420950772 Head Gasket for Sea-Doo GTI SE 155 1503 2008-2017

Head Gasket for Sea-Doo GTI SE 155 1503

This head gasket for Sea-Doo seals the joint between the cylinder head and engine block on the 1503 engine, restoring compression and preventing coolant and combustion leaks, and it cross-references OEM part number 420950772.

Overview

This head gasket for Sea-Doo is a direct-fit sealing component for the 1503 engine used in the GTI SE 155. It seals the cylinder head to the engine block so compression stays where it belongs and coolant stays out of the combustion chamber. It is built for riders and mechanics doing a top-end rebuild or replacing a blown gasket.

Built For Performance

• Precision-cut to match the 1503 cylinder head and block mating surfaces
• Multi-layer construction designed to handle high combustion pressure
• Withstands the heat cycling of a marine engine under load
• Seals coolant passages to prevent cross-contamination with combustion gases
• Cross-references OEM part number 420950772

Fits These Machines

• for Sea-Doo GTI SE 155 with 1503 engine, 2008 to 2017

On-The-Job Use

• Top-end rebuilds after a blown head gasket
• Coolant leak repair at the cylinder head joint
• Compression restoration on high-hour 1503 engines
• Routine tear-down service on the GTI SE 155

Specs At A Glance

Good To Know

Q: Does this gasket require new head bolts? A: Torque-to-yield head bolts should be replaced whenever the head is removed, since they stretch and will not hold proper clamping force a second time. Follow the factory torque sequence and spec for the 1503 engine.

Q: Can I reuse this head gasket if I only removed the head to inspect? A: No, a head gasket is a single-use crush gasket and should not be reinstalled once compressed. Fit a fresh gasket any time the cylinder head is lifted off the block.

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