420854449 Power Valve Piston for Sea-Doo RX 951 2000-2002

Power Valve Piston for Sea-Doo

This power valve piston for Sea-Doo 951 RX models matches OEM part number 420854449, delivering the sliding valve action that controls exhaust port timing in the Rotax 951 engine.

Overview

This replacement power valve piston for Sea-Doo fits the 951 engine used in the RX from 2000 through 2002. It restores the variable exhaust timing that keeps low-end torque strong while letting the engine breathe at wide open throttle. Built for riders replacing a worn or seized valve piston during top-end service.

Built For Performance

• Direct replacement for OEM part number 420854449
• Machined to match the original valve piston profile
• Slides cleanly in the valve housing for consistent port timing
• Designed for the Rotax 951 two-stroke engine
• Sold as a single piston for one valve position

Fits These Machines

• for Sea-Doo RX 951, 2000
• for Sea-Doo RX 951, 2001
• for Sea-Doo RX 951, 2002

On-The-Job Use

• Top-end rebuilds on the 951 engine
• Replacing a sticking or carbon-seized valve piston
• Restoring exhaust valve response after a season of use
• Servicing power valves before seasonal lake or coastal riding

Specs At A Glance

Good To Know

Q: How many of these do I need for one engine? A: The 951 uses one piston per valve position, so order according to the number of valves you are servicing. Inspect the valve housing and spring while the engine is apart.

Q: Can I reuse the old valve components? A: Reusing worn guides or springs can cause the new piston to stick again. Replace related parts that show scoring or heavy carbon buildup.

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