420950772 Head Gasket for Sea-Doo Islandia SE 155 1503 2007

Head Gasket for Sea-Doo

This head gasket for Sea-Doo Islandia and SE 155 1503 models is an OEM cross-reference 420950772 sealing component that sits between the cylinder head and engine block to maintain compression and keep coolant and oil in their proper passages.

Overview

This head gasket for Sea-Doo is a direct-fit sealing solution for the 1503 engine platform used in the Islandia and SE 155 series. The head gasket 420950772 seals the combustion chamber interface, helping maintain proper compression and preventing coolant or oil from mixing. It is intended for riders and mechanics performing top-end service on a 2007 Sea-Doo Islandia or SE 155 1503.

Built For Performance

• OEM cross-reference part number 420950772 for exact fitment matching
• Multi-layer construction designed to withstand high combustion pressures
• Precision-cut openings for coolant and oil passages
• Heat-resistant material suited to the 1503 engine's operating temperatures
• Seals the head-to-block joint to preserve compression
• Engineered for the Sea-Doo 155 horsepower 1503 four-stroke platform

Fits These Machines

• for Sea-Doo Islandia 155 with 1503 engine, 2007
• for Sea-Doo SE 155 with 1503 engine, 2007

On-The-Job Use

• Top-end rebuilds after overheating or compression loss
• Cylinder head removal and reinstallation service
• Routine engine refresh on high-hour 1503 powerplants
• Repair work following coolant or oil contamination between head and block

Specs At A Glance

Good To Know

Q: Do I need to replace head bolts when installing this gasket? A: Many 1503 top-end jobs call for new torque-to-yield head bolts, so check your service manual before reuse. Always torque the head in the specified sequence and stages.

Q: Can this gasket be reused if the head is removed again? A: No, a head gasket is a single-use sealing component and should be replaced any time the cylinder head is lifted. Reusing it risks compression loss and coolant leaks.

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