40020M07700 Wiseco Std Piston Kit for Kawasaki KX250F 2011-2014 76.96mm 14.5:1

Wiseco Std Piston Kit for Kawasaki KX250F

This 76.96mm standard bore piston kit for Kawasaki references OEM part 40020M07700 and delivers the 14.5:1 compression ratio used in the KX250F motocross engine.

Overview

This Wiseco Std Piston Kit for Kawasaki is a high-compression replacement piston for the KX250F four-stroke motocross engine. The 76.96mm bore and 14.5:1 compression ratio restore the punch these bikes are known for during a top-end rebuild. It suits racers and weekend riders servicing 2011-2014 KX250F machines with stock bore cylinders.

Built For Performance

• 76.96mm standard bore matches the factory cylinder without machining
• 14.5:1 compression ratio for strong low-end and mid-range response
• Forged aluminum piston body for durability in high-revving motocross use
• Complete kit with rings, wrist pin, and circlips for a full top-end job
• Precision machined ring lands for stable ring seal and compression

Fits These Machines

• for Kawasaki KX250F 2011
• for Kawasaki KX250F 2012
• for Kawasaki KX250F 2013
• for Kawasaki KX250F 2014

On-The-Job Use

• Scheduled top-end rebuilds on race and practice bikes
• Refreshing compression after a season of hard motocross use
• Rebuilding a used KX250F engine before resale or resumption of riding
• Combining with valve and cam service during a full head rebuild

Specs At A Glance

Good To Know

Q: Will this piston work with pump fuel at 14.5:1 compression? A: High-compression pistons typically call for higher-octane race fuel, so check your engine builder or manual recommendation before running pump gas. Running the wrong fuel can cause detonation and engine damage.

Q: Is this an original Kawasaki piston? A: This is an aftermarket Wiseco kit that cross-references OEM part 40020M07700 for fitment. It is not a genuine Kawasaki part.

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