| Number | Name | Brand | Fit |
|---|
| S4-SG84DA | DP48 84T Spur Gear | Yokomo | direct iYokomo's store lists it for YZ-4SF |
| Z2-SG72DA | DP48 72T Dual Pad Spur Gear for YZ-2 discontinued | Yokomo | direct iYokomo's store lists it for YZ-4SF |
| Z4-SG87 | DP48 87T Spur Gear for YZ-4 discontinued | Yokomo | direct iYokomo's store lists it for YZ-4 |