1976 Yamaha YZ125 Specifications and Specs
Specifications and workshop reference information for the 1976 Yamaha YZ125, including engine, chassis, service data and setup details.
Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.
General Specifications
| Engine Type | Single-cylinder, two-stroke, air-cooled |
| Displacement | 123 cc |
| Bore × Stroke | 54.0 × 54.0 mm |
| Compression Ratio | 6.8:1 |
| Maximum Power | ~22 hp |
| Maximum Torque | |
| Carburetor | Mikuni VM32 | Replacement Options |
| Lubrication | Premix |
| Fuel Mix Ratio | 25:1 | Premix Calculator |
| Ignition | Magneto |
| Spark Plug | NGK B8ES |
| Spark Plug Gap | 0.5 – 0.6 mm |
Transmission
| Transmission Type | 5-speed constant mesh |
| Clutch | Wet multi-plate |
| Primary Reduction | 3.409 |
| Final Reduction | 3.000 |
Dimensions
| Overall Length | 2,110 mm |
| Overall Width | 820 mm |
| Overall Height | 1,200 mm |
| Wheelbase | 1,410 mm |
| Ground Clearance | 270 mm |
| Fuel Tank Capacity | 8.0 L |
| Bearing Sizes |
Bearing Finder |
Chassis
| Frame Type | Steel single cradle |
| Front Suspension | Telescopic forks | Fork Oil Levels |
| Rear Suspension | Twin shock |
| Front Suspension Travel | |
| Rear Suspension Travel | |
Brakes & Wheels
125cc Other Specs
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