420256606 Valve Seat Sleeve for Sea-Doo Speedster 510 1503 2010-2011

Valve Seat Sleeve for Sea-Doo Speedster 510 1503

This valve seat sleeve is a replacement engine component for the Sea-Doo Speedster 510 1503, designed to restore proper valve seating in the cylinder head and keep compression where it belongs. It cross-references OEM part number 420256606.

Overview

This valve seat sleeve for Sea-Doo is a precision-fit replacement that presses into the cylinder head to give the valve a fresh, true sealing surface. It is made for riders and mechanics rebuilding a 1503 engine who want dependable valve sealing without replacing the entire head. The valve seat sleeve works as a direct-fit solution for worn or damaged seats in the Sea-Doo Speedster 510.

Built For Performance

• Precision-machined seating surface for proper valve-to-seat contact
• Restores compression lost to worn or pitted valve seats
• Constructed from durable material rated for high combustion temperatures
• Direct replacement for OEM part number 420256606
• Designed for the 1503 engine platform used in the Speedster 510

Fits These Machines

• for Sea-Doo Speedster 510 1503 (2010-2011)

On-The-Job Use

• Cylinder head rebuilds on the 1503 engine
• Valve job service when seats are worn, pitted, or recessed
• Restoring lost compression on a high-hour Speedster 510
• Top-end refresh during routine engine maintenance

Specs At A Glance

Good To Know

Q: Does this valve seat sleeve come as a single piece? A: Yes, this listing is for one valve seat sleeve matching OEM part number 420256606. Order the quantity you need for your specific cylinder head service.

Q: Can I install this without machining the head? A: Valve seat sleeves are typically pressed in and finished by a machine shop to match valve angles and seat depth. Confirm the required installation procedure with your service manual before starting the job.

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