Rotary Valve for Sea-Doo GS 720 1998-2001

Rotary Valve for Sea-Doo

This rotary valve is an intake timing component for Sea-Doo GS 720 watercraft produced between 1998 and 2001, controlling the opening and closing of the intake ports as the engine spins.

Overview

This rotary valve serves as the intake timing disc for Sea-Doo GS 720 personal watercraft from the 1998 through 2001 model years. It rotates with the crankshaft to open and close the intake ports at the correct interval, which directly affects how the engine breathes and runs. It is intended for riders and mechanics servicing or rebuilding a 720 engine in a GS hull.

Built For Performance

• Precision-cut port openings timed for the 720 engine's intake sequence
• Flat, true surface for a clean seal against the rotary valve cover
• Construction suited to continuous contact with fuel and oil mist
• Designed as a direct replacement for the stock rotary valve disc
• Balanced to spin with the crankshaft without adding vibration

Fits These Machines

• for Sea-Doo GS 720, 1998
• for Sea-Doo GS 720, 1999
• for Sea-Doo GS 720, 2000
• for Sea-Doo GS 720, 2001

On-The-Job Use

• Top-end and full engine rebuilds on 720-powered GS watercraft
• Restoring intake timing after a valve or cover failure
• Routine refresh during off-season maintenance
• Shop service work on 1998 to 2001 GS models

Specs At A Glance

Good To Know

Q: Does the rotary valve need to be timed when installed? A: Yes, the disc has a specific opening point relative to the crankshaft, so it must be indexed correctly during assembly. Follow the service manual procedure for your 720 engine to set it.

Q: Can I reuse the old cover gasket or O-ring? A: It is best to fit new sealing components when the rotary valve is replaced, since a worn seal can cause air leaks and poor running. Check the cover surface for scoring while it is apart.

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