420431801 Valve Cover Gasket for Sea-Doo GTS STDR HO 900 2017

Valve Cover Gasket for Sea-Doo

This valve cover gasket for Sea-Doo replaces OEM part 420431801, sealing the valve cover to the cylinder head to prevent oil leaks on GTS STDR HO 900 models.

Overview

This valve cover gasket for Sea-Doo is a direct-fit sealing component that keeps oil contained where the valve cover meets the cylinder head. It is designed to match the original 420431801 sealing profile so the cover seats evenly and holds pressure. Ideal for riders and mechanics servicing a Sea-Doo GTS STDR HO 900 who need a dependable replacement gasket.

Built For Performance

• Precision-cut to match OEM 420431801 sealing geometry
• Oil-resistant material stands up to heat cycling in marine engines
• Seals the valve cover mating surface to prevent oil seepage
• Flexible construction conforms to the cylinder head surface
• Direct replacement for the original gasket with no modification needed

Fits These Machines

• for Sea-Doo GTS STDR HO 900

On-The-Job Use

• Valve cover resealing during routine engine maintenance
• Leak repair on the cylinder head cover area
• Top-end service on personal watercraft engines
• Preventive replacement when the old gasket hardens or shrinks

Specs At A Glance

Good To Know

Q: What does this gasket actually seal? A: It seals the joint between the valve cover and the cylinder head, keeping oil from weeping out along that mating surface.

Q: Should I replace it if I only see a small leak? A: Yes, a small leak tends to spread as the gasket ages, so replacing it during top-end service saves repeat labor later.

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