420256606 Valve Seat Sleeve for Sea-Doo GTI STD 155 1503 2017

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve, part number 420256606, is a replacement engine component that presses into the cylinder head to hold the valve seat securely in place for Sea-Doo watercraft.

Overview

This valve seat sleeve is a precision engine component designed for Sea-Doo personal watercraft equipped with the 1503 engine. It provides a solid, correctly sized bore for the valve seat, helping maintain proper valve sealing and long-term cylinder head performance. This sleeve is intended for riders and mechanics servicing the GTI STD 155 platform who need a reliable replacement part matching part number 420256606.

Built For Performance

• Direct replacement for OEM part number 420256606
• Machined to fit the 1503 engine cylinder head bore
• Helps restore correct valve seat alignment and sealing
• Durable construction suited to marine engine heat cycles
• Sold individually for targeted repair or rebuild work

Fits These Machines

• for Sea-Doo GTI STD 155 with 1503 engine (2017)

On-The-Job Use

• Cylinder head repair during top-end engine service
• Valve seat replacement on 1503 engine rebuilds
• Restoring valve sealing on high-hours personal watercraft
• Marine engine shops performing precision head work

Specs At A Glance

Good To Know

Q: Is this an original Sea-Doo part? A: No, this is an aftermarket valve seat sleeve made to match part number 420256606, and it is not an original brand product.

Q: How many sleeves are included? A: This listing is for one valve seat sleeve, so order the quantity your engine service requires.

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