Transmission And Internal Shift Mechanism Specifications For Your 1997-2001 Yamaha YZ125
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Transmission Gear Ratios
| Primary Reduction System | |
| – Type | Gear |
| – Reduction Ratio | 3.368 (64/19) |
| Secondary Reduction System | |
| – Type | Chain |
| – Reduction Ratio | 3.846 (50/13) |
| Transmission Type | 6-speed Constant Mech |
| Transmission Gear Ratios | |
| – First | 2.307 (30/13) |
| – Second | 1.866 (28/15) |
| – Third | 1.529 (26/17) |
| – Fourth | 1.286 (27/21) |
| – Fifth | 1.130 (26/23) |
| – Sixth | 1.00 (24/24) |
