420256606 Valve Seat Sleeve for Sea-Doo Challenger SE 310 1503 2008-2011

Valve Seat Sleeve for Sea-Doo

This Valve Seat Sleeve is a replacement engine component designed to fit into the cylinder head of select Sea-Doo Challenger models, restoring proper valve seating and compression. It cross-references OEM part number 420256606 for a direct fit. This valve seat sleeve is suited to owners and mechanics servicing the 1503 engine platform.

Overview

This valve seat sleeve serves as the machined insert pressed into the cylinder head to support the valve and maintain a proper seal during combustion. It is built to match the original 420256606 specification, making it a practical choice for head reconditioning or engine rebuilds on compatible 1503 machines. Anyone servicing a Sea-Doo valve seat sleeve will find this part suitable for restoring valve function and compression.

Built For Performance

• Cross-references OEM part number 420256606 for confident replacement
• Machined to seat valves correctly within the cylinder head
• Constructed from durable metal alloy to withstand combustion temperatures
• Supports proper compression and valve sealing
• Suited to 1503 engine rebuild and head service work

Fits These Machines

• for Sea-Doo Challenger SE 310 1503, 2008-2011

On-The-Job Use

• Cylinder head reconditioning on 1503 engines
• Engine rebuilds and top-end service
• Valve seat replacement during head machining
• Restoring compression on high-hour PWC engines

Specs At A Glance

Good To Know

Q: Does this valve seat sleeve require machining to fit? A: Valve seat sleeves are typically pressed and machined to match the cylinder head, so professional installation and seat cutting are recommended for correct valve sealing.

Q: How many valve seat sleeves should I order? A: Order the quantity that matches the number of seats you are replacing in your cylinder head, as each sleeve covers a single valve seat position.

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