420950772 Head Gasket for Sea-Doo Fish 21-230 1630 2025-2026

Head Gasket for Sea-Doo Fish 21-230 1630 (2025-2026)

This head gasket (OEM cross-reference 420950772) seals the cylinder head to the engine block on the Sea-Doo Fish 21-230 1630, keeping compression in and coolant out. It is the replacement sealing component that restores a proper combustion chamber seal on the 1630 engine.

Overview

This head gasket for Sea-Doo fits the Fish 21-230 1630 and seals the joint between cylinder head and engine block. The head gasket for Sea-Doo is built to hold compression and separate coolant and oil passages under heat and pressure. It suits riders replacing a blown or weeping gasket on 2025 and 2026 models.

Built For Performance

• Multi-layer steel construction resists combustion heat and pressure
• Precise cutouts line up with coolant and oil passages
• Compresses evenly to maintain a tight cylinder head seal
• Designed to match the 1630 engine bore and head pattern
• Withstands repeated heat cycles without losing clamping force

Fits These Machines

• for Sea-Doo Fish 21-230 1630, 2025-2026

On-The-Job Use

• Top-end rebuilds after overheating or gasket failure
• Cylinder head removal and reinstallation jobs
• Compression restoration on the 1630 engine
• Routine engine teardown and inspection

Specs At A Glance

Good To Know

Q: Does this head gasket need any sealant? A: Most multi-layer steel head gaskets install dry and rely on their coating to seal. Follow the service manual torque sequence and values for the 1630 engine.

Q: Should the head bolts be replaced at the same time? A: Torque-to-yield head bolts should not be reused and are commonly replaced during a head gasket job. Check the manual for your Fish 21-230 before reassembly.

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