420850638 Exhaust Manifold Gasket for Sea-Doo GSI 720 1997

Exhaust Manifold Gasket for Sea-Doo

This exhaust manifold gasket for Sea-Doo replaces OEM 420850638 to seal the joint between the exhaust manifold and engine block on 720 series watercraft.

Overview

This exhaust manifold gasket for Sea-Doo is a direct-fit sealing component for 720 series marine engines. It creates a tight seal at the manifold joint, helping prevent exhaust leaks and protecting surrounding components from heat and moisture. Built for riders and mechanics doing routine top-end or exhaust service.

Built For Performance

• Engineered to seal the exhaust manifold joint under high-temperature operation
• Sold as a single gasket matching OEM reference 420850638
• Compact footprint sized for 720 series exhaust manifold flanges
• Suited to marine environments where moisture and heat cycling are constant

Fits These Machines

• for Sea-Doo GSI 720, 1997

On-The-Job Use

• Exhaust manifold reassembly after top-end service
• Leak repair at the manifold to engine joint
• Routine gasket replacement during engine refresh
• Shop or DIY repair on 720 series personal watercraft

Specs At A Glance

Good To Know

Q: Does this gasket fit other Sea-Doo models? A: This gasket is listed for the 1997 GSI 720 and matches OEM reference 420850638, so verify your model and serial number before ordering.

Q: Can I reuse the old gasket? A: Exhaust manifold gaskets are designed for single use, so a fresh gasket should be installed each time the manifold is removed.

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