Transmission
The YZ125 has been built with five- or six-speed sequential gearboxes depending on model year. The 2005 model has a Constant mesh wet, multiple-disc coil spring clutch. The revised gear ratios as of the 2005 model are:
- Gear Ratio - 1st Gear 31/13 (2.385)
- Gear Ratio - 2nd Gear 29/15 (1.933)
- Gear Ratio - 3rd Gear 27/17 (1.588)
- Gear Ratio - 4th Gear 23/17 (1.353)
- Gear Ratio - 5th Gear 24/20 (1.200)
- Gear Ratio - 6th Gear 23/21 (1.095)
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