Namura .040 Over Bore Piston Rings for Yamaha Some 2016-2018 700 104mm NO OEM

Namura .040 Over Bore Piston Rings for Yamaha

These Namura .040 oversize piston rings are designed for Yamaha 700cc engines with a 104mm bore, providing a precise seal in overbored cylinders to restore compression and power. This aftermarket set does not carry an OEM part number.

Overview

The Namura .040 over bore piston rings for Yamaha deliver a reliable sealing solution for 700cc engines that have been bored oversize, helping to rebuild top‑end performance. These rings suit Yamaha models from 2016‑2018 that use a 104mm piston, making them a solid choice for engine rebuilders.

Built For Performance

• Manufactured from high‑strength ductile iron for durability
• Precisely machined to .040 oversize for a tight fit in bored cylinders
• Designed to handle high RPM loads without ring flutter
• Compatible with OEM ring grooves after proper piston selection

On‑The‑Job Use

• Engine top‑end rebuilds and performance restoration
• Motocross, trail riding, and utility applications with bored cylinders
• Replacing worn rings to reduce oil consumption and improve compression

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing new rings? A: Yes, a proper cylinder hone with the correct crosshatch pattern is essential for ring seating and long life.

Q: Can these rings be used with a stock piston? A: No, .040 oversize rings require a matching oversize piston; they are not compatible with standard pistons.

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