420950820 Valve Cover Gasket for Sea-Doo Sport 21-300 1630 2026

Valve Cover Gasket for Sea-Doo

This valve cover gasket seals the valve cover to the cylinder head on select Sea-Doo 1630 engine applications, replacing OEM part 420950820 to keep oil contained and prevent leaks.

Overview

This valve cover gasket is a direct-fit sealing component for Sea-Doo personal watercraft running the 1630 engine platform. It seats between the valve cover and cylinder head to hold oil in and keep contaminants out on Sport 21-300 models for 2026. A sound valve cover gasket is essential for maintaining proper oil pressure and a clean engine bay.

Built For Performance

• Precision-cut to match the OEM 420950820 sealing profile
• Constructed from oil-resistant gasket material for long service life
• Maintains a tight seal under the heat and vibration of marine use
• Direct replacement for worn, hardened, or leaking original gaskets
• Designed specifically for the Sea-Doo 1630 engine platform

Fits These Machines

• for Sea-Doo Sport 21-300 1630, 2026

On-The-Job Use

• Routine top-end resealing during valve clearance service
• Fixing oil seepage around the valve cover
• Rebuilds and refresh work on 1630 engine watercraft
• Preventive maintenance before the riding season

Specs At A Glance

Good To Know

Q: How do I know if my valve cover gasket needs replacing? A: Oil weeping around the valve cover, a burning oil smell, or visible gasket hardening are common signs. Replacing it during top-end service is the most reliable approach.

Q: Is this an original Sea-Doo part? A: No, this is an aftermarket replacement made to fit Sea-Doo 1630 applications and cross-references OEM part 420950820. Confirm your engine and part 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.