420256606 Valve Seat Sleeve for Sea-Doo Challenger SP 310 1503 2010-2011

Valve Seat Sleeve for Sea-Doo Challenger SP 310 1503

This valve seat sleeve is a replacement engine component for the Sea-Doo Challenger SP 310 1503, referenced under OEM part number 420256606, designed to restore valve seating surfaces in the cylinder head.

Overview

The valve seat sleeve for Sea-Doo Challenger SP 310 1503 engines provides a durable seating surface for the valve within the cylinder head, helping maintain proper compression and combustion sealing. This valve seat sleeve is intended for rebuilders and owners performing top-end service on the 1503 engine platform. Reference OEM number 420256606 when verifying fitment for your Sea-Doo Challenger SP 310 application.

Built For Performance

• Direct replacement for OEM part number 420256606
• Machined to seat valves precisely in the 1503 cylinder head
• Restores valve sealing for consistent compression
• Suitable for top-end rebuild and valve service work
• Constructed for the demands of marine engine operation

Fits These Machines

• for Sea-Doo Challenger SP 310 1503, 2010-2011

On-The-Job Use

• Cylinder head rebuilds on the 1503 engine
• Valve job and seat replacement service
• Top-end repair after valve wear or damage
• Marine engine maintenance and restoration

Specs At A Glance

Good To Know

Q: How do I know if my valve seat sleeve needs replacing? A: Worn or damaged valve seats can cause compression loss, rough running, or valve leakage, so inspect the seating surface during any top-end teardown. Replace the sleeve when pitting, recession, or scoring is visible.

Q: Is this an OEM Sea-Doo part? A: This is a replacement valve seat sleeve cross-referenced to OEM number 420256606 for the Sea-Doo Challenger SP 310 1503. Always confirm the part number against your machine before ordering.

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