420950772 Head Gasket for Sea-Doo RXT P XRS 300 1630 2018

Head Gasket for Sea-Doo

This head gasket for Sea-Doo closes the gap between the cylinder head and engine block, sealing combustion pressure and coolant on 1630cc 300-series powerplants; it references OEM part number 420950772.

Overview

This head gasket for Sea-Doo is a sealing component that sits between the cylinder head and cylinder block on the 1630cc engine used across the RXT P, X and XRS 300 lineup. It keeps combustion gases, coolant and oil separated under the high cylinder pressures these supercharged engines produce. It is intended for riders and mechanics rebuilding or refreshing a 300-horsepower Sea-Doo engine who need a dependable replacement head gasket.

Built For Performance

• Multi-layer steel construction built to handle the clamping loads of a boosted 1630cc engine
• Precision-cut openings matched to the 300-series cylinder head and block passages
• Designed to seal combustion gases and coolant simultaneously
• Cross-references OEM part number 420950772 for straightforward lookup
• Sold as a single head gasket for one engine rebuild

Fits These Machines

• for Sea-Doo RXT 300
• for Sea-Doo RXT P 300
• for Sea-Doo RXT X 300
• for Sea-Doo RXT XRS 300

On-The-Job Use

• Top-end rebuilds after a blown head gasket or overheating event
• Refreshing the cylinder head seal during scheduled engine service
• Reassembly after cylinder head removal on a 1630cc 300 engine
• Shop and DIY rebuilds where an OEM cross-reference is required

Specs At A Glance

Good To Know

Q: Do I need to replace head bolts at the same time? A: Many rebuilders replace torque-to-yield head bolts during a head gasket job, so check your service manual before reassembly.

Q: Is this an original Sea-Doo part? A: This is an aftermarket head gasket that cross-references OEM part number 420950772, not an original brand item.

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