Keep your small-bore Yamaha ripping around the track or trails with the ProX Connecting Rod Kit (Part No. 03.2105). Manufactured in Japan from ultra-tough, double-forged alloy steels, this kit is engineered to withstand the demanding high-RPM environment of high-strung two-stroke mini engines while meeting or exceeding strict OEM standards.
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 delivery and cooling to the big-end bearing, guaranteeing dependable durability under hard racing conditions.
Vehicle Fitment
| Make | Model | Year Range | Specific Years |
| Yamaha | YZ80 | 1993–2001 | 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
| Yamaha | YZ85 | 2002–2018 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
Kit Contents:
- Forged Connecting Rod
- Crankpin
- Big-End Bearing
- Small-End (Wrist Pin) Bearing
- Thrust Washers (where applicable)
TSO Tip
Small-bore 80cc and 85cc cranks spin at exceptionally high RPMs, making accurate truing critical. Always check your crankshaft total indicated runout (TIR) on V-blocks with a dial indicator—keep it strictly under 0.03mm before dropping the assembly back into the cases. Generously pre-lubricate the lower rod bearing with clean two-stroke premix oil during assembly to prevent any dry-start scuffing on initial fire-up.
Compatibility
Fetching compatibility details...
| Year | Make | Model |
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