420854449 Power Valve Piston for Sea-Doo Speedster 800 1998-1999

Power Valve Piston for Sea-Doo

This power valve piston for Sea-Doo replaces OEM 420854449 and keeps the RAVE exhaust valve cycling correctly on Speedster 800 models.

Overview

The power valve piston is a small but critical part of the RAVE exhaust valve system on Sea-Doo 800 engines. It moves the valve guillotine to tune exhaust port timing for stronger low-end and top-end performance. This replacement power valve piston fits 1998 to 1999 Sea-Doo Speedster 800 applications.

Built For Performance

• Direct replacement for OEM part number 420854449
• Manufactured to factory dimensions for correct valve travel
• Works with the RAVE exhaust valve assembly on 800 series engines
• Durable construction to handle constant exhaust heat cycling
• Sold individually for targeted replacement

Fits These Machines

• for Sea-Doo Speedster 800, 1998
• for Sea-Doo Speedster 800, 1999

On-The-Job Use

• Rebuilding a RAVE valve that has seized or worn out
• Restoring proper exhaust valve movement after a top-end service
• Routine maintenance on 800 series Rotax marine engines
• Repairing sluggish acceleration caused by a stuck power valve

Specs At A Glance

Good To Know

Q: How many pistons come in one order? A: This listing is for a single power valve piston, so order the quantity you need for your rebuild. Many riders replace both sides at once for even wear.

Q: Do I need any other parts when replacing this piston? A: It is wise to inspect the valve guillotine, housing, and bellows while the engine is apart. Replacing worn seals or gaskets at the same time helps avoid a repeat teardown.

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