Pro-X
ProX Racing Parts Connecting Rod Kit (03.2309)
ProX Racing Parts Connecting Rod Kit (03.2309)
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The Pro-X 03.2309 Connecting Rod Kit is specifically designed for Yamaha's 250cc two-stroke motocross and cross-country models. It fits the Yamaha YZ250 from 1999 to 2026 and the Yamaha YZ250X from 2016 to 2026.
Comprehensive Fitment List
The kit is a direct OEM replacement for the following models and years:
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Yamaha YZ250: 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.
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Includes special editions: 50th Anniversary Edition (2024) and Monster Energy Yamaha Racing Edition (2023–2025).
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Yamaha YZ250X: 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026.
Technical Specifications
If you are verifying compatibility with a custom crankshaft or specialized build, here are the dimensions for the Pro-X 03.2309:
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Center-to-Center Length: 125.00 mm
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Big End Bore Diameter: 31.00 mm
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Big End Width: 17.00 mm
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Small End Bore Diameter: 22.00 mm
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Small End Width: 20.00 mm
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Big End Pin Dimensions: 24 mm x 58.70 mm
Included in the Kit
This is a complete rebuild kit that typically includes:
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Double-forged connecting rod
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Big-end (crankpin) bearing
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Small-end (wrist pin) bearing
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Crankpin
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Thrust washers
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