420834488 Starter Gear for Sea-Doo Islandia SE 215 1503 2009

Starter Gear for Sea-Doo

The Starter Gear is a replacement starting component that engages the flywheel to crank the engine over, and it is a direct-fit alternative for OEM number 420834488 used on Sea-Doo personal watercraft and sport boats.

Overview

This Starter Gear is built to serve as a replacement starter drive gear for Sea-Doo watercraft, delivering reliable engagement between the starter motor and the engine flywheel every time you turn the key. The starter gear for Sea-Doo is manufactured to match the original dimensions, tooth count, and mounting configuration so installation goes smoothly. It suits riders and mechanics handling routine replacement on aging or high-hour machines.

Built For Performance

• Machined gear teeth sized to match the OEM 420834488 profile for correct flywheel engagement
• Hardened steel construction for wear resistance under repeated starting cycles
• Manufactured to factory dimensions for a drop-in fit without modification
• Corrosion-resistant surface treatment suited to marine engine compartments
• Balanced and inspected for smooth rotation at starter motor speeds

Fits These Machines

• for Sea-Doo Islandia SE 215 with the 1503 engine
• for Sea-Doo models using the 1503 4-TEC engine platform
• for Sea-Doo personal watercraft and sport boats specifying OEM 420834488

On-The-Job Use

• Replacing a worn or stripped starter drive gear that slips or grinds on startup
• Routine maintenance on high-hour 1503 engine watercraft
• Rebuilding a starter system during off-season service
• Restoring dependable cold-start cranking after a no-crank complaint

Specs At A Glance

Good To Know

Q: How do I know if my starter gear needs replacing? A: Grinding, whining, or a starter that spins without cranking the engine usually points to worn gear teeth. Pull the starter and inspect the gear for rounded or chipped teeth before ordering.

Q: Does this replace the factory gear directly? A: It is made to the OEM 420834488 specification for a direct replacement fit. Confirm your engine platform and serial number range before installation.

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