Revitalize the classic two-stroke powerplant of your vintage Yamaha with the ProX Connecting Rod Kit (Part No. 03.2203). Manufactured in Japan from ultra-tough, double-forged alloy steels, this kit is engineered to meet or exceed strict OEM specifications, providing dependable durability for high-RPM vintage racing and restoration projects.
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 placed lubrication slots ensure optimal oil feed and cooling to the big-end bearing, keeping your rotating assembly reliable under hard acceleration.
Vehicle Fitment
| Make | Model | Year Range | Specific Years |
| Yamaha | YZ125 | 1980–1985 | 1980, 1981, 1982, 1983, 1984, 1985 |
Kit Contents:
- Forged Connecting Rod
- Crankpin
- Big-End Bearing
- Small-End (Wrist Pin) Bearing
- Thrust Washers (where applicable)
TSO Tip
When rebuilding your vintage YZ125 bottom end, always verify that your crankshaft total indicated runout (TIR) measures under 0.03mm on V-blocks before dropping it back into the cases. Generously pre-lubricate the lower rod bearing with clean two-stroke premix oil during assembly to protect the moving parts the split-second the engine fires.
Compatibility
Fetching compatibility details...
| Year | Make | Model |
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