Fortify the legendary two-stroke powerplant of your Yamaha with the ProX Connecting Rod Kit (Part No. 03.2309). 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 racing and trail riding.
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 | YZ250 | 1999–2026 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Yamaha | YZ250X | 2016–2026 | 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
Kit Contents:
- Forged Connecting Rod
- Crankpin
- Big-End Bearing
- Small-End (Wrist Pin) Bearing
- Thrust Washers (where applicable)
TSO Tip
When rebuilding your YZ250 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...
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