420950772 Head Gasket for Sea-Doo RXT STD 230 1503 2018-2019

Head Gasket for Sea-Doo RXT STD 230

This head gasket, part number 420950772, seals the cylinder head to the engine block on Sea-Doo RXT STD 230 1503 watercraft, keeping combustion compression and coolant passages contained.

Overview

This head gasket is a direct-fit sealing component for the Sea-Doo RXT STD 230 1503 engine, designed to hold compression at the cylinder head mating surface. It separates combustion gases from coolant and oil passages so the engine can run at consistent temperature and power. It suits owners performing a top-end rebuild or replacing a blown gasket on their 2018-2019 RXT STD 230.

Built For Performance

• Precision-cut to match the 1503 engine cylinder head bolt pattern
• Multi-layer construction resists heat and compression cycling
• Seals combustion, coolant, and oil passages in one component
• Withstands the high cylinder pressures of a supercharged-capable platform
• Direct replacement for OEM part number 420950772

Fits These Machines

• for Sea-Doo RXT STD 230 1503, 2018
• for Sea-Doo RXT STD 230 1503, 2019

On-The-Job Use

• Top-end rebuilds after overheating or gasket failure
• Cylinder head removal and reinstallation service
• Compression restoration on high-hour 1503 engines
• Preventive replacement during seasonal maintenance

Specs At A Glance

Good To Know

Q: Does this gasket require new head bolts during installation? A: Many manufacturers recommend fresh torque-to-yield head bolts, so check your service manual before reassembly. Reusing stretched bolts can cause uneven clamping and premature gasket failure.

Q: Can I install this gasket without machining the head surface? A: The head and block decks should be flat and clean before installation for a reliable seal. If the engine overheated, have the head checked for warpage first.

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