420256606 Valve Seat Sleeve for Sea-Doo Sport 18-300 1630 2026

Valve Seat Sleeve for Sea-Doo

This valve seat sleeve, reference 420256606, is a cylinder head component that holds the valve seat securely in place on 1630 engine platforms.

Overview

This valve seat sleeve fits Sea-Doo Sport 18-300 1630 machines and serves as a durable insert that supports valve seating within the cylinder head. The valve seat sleeve, part 420256606, helps maintain proper valve alignment and compression for reliable engine operation. It is intended for riders and mechanics performing top-end service on their 1630-equipped watercraft.

Built For Performance

• Precision-formed insert for 1630 engine cylinder heads
• Supports consistent valve seating and alignment
• Constructed from heat-resistant material for marine use
• Direct replacement for reference 420256606
• Helps maintain compression and engine efficiency

Fits These Machines

• for Sea-Doo Sport 18-300 1630 (2026)

On-The-Job Use

• Cylinder head rebuilds and top-end service
• Valve seat replacement during engine repair
• Routine maintenance on 1630 marine engines
• Restoring proper valve seal in performance watercraft

Specs At A Glance

Good To Know

Q: Is this an original Sea-Doo part? A: This is an aftermarket valve seat sleeve made for Sea-Doo 1630 engines, not an original brand component. Always verify the part number 420256606 matches your machine before ordering.

Q: How many sleeves should I order? A: Valve seat sleeves are typically replaced per valve position, so confirm the count needed for your specific cylinder head service. Check your service manual or consult a mechanic for the correct quantity.

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