420854358 Power Valve for Sea-Doo GTX 800 1996-1997

Power Valve for Sea-Doo

This power valve (OEM cross-reference 420854358) is a replacement exhaust component that regulates exhaust port timing on 800 series two-stroke engines, helping restore mid-range and top-end power delivery.

Overview

This power valve for Sea-Doo fits 800 series engines and controls the exhaust port height as RPM rises, sharpening the powerband on the water. The 420854358 power valve is a direct-fit replacement for worn or stuck valves on the GTX 800. It is intended for riders and mechanics servicing 1996 to 1997 Sea-Doo GTX 800 watercraft.

Built For Performance

• OEM cross-reference 420854358 for direct replacement fitment
• Machined valve body designed for 800 series two-stroke exhaust systems
• Controls exhaust port timing to support mid-range and top-end power
• Constructed for resistance to heat and exhaust gas exposure
• Replaces a stuck or seized valve that causes flat acceleration

Fits These Machines

• for Sea-Doo GTX 800, 1996
• for Sea-Doo GTX 800, 1997

On-The-Job Use

• Top-end rebuilds on 800 series two-stroke engines
• Restoring powerband response after valve seizure
• Routine exhaust system service on personal watercraft
• Seasonal maintenance for 1996 to 1997 GTX 800 models

Specs At A Glance

Good To Know

Q: How do I know if my power valve needs replacing? A: Common signs include sluggish acceleration, a flat spot in the powerband, or a valve that will not move freely when inspected. Confirm the valve cycles properly before installing a replacement.

Q: Is this an original Sea-Doo part? A: This is a replacement power valve made for Sea-Doo applications and cross-referenced to 420854358. Always verify the part number against your machine 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.