420854354 Power Valve for Sea-Doo GSX RFI 800 1999-2001

Power Valve for Sea-Doo

This power valve, part number 420854354, is the exhaust valve component that regulates exhaust timing in the Rotax 800 RFI engine, helping maintain strong low-end response and top-end pull for Sea-Doo riders.

Overview

This power valve for Sea-Doo is a direct-fit replacement for the exhaust timing valve used on GSX RFI 800 models from 1999 to 2001. The power valve controls the exhaust port height, which sharpens acceleration off idle while keeping top-end power strong across the RPM range. It suits riders maintaining or rebuilding a Sea-Doo 800 RFI engine who need a dependable valve for part number 420854354.

Built For Performance

• Direct replacement for part number 420854354
• Controls exhaust port timing for stronger mid-range power
• Designed for the Rotax 800 RFI engine platform
• Constructed from durable metal for marine exhaust conditions
• Helps restore factory valve response when originals wear

Fits These Machines

• for Sea-Doo GSX RFI 800, 1999-2001

On-The-Job Use

• Top-end and mid-range rebuilds on GSX RFI 800 watercraft
• Restoring exhaust valve function on high-hour 800 RFI engines
• Routine power valve maintenance and cleaning replacements

Specs At A Glance

Good To Know

Q: Does this power valve fit both GSX RFI 800 and other 800 RFI models? A: This listing covers the GSX RFI 800 from 1999 to 2001, so confirm your model and serial number before ordering. A: Engaging the correct part, ensuring it matches the exact model and year of your watercraft.

Q: Do I need to replace both valves at the same time? A: Many riders replace power valves in pairs since they wear at similar rates under the same operating conditions. Match this part number 420854354 against your engine 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.