420950772 Head Gasket for Sea-Doo GTX STD 155 1503 2017

Head Gasket for Sea-Doo GTX STD 155

This head gasket, part number 420950772, is a sealing component designed to sit between the cylinder head and engine block on the 1503 engine used in 2017 Sea-Doo GTX STD 155 watercraft.

Overview

This head gasket for Sea-Doo serves as the critical seal between the cylinder head and engine block, preventing coolant and combustion gases from escaping. Built as a direct replacement for part number 420950772, this head gasket keeps compression where it belongs for the 1503 engine. Riders and mechanics maintaining a 2017 Sea-Doo GTX STD 155 will find this head gasket an essential part for top-end engine work.

Built For Performance

• Direct replacement for OEM part number 420950772
• Precision-cut to match the 1503 engine cylinder head and block mating surfaces
• Constructed from heat-resistant material suited to marine engine temperatures
• Seals combustion gases and coolant passages against leakage
• Designed for consistent compression across the cylinder head joint

Fits These Machines

• for Sea-Doo GTX STD 155 1503, 2017

On-The-Job Use

• Top-end engine rebuilds on 1503-equipped personal watercraft
• Cylinder head removal and reinstallation jobs
• Coolant and compression leak repairs at the head joint
• Routine maintenance on 2017 GTX STD 155 models

Specs At A Glance

Good To Know

Q: Does this head gasket require any sealant during installation? A: Most head gaskets of this type are designed to be installed dry on clean, flat mating surfaces unless the service manual specifies otherwise. Always follow the manufacturer torque sequence for the cylinder head bolts.

Q: Can I reuse this head gasket if I remove the cylinder head again? A: A head gasket is a single-use item and should be replaced any time the cylinder head is removed. Reusing a compressed gasket can lead to coolant or compression leaks.

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