Namura .040 Over Bore Piston Kit for Kawasaki KFX400 2003-2006 models 91mm

Namura .040 Over Bore Piston Kit for Kawasaki

This Namura .040 over bore piston kit is a direct replacement oversized piston for Kawasaki KFX400 models 2003-2006, offering a 91mm bore to restore engine compression and power.

Overview

This Namura piston kit provides a .040 over bore (91mm) piston designed specifically for Kawasaki KFX400 ATVs from 2003 to 2006. It restores lost compression and performance after cylinder wear, making it an essential repair component for high-mileage engines. The kit includes the piston, rings, wrist pin, and circlips for a complete top-end rebuild.

Built For Performance

• Precision-machined from high-strength aluminum alloy for durability
• .040 over bore size (91mm) to clean up worn cylinder walls
• Includes piston rings, wrist pin, and circlips for complete installation
• Designed for high-RPM operation without compromising reliability
• Strict quality control ensures consistent fit and performance

Fits These Machines

• for Kawasaki KFX400 2003
• for Kawasaki KFX400 2004
• for Kawasaki KFX400 2005
• for Kawasaki KFX400 2006

Specs At A Glance

Good To Know

Q: Will this piston kit work with my stock cylinder? A: This kit is designed for cylinders that have been bored to 91mm (.040 over), so your cylinder must be machined to accept this oversize piston. Confirm your cylinder's current bore before ordering.

Q: Does this kit include piston rings? A: Yes, the kit includes a complete set of piston rings, wrist pin, and circlips for a full top-end rebuild. No additional parts are needed.

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