03.4223 Pro-X Connecting Rod Kit for Kawasaki KX125 2003-2008 KX 125

Connecting Rod Kit for Kawasaki KX125

This Pro-X connecting rod kit is a complete crankshaft rebuild component for the Kawasaki KX125, cross-referencing part number 03.4223, and it replaces a worn rod to keep the piston properly connected to the crank throughout the rev range.

Overview

This connecting rod kit is built to refresh the bottom end of a Kawasaki KX125 from the 2003 to 2008 model run, replacing a worn or stretched rod with a fresh assembly for the 03.4223 application. It gives racers and rebuilders the core parts needed to bring a tired motocross crank back into service. This connecting rod kit suits anyone doing a top-to-bottom engine rebuild on a Kawasaki KX125.

Built For Performance

• Complete kit with rod, bearings, and thrust washers for a full lower-end refresh
• Manufactured to match the 03.4223 specification for the Kawasaki KX125
• Heat-treated steel construction for strength under motocross loads
• Precision-ground big-end and small-end bores for proper bearing fit
• Balanced design to help reduce vibration at high rpm

Fits These Machines

• for Kawasaki KX125 2003
• for Kawasaki KX125 2004
• for Kawasaki KX125 2005
• for Kawasaki KX125 2006
• for Kawasaki KX125 2007
• for Kawasaki KX125 2008

On-The-Job Use

• Bottom-end rebuilds on motocross two-stroke engines
• Track and practice riding where engine reliability matters
• Workshop repairs where the crank is split for inspection
• Restoring older Kawasaki KX125 machines to running condition

Specs At A Glance

Good To Know

Q: What is included in this connecting rod kit? A: It includes the connecting rod along with the bearings and thrust washers needed for a typical lower-end rebuild. Confirm the exact contents against your service manual before assembly.

Q: Do I need special tools to install it? A: Installing a connecting rod kit requires a press and crank truing tools along with mechanical experience. Professional installation is recommended to get the crank within tolerance.

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