420854449 Power Valve Piston for Sea-Doo SPX 800 1997-1999

Power Valve Piston for Sea-Doo SPX 800

This power valve piston is a replacement component for the exhaust power valve assembly on 1997-1999 Sea-Doo SPX 800 watercraft, cross-referencing OEM part number 420854449.

Overview

This power valve piston is a direct replacement for the exhaust power valve in Sea-Doo SPX 800 models from 1997 through 1999. The power valve piston regulates exhaust port timing as RPM rises, which helps the engine build power smoothly across the rev range. It is built for owners doing routine top-end maintenance on their Sea-Doo SPX 800 or anyone servicing a worn or sticking power valve.

Built For Performance

• Constructed to OEM dimensions for a direct fit into the power valve housing
• Designed to work with the 800 Rotax engine exhaust valve system
• Cross-references part number 420854449 for easy verification
• Precision-machined surface for consistent travel inside the valve bore
• Resists heat and carbon buildup common in two-stroke exhaust valves

Fits These Machines

• for Sea-Doo SPX 800 1997
• for Sea-Doo SPX 800 1998
• for Sea-Doo SPX 800 1999

On-The-Job Use

• Servicing exhaust power valves during routine top-end rebuilds
• Restoring proper exhaust port timing on high-hour 800 engines
• Replacing a stuck or carbon-fouled power valve piston
• Maintenance on personal watercraft used in fresh or salt water

Specs At A Glance

Good To Know

Q: Is this an original Sea-Doo part? A: This is an aftermarket replacement power valve piston that cross-references OEM part number 420854449, not an original Sea-Doo branded component.

Q: How many pistons should I order? A: The 800 Rotax engine uses one power valve piston per cylinder, so confirm how many cylinders you are servicing 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.