420950772 Head Gasket for Sea-Doo Challenger SE 255 1503 2009-2011

Head Gasket for Sea-Doo Challenger SE 255 1503

This head gasket is a replacement sealing component designed to sit between the cylinder head and engine block on the 1503 engine, carrying OEM cross-reference 420950772.

Overview

This head gasket is built to seal the combustion chamber and coolant passages on the 1503 engine found in the Challenger SE 255. It helps maintain proper compression and prevents coolant or combustion gases from crossing between mating surfaces. A smart choice for riders and marine mechanics handling top-end service on this supercharged powerplant.

Built For Performance

• Precision-cut to match the 1503 cylinder head and block mating surfaces
• Constructed from gasket material rated for high-compression marine engine use
• Seals combustion, oil, and coolant passages in one component
• Direct replacement referencing OEM part 420950772
• Designed for a clean, even torque-down during reassembly

Fits These Machines

• for Sea-Doo Challenger SE 255 with 1503 engine, 2009-2011

On-The-Job Use

• Top-end rebuilds and cylinder head removal jobs
• Coolant leak repair at the head-to-block joint
• Compression loss diagnosis and repair
• Routine engine refresh on high-hour machines

Specs At A Glance

Good To Know

Q: Should I replace head bolts at the same time? A: Many manufacturers recommend new torque-to-yield head bolts on reassembly, so check your service manual before reusing originals.

Q: Do I need to resurface the head before installing this gasket? A: If the head or block shows warping or pitting, machining may be required so the gasket can seal properly.

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