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

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve is a replacement engine component for Sea-Doo 1503 4-TEC powerplants, designed to restore proper valve seating and sealing in the cylinder head for reliable compression and combustion, and it is a direct reference to OEM part 420256606.

Overview

This valve seat sleeve for Sea-Doo is a precision-machined insert that presses into the cylinder head to give the valve a stable, correctly sized seat. The valve seat sleeve restores the sealing surface between valve and head so compression stays consistent and combustion stays efficient. It suits riders and mechanics rebuilding or refreshing a 2012 Challenger S with the twin 155 1503 engine package.

Built For Performance

• Precision-machined seat surface for consistent valve sealing
• Restores worn or damaged valve seat geometry in the cylinder head
• Built to handle the heat and stress of a 1503 engine
• Direct reference to OEM part number 420256606
• Intended for cylinder head rebuild and valve service work

Fits These Machines

• for Sea-Doo Challenger S with 2 x 155 1503 engine, 2012

On-The-Job Use

• Cylinder head rebuilds on 1503 4-TEC engines
• Valve jobs where the original seat is worn or damaged
• Top-end refresh after overheating or compression loss
• Shop and DIY service work on Challenger S models

Specs At A Glance

Good To Know

Q: Does this sleeve fit both intake and exhaust valves? A: Fitment depends on the specific valve position and head design, so confirm the location against your service manual before ordering. Q: Why replace a valve seat sleeve instead of the whole head? A: A new sleeve restores the sealing surface at a fraction of the cost of a complete head assembly when the casting itself is still sound.

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