420256606 Valve Seat Sleeve for Sea-Doo GTX LTD HO 1503 2019

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve, part number 420256606, presses into the cylinder head to hold the valve seat securely on the 1503 engine.

Overview

This valve seat sleeve is a cylinder head component for the Sea-Doo 1503 engine, identified by part number 420256606. The valve seat sleeve supports and locates the valve seat within the head, keeping valve alignment true through heat cycling and high-rpm running. It is intended for riders and mechanics servicing the HO 1503 platform.

Built For Performance

• Direct replacement for OEM part number 420256606
• Machined to seat concentrically in the cylinder head bore
• Withstands the heat and load of a 1503 four-stroke engine
• Keeps valve seat alignment stable under sustained rpm
• Sold as a single sleeve for one valve location

Fits These Machines

• for Sea-Doo GTX LTD HO (2019)

On-The-Job Use

• Cylinder head rebuilds and top-end service
• Valve seat replacement after wear or overheating
• Refresh work on a high-hour 1503 engine
• Machine shop head reconditioning jobs

Specs At A Glance

Good To Know

Q: Is this an original Sea-Doo part? A: This is a replacement valve seat sleeve for Sea-Doo watercraft, not an original factory part. It is made to match the dimensions of part number 420256606.

Q: Should the head be machined before fitting this sleeve? A: The seat bore should be checked and machined as needed so the sleeve fits with the correct interference. A machine shop can confirm the bore size 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.