420256606 Valve Seat Sleeve for Sea-Doo Challenger SE 2 x 155 1503 2012

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve is a replacement engine component for Sea-Doo 1503 engines, built to OEM reference 420256606 and sized to press into the cylinder head to give the valve a stable, correctly positioned seat.

Overview

The valve seat sleeve for Sea-Doo 1503 engines restores the seating surface that keeps valves aligned and sealing properly in the head. It is a direct-fit replacement for the original sleeve, referenced as 420256606, and suits rebuilds of 155 horsepower 1503 powerplants. Choose this valve seat sleeve for Sea-Doo watercraft engine work when the head is apart and worn seats need replacing.

Built For Performance

• Machined to OEM reference 420256606 for correct press-fit dimensions
• Heat-resistant alloy construction suited to continuous cylinder head temperatures
• Precision inner bore supports proper valve sealing and alignment
• Designed for 1503 engine cylinder heads in 155 horsepower marine applications
• Sold individually so you can order the exact quantity your rebuild needs
• Stable seat surface helps maintain consistent compression

Fits These Machines

• for Sea-Doo Challenger 2 x 155 models with the 1503 engine
• for Sea-Doo Challenger SE 2 x 155 models with the 1503 engine
• for Sea-Doo 1503 155 horsepower engines from the 2012 model year

On-The-Job Use

• Cylinder head rebuilds and valve jobs on 1503 marine engines
• Repair work after valve seat wear, recession, or damage is found
• Shop and DIY engine service on Sea-Doo Challenger and Challenger SE craft
• Top-end refreshes where the head is removed for inspection

Specs At A Glance

Good To Know

Q: How many valve seat sleeves does one engine need? A: The 1503 cylinder head uses multiple seats, so order the number of sleeves your specific head requires. Count the worn or damaged positions before placing your order.

Q: Does this sleeve need machining after installation? A: Seat sleeves are typically installed with a press and then cut or lapped so the valve seals correctly. Have the head measured and finished by a machine shop for the best results.

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