420256606 Valve Seat Sleeve for Sea-Doo GTI 1503 2015

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve, reference 420256606, is a replacement engine component that seats the valve and helps maintain proper compression in Sea-Doo 1503 engines.

Overview

This valve seat sleeve for Sea-Doo is a cylinder head component that presses into the head to give the valve a durable, accurately sized seat. The 420256606 valve seat sleeve helps restore valve sealing and combustion efficiency in a rebuild or top-end refresh. It suits riders and mechanics working on four-stroke Sea-Doo personal watercraft engines.

Built For Performance

• Precision machined for a consistent valve seat angle
• Hardened surface to resist wear from repeated valve cycling
• Direct replacement profile for the 420256606 reference
• Withstands the heat of four-stroke combustion cycles
• Press-fit design matches the cylinder head bore

On-The-Job Use

• Top-end engine rebuilds on four-stroke Sea-Doo watercraft
• Valve sealing restoration when compression drops
• Cylinder head servicing during seasonal maintenance
• Shop repair work on 1503 engine assemblies

Specs At A Glance

Good To Know

Q: How many valve seat sleeves come with one order? A: Each order covers the quantity you select, so check your cylinder head requirements before buying. Confirm the count against the number of seats you plan to replace.

Q: Does installing a valve seat sleeve require machine work? A: These sleeves are typically pressed into a prepared cylinder head bore, which usually calls for a machine shop. Have the head checked for bore size and valve seat concentricity 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.