Namura Piston Rings fits Kawasaki 1986-1991 JS 300, SX 300 .020 Over Bore 76.5mm

Piston Rings for for Namura

These piston rings for for Namura provide a precise seal for Kawasaki JS 300 and SX 300 jet ski engines with a 76.5mm .020 over bore. The Namura piston rings maintain necessary cylinder pressure and reduce oil consumption for high-performance watercraft. These Namura piston rings are essential for achieving a proper seal during a cylinder re-bore or engine rebuild.

Overview

These oversized rings are built for professional-grade engine rebuilds on vintage personal watercraft. They provide excellent tension and sealing properties to restore lost horsepower to the 300cc engine. These Namura piston rings meet or exceed factory requirements for durability and fit.

Built For Performance

• Designed for .020 over bore engines at 76.5mm diameter.
• Features heat-resistant alloy for marine engine environments.
• Precision-ground for quick seating against the cylinder wall.
• Provides superior blow-by control to maximize torque.

Fits These Machines

• for Kawasaki JS 300 1986-1991
• for Kawasaki SX 300 1986-1991

On-The-Job Use

• Restoring compression after boring the cylinder oversized.
• Completing top-end rebuilds on classic Kawasaki jet skis.
• Ensuring reliable power output for competitive or recreational use.

Specs At A Glance

Good To Know

Q: Are these rings pre-gapped? A: Always verify the ring end gap in the cylinder before final installation as specifications may vary. Q: Can these be used on standard bore cylinders? A: No, these are specifically designed for a .020 over bore and will not seal correctly on standard cylinders.

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