Namura .020 Over Bore Piston Kit for Kawasaki KX250 1992-2004 66.9mm NX-20025-2

Namura .020 Over Bore Piston Kit for Kawasaki

This Namura .020 over bore piston kit is a high-performance replacement for Kawasaki KX250 motorcycles, designed to restore compression and power with an oversized 66.9mm piston; it cross-references OEM part number NX-20025-2.

Overview

The Namura .020 over bore piston kit provides a direct-fit replacement for the Kawasaki KX250, delivering reliable performance and improved cylinder sealing. This 66.9mm piston kit is engineered for 1992-2004 models, making it an ideal choice for rebuilding or upgrading the top end of your KX250 engine.

Built For Performance

• Precision-machined from high-strength aluminum alloy for durability
• .020 over bore size allows cylinder reconditioning while maintaining close tolerances
• Includes piston rings, wrist pin, and pin clips for a complete top-end rebuild
• Designed to match stock compression ratio for consistent power delivery
• Heat-treated and skirt-coated for reduced friction and longer service life

Fits These Machines

• for Kawasaki KX250 (1992-2004)

On-The-Job Use

• Motocross and off-road racing where top-end rebuilds are routine
• Trail riding and enduro competitions requiring reliable engine performance
• Engine rebuild projects for restoring vintage Kawasaki KX250 models
• Performance-oriented maintenance to refresh worn cylinder bores

Specs At A Glance

Good To Know

Q: Is this piston kit compatible with a standard bore cylinder? A: No, this is a .020 over bore piston, so your cylinder must be bored to match the 66.9mm diameter. Always have a professional measure your cylinder before ordering.

Q: Does the kit include a wrist pin bearing? A: The kit includes the wrist pin and pin clips, but you may need to reuse your existing wrist pin bearing if it is in good condition.

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