Revitalize the high-winding powerplant of your late-model 125 with the ProX Connecting Rod Kit (Part No. 03.4223). Manufactured in Japan from ultra-tough, double-forged alloy steels, this kit is engineered to meet or exceed strict OEM specifications, providing the ultimate foundation for hard-riding small-bore builds.
Each rod is shot-peened and barrel-finished to completely eliminate surface micro-imperfections, relieve residual stress, and optimize structural grain flow for maximum fatigue resistance. Strategically positioned lubrication slots maximize oil feed to the big-end bearing, ensuring long-lasting durability and cooling under wide-open throttle.
Vehicle Fitment
| Make | Model | Year Range | Specific Years |
| Kawasaki | KX125 | 2003–2007 | 2003, 2004, 2005, 2006, 2007 |
Kit Contents:
- Forged Connecting Rod
- Crankpin
- Big-End Bearing
- Small-End (Wrist Pin) Bearing
- Thrust Washers (where applicable)
TSO Tip
When buttoning up your KX125 bottom end, always check your crankshaft total indicated runout (TIR) on V-blocks with a dial indicator—aim to keep it well under 0.03mm to eliminate high-RPM vibration. Pre-lubricate the lower rod bearing liberally with clean two-stroke premix oil during assembly to protect your new parts on initial startup.
Compatibility
Fetching compatibility details...
| Year | Make | Model |
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