420950772 Head Gasket for Sea-Doo LTD 21-230 1630 2024-2025

Head Gasket for Sea-Doo

This head gasket, part number 420950772, seals the cylinder head to the engine block on the Sea-Doo LTD 21-230 1630 for the 2024 and 2025 model years, keeping combustion pressure contained and coolant in its proper passages.

Overview

This head gasket for Sea-Doo is a direct-fit sealing component built for the LTD 21-230 1630 platform. It goes between the cylinder head and block to maintain compression and prevent coolant or oil from migrating where they do not belong. Engine builders and riders servicing a 2024 or 2025 machine will find this head gasket suited to top-end rebuild work.

Built For Performance

• Precision-cut to match the 1630 engine deck and combustion chamber openings
• Constructed to withstand the heat and pressure of a running marine engine
• Seals coolant passages to help prevent overheating and fluid loss
• Maintains cylinder compression for consistent power delivery
• Direct replacement for part number 420950772

Fits These Machines

• for Sea-Doo LTD 21-230 1630, 2024
• for Sea-Doo LTD 21-230 1630, 2025

On-The-Job Use

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

Specs At A Glance

Good To Know

Q: Should head bolts be replaced when installing this gasket? A: Many manufacturers specify new torque-to-yield head bolts for a proper seal. Check the service manual for your 1630 engine before reassembly.

Q: Is this gasket reusable if the engine has not been run? A: A head gasket is designed for a single installation and should be replaced any time the head is removed. Reusing one risks an inadequate seal.

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