420950772 Head Gasket for Sea-Doo Challenger SE 155 1503 2012 2 x 155

Head Gasket for Sea-Doo Challenger/SE

This head gasket seals the cylinder head to the engine block on 155 1503 engines, carrying the OEM cross-reference 420950772.

Overview

This head gasket is a sealing component made to fit the 155 1503 engine used in the Sea-Doo Challenger and SE models. It seals the joint between the cylinder head and block so compression and coolant stay where they belong. It suits riders performing top-end service or a full engine rebuild.

Built For Performance

• Precise cut to match the 1503 cylinder head and block mating surfaces
• Built to hold compression under load across the rev range
• Withstands the heat cycling of marine engine operation
• Seals coolant passages to help prevent leaks at the head joint
• Direct replacement for OEM part number 420950772

Fits These Machines

• for Sea-Doo Challenger 155 1503
• for Sea-Doo Challenger SE 155 1503

On-The-Job Use

• Top-end rebuilds after a blown head gasket
• Cylinder head removal and reinstallation
• Compression loss diagnosis and repair
• Coolant leak repairs at the head joint

Specs At A Glance

Good To Know

Q: Should I replace the head bolts at the same time? A: Torque-to-yield head bolts should not be reused once stretched, so fit new bolts if your service manual calls for them.

Q: Can I install this without machining the head? A: A warped or damaged head surface will prevent the gasket from sealing properly, so have the deck checked before assembly.

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