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

Valve Cover Gasket for Sea-Doo

This valve cover gasket seals the valve cover to the cylinder head on Sea-Doo 1630 engine applications, and it carries OEM cross-reference 420950820 so you can match it to your original part number.

Overview

This valve cover gasket is a direct-fit sealing component for the 1630 engine used in Sea-Doo watercraft. It keeps oil contained at the valve cover mating surface and blocks dirt and moisture from entering the top end. The gasket suits riders and mechanics servicing 2026 Sea-Doo Cruise 21-300 models who want a dependable replacement seal.

Built For Performance

• OEM cross-reference 420950820 for straightforward part matching
• Precision-cut shape for a close fit on the valve cover mating surface
• Constructed to resist heat and oil exposure in marine engine conditions
• Seals the top end to help prevent oil seepage and contamination
• Sold as a single gasket for one valve cover installation

Fits These Machines

• for Sea-Doo Cruise 21-300 1630, 2026

On-The-Job Use

• Valve cover resealing during top-end maintenance
• Routine gasket replacement after oil weep is found
• Engine rebuilds and refresh work on 1630 powerplants
• Seasonal service before launching the watercraft

Specs At A Glance

Good To Know

Q: How do I know this gasket matches my engine? A: Compare the OEM number 420950820 against the part number on your existing gasket or in your service manual. The title lists fitment for the 2026 Cruise 21-300 with the 1630 engine.

Q: Should the valve cover bolts be retorqued after installation? A: Yes, tighten the cover fasteners to the torque figure listed in your service manual and recheck them after the first heat cycle. Correct torque helps the gasket seat evenly and seal properly.

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