290931440 Rotary Valve O-Ring for Sea-Doo Sportster 720 1996-1997

Rotary Valve O-Ring for Sea-Doo Sportster 720

This rotary valve O-ring is a replacement sealing component for the 720 engine used in 1996-1997 Sea-Doo Sportster models, cross-referencing OEM part 290931440.

Overview

This rotary valve O-ring for Sea-Doo Sportster 720 models provides the critical seal at the rotary valve cover, helping maintain proper crankcase sealing on 1996-1997 720 engines. The rotary valve O-ring for Sea-Doo Sportster 720 restores a worn or flattened seal so the engine can draw fuel mixture correctly. It suits riders and mechanics servicing these classic two-stroke machines.

Built For Performance

• Direct cross-reference to OEM part 290931440 for confident replacement
• Seals the rotary valve cover against crankcase pressure loss
• Resists fuel, oil, and two-stroke mix exposure
• Restores proper intake sealing for consistent running
• Compact size for straightforward installation during top-end service

Fits These Machines

• for Sea-Doo Sportster 720, 1996
• for Sea-Doo Sportster 720, 1997

On-The-Job Use

• Rotary valve cover resealing during engine service
• Top-end rebuilds on 720 two-stroke powerplants
• Routine replacement of hardened or flattened O-rings
• Fixing air leaks that cause lean running or hard starting

Specs At A Glance

Good To Know

Q: How do I know if my rotary valve O-ring needs replacing? A: Hard starting, lean running, or a flattened, hardened ring found during teardown are common signs. Replacing it during rotary valve service is a practical step.

Q: Does this O-ring fit both 1996 and 1997 Sportster 720 models? A: It is listed for the 1996-1997 Sportster 720 range using this part number. Confirm your engine and serial number 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.