420256606 Valve Seat Sleeve for Sea-Doo GTX STD 155 1503 2017-2018

Valve Seat Sleeve for Sea-Doo GTX STD 155

This valve seat sleeve is a replacement engine component designed to restore proper valve sealing and compression on the 1503 engine, carrying OEM cross-reference 420256606.

Overview

This valve seat sleeve for Sea-Doo GTX STD 155 is a precision engine component that presses into the cylinder head to give the valve a durable, correctly sized seating surface. It helps maintain proper valve seal and compression on the 1503 engine. This valve seat sleeve is intended for riders and mechanics rebuilding or repairing 2017 to 2018 GTX STD 155 models.

Built For Performance

• Precision-machined seating surface for consistent valve seal
• Constructed to withstand repeated combustion heat cycles
• Direct replacement for OEM reference 420256606
• Restores cylinder head geometry during a rebuild
• Compatible with the 1503 engine platform

Fits These Machines

• for Sea-Doo GTX STD 155 1503, 2017-2018

On-The-Job Use

• Cylinder head rebuilds and top-end refreshes
• Valve seal repair on the 1503 engine
• Compression restoration after valve seat wear
• Routine engine maintenance for personal watercraft

Specs At A Glance

Good To Know

Q: Does this valve seat sleeve fit both cylinders? A: Fitment depends on your specific cylinder head and serial number, so verify the OEM reference 420256606 matches your application before ordering. A: Installation typically requires a machine shop to press and size the sleeve correctly.

Q: Is this an original Sea-Doo part? A: This is a replacement valve seat sleeve cross-referenced to OEM number 420256606 and is not an original brand product. Confirm your engine code and model year before purchase.

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