves together along with seals and guides so wear stays even across the head.

Q: Do I need to check valve clearance after installation? A: Yes, clearances should be measured and set to the factory spec after the head is reassembled and torqued.

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