799M06640 Wiseco Std Piston Kit for Kawasaki KX250 2002-2004 66.40 mm

Std Piston Kit for Kawasaki KX250

This Wiseco standard piston kit for Kawasaki KX250 restores top-end compression with a 66.40 mm piston, cross-referenced under part number 799M06640.

Overview

This Wiseco standard piston kit for Kawasaki KX250 gives riders a direct replacement top-end component for 2002 through 2004 models. The kit is built for riders doing routine rebuilds who need a dependable piston at standard bore without overboring. It pairs with stock cylinder dimensions for a straightforward refresh.

Built For Performance

• Standard 66.40 mm bore size matches stock cylinder dimensions
• Wiseco forged piston construction for high-rpm durability
• Kit format supplies piston and matching components for one top-end job
• Designed around the 799M06640 part number for easy reference
• Suited to two-stroke motocross engines that see frequent rebuild intervals
• Direct-fit sizing keeps machining steps out of the rebuild

Fits These Machines

• for Kawasaki KX250 2002
• for Kawasaki KX250 2003
• for Kawasaki KX250 2004

On-The-Job Use

• Top-end rebuilds after a piston wears past service limits
• Fresh compression for motocross race weekends
• Scheduled maintenance on trail and track bikes
• Restoring a used KX250 before resale

Specs At A Glance

Good To Know

Q: Is this piston kit a genuine Kawasaki part? A: No, this is a Wiseco piston kit made for Kawasaki KX250 applications, not an original factory component. It is designed to fit the listed models at standard bore.

Q: Will I need to measure cylinder wear before installing? A: Yes, checking cylinder diameter and taper before fitting a standard piston is standard practice on any two-stroke top-end rebuild. If the bore is out of tolerance, a re-plate or overbore may be required.

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