420950772 Head Gasket for Sea-Doo Cruise 21-300 1630 2026

Head Gasket for Sea-Doo Cruise 21-300 1630

This head gasket seals the cylinder head to the engine block on the Sea-Doo Cruise 21-300 1630, cross-referenced as 420950772, keeping combustion pressure contained and coolant passages sealed.

Overview

This head gasket for Sea-Doo is a replacement sealing component for the 1630 engine found in the Cruise 21-300. It maintains compression at the head-to-block joint while separating coolant and oil channels. Intended for riders and technicians servicing 2026 model year machines.

Built For Performance

• Precision-cut to match the 1630 engine deck and head surfaces
• Multi-layer construction resists heat and combustion pressure
• Seals coolant and oil passages to prevent cross-contamination
• Withstands the thermal cycling of marine engine operation
• Cross-references OEM part number 420950772

Fits These Machines

• for Sea-Doo Cruise 21-300 1630, 2026

On-The-Job Use

• Top-end rebuilds after overheating or compression loss
• Cylinder head removal and reinstallation service
• Coolant leak repair at the head-to-block joint
• Routine engine refresh on high-hour personal watercraft

Specs At A Glance

Good To Know

Q: Do I need to replace head bolts when installing this gasket? A: Many torque-to-yield head bolts should not be reused, so check your service manual before reassembly. New bolts help ensure even clamping force across the gasket.

Q: Can this gasket be reused if the head is removed again? A: Head gaskets are designed for single use and should be replaced any time the head is lifted. Reusing one risks compression loss and coolant leaks.

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