Top-End Specifications For Your 1997-2001 Yamaha YZ125
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Crankshaft Service Specifications
| New – mm (in.) | Service Limit – mm (in.) | |
| Crankshaft Web Width | 55.90 – 55.95 (2.201 – 2.203) | – |
| Crankshaft Runout Limit | 0.03 (0 – 0.0012) | 0.05 (0.0020) |
| Connecting Rod-to-Crankshaft Side Clearance | 0.20 – 0.70 (0.008 – 0.026) | – |
| Small End Side-to-Side Free Play | ||
| – 1994 – 1995 | 0.4 – 1.0 (0.016 – 0.039) | 2.0 (0.08) |
| – 1996 – 2001 | 0.8 – 1.0 (0.031 – 0.039) | 2.0 (0.08) |
Bottom End Torque Specifications
| ft.-lb | in.-lb. | N•n | |
| Crankcase Bearing Retaining Screws | – | 88 | 10 |
| Crankcase Mounting Bolts | – | 124 | 14 |
| Cylinder head Hanger Nuts | 25 | – | 34 |
| Engine Mounting Nuts | |||
| – Upper Bracket | 25 | – | 34 |
| – Pivot Shaft | 63 | – | 85 |
| – Upper Mount | 32 | – | 43 |
| – Lower Mount | 51 | – | 69 |
| – Front Mount | 25 | – | 34 |
| Primary Drive Gear Bolt | 41 | – | 55 |
| Flywheel Nut | 27 | – | 38 |
| Shift Drum Cam Mounting Bolt | 22 | – | 30 |
| Swing Arm Pivot Shaft Nut | 63 | – | 85 |
| Transmission Oil Drain Bolt | 15 | – | 20 |
