2 Namura .020 Over Bore Piston Ring Kits for Sea-Doo 580 PWC 1990-1996 76.5mm

Piston Ring Kits for Sea-Doo

These two .020 oversize piston ring kits are designed for Sea-Doo 580 PWC engines from 1990 to 1996, with a bore size of 76.5mm, providing replacement rings for top end rebuilds.

Overview

This set of two Namura piston ring kits is intended for Sea-Doo 580 personal watercraft engines built between 1990 and 1996, using a 76.5mm bore and .020 overbore size. Each kit contains the rings needed for one piston, allowing you to restore compression and performance during engine rebuilding.

Built For Performance

• Manufactured from high-strength ductile iron for wear resistance
• Precision-ground to .020 overbore specification for accurate fit
• Each kit includes all rings required for a single piston
• Designed to provide optimal cylinder sealing and oil control

Fits These Machines

• for Sea-Doo 580 PWC 1990-1996

On-The-Job Use

• During top end rebuilds on Sea-Doo 580 personal watercraft
• When replacing worn piston rings to improve compression and reduce blow-by
• As part of an engine overhaul after boring the cylinder to .020 over size

Specs At A Glance

Good To Know

Q: Are these ring kits compatible with standard bore cylinders? A: These are .020 oversize rings, so they require the cylinder to be bored to 76.5mm; they will not fit a standard bore.

Q: Do the kits include the oil ring expander? A: Yes, each kit includes all rings—compression rings and oil ring assembly including expander.

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