844M06640 Wiseco Std Single Ring Piston Kit for Kawasaki KX250 2005-2008 66.40mm

Wiseco Std Single Ring Piston Kit for Kawasaki KX250

This Wiseco standard single ring piston kit for Kawasaki KX250 provides a 66.40 mm bore replacement top end, cross referenced to 844M06640.

Overview

This Wiseco standard single ring piston kit for Kawasaki KX250 is built for riders who need a reliable top end refresh on their two stroke engine. The 66.40 mm standard bore and single ring design reduce friction while maintaining strong compression for race use. It is intended for motocross and off road riders maintaining a KX250 in stock displacement.

Built For Performance

• 66.40 mm standard bore sizing matches the stock cylinder for a direct fit
• Single ring design reduces friction for quicker rev response
• Wiseco forged piston construction for durability under high heat and load
• Kit includes piston, ring, wrist pin, and circlips for a complete top end job
• Precision machined for consistent ring seal and compression
• Cross referenced to part number 844M06640 for easy verification

Fits These Machines

• for Kawasaki KX250 2005
• for Kawasaki KX250 2006
• for Kawasaki KX250 2007
• for Kawasaki KX250 2008

On-The-Job Use

• Two stroke top end rebuilds at regular service intervals
• Motocross racing where quick throttle response matters
• Trail and off road riding with stock displacement engines
• Restoring compression on high hour KX250 engines

Specs At A Glance

Good To Know

Q: How often should a single ring piston be replaced? A: Single ring pistons are typically serviced more frequently than multi ring designs, often based on hours of use. Check ring end gap and piston skirt wear at each interval.

Q: Does this kit require cylinder work before installation? A: This is a standard bore piston, so it suits a cylinder still within factory specification. Measure the bore and check plating condition before assembly.

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