420950772 Head Gasket for Sea-Doo GTX 155 1503 2008-2016

Head Gasket for Sea-Doo GTX 155 1503

This head gasket is designed to seal the cylinder head to the engine block on the Sea-Doo GTX 155 1503 and is a direct replacement referencing OEM number 420950772.

Overview

This head gasket for Sea-Doo is a sealing component that sits between the cylinder head and engine block on the GTX 155 1503 platform. It maintains compression and keeps coolant and oil where they belong during operation. Built for riders and mechanics servicing 2008 through 2016 model years who need a reliable replacement head gasket.

Built For Performance

• Precision cut to match the 1503 engine head and cylinder mating surfaces
• Constructed from multi-layer steel for consistent sealing under heat and pressure
• Withstands the high compression and thermal cycling of the 1503 four-stroke engine
• Helps maintain proper compression for consistent power delivery
• Designed to seal coolant and oil passages between head and block
• Cross-references OEM part number 420950772

Fits These Machines

• for Sea-Doo GTX 155 1503, 2008-2016

On-The-Job Use

• Top-end rebuilds after removing the cylinder head
• Replacing a blown or leaking head gasket causing compression loss
• Routine engine service on the 1503 four-stroke platform
• Coolant or oil leak repairs at the head-to-block joint

Specs At A Glance

Good To Know

Q: Do I need to replace head bolts when installing this gasket? A: Many manufacturers recommend new torque-to-yield head bolts for the 1503 engine, so check your service manual before reassembly. Reusing worn bolts can affect clamping force and sealing.

Q: What else should I inspect while the head is off? A: Check the cylinder head and block surfaces for flatness, and inspect the head bolts and cooling passages for corrosion. Clean mating surfaces thoroughly before installing the new gasket.

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