1980 Yamaha YZ80
Specifications and workshop reference information for the 1980 Yamaha YZ80, 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 | Air-cooled, 2-stroke, single-cylinder |
| Displacement | 79 cc |
| Bore × Stroke | 47.0 × 45.0 mm |
| Compression Ratio | 6.8:1 |
| Maximum Power | Approx. 12 hp |
| Maximum Torque | |
| Carburetor | Mikuni |
| Lubrication | Premix |
| Fuel Mix Ratio | 20:1 |
| Ignition | CDI |
| Spark Plug | NGK B8ES |
| Spark Plug Gap | 0.6–0.7 mm |
Transmission
| Transmission Type | 5-speed manual |
| Clutch | Wet multi-plate |
| Primary Reduction | |
| Final Reduction | Chain drive |
| Overall Reduction | |
Dimensions
| Overall Length | 1,800 mm |
| Overall Width | 740 mm |
| Overall Height | 1,050 mm |
| Wheelbase | 1,230 mm |
| Ground Clearance | 260 mm |
| Fuel Tank Capacity | 5.0 L |
Chassis
| Frame Type | Steel single cradle |
| Caster Angle | |
| Trail | |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shock swingarm |
| Front Suspension Travel | |
| Rear Suspension Travel | |
Brakes & Wheels
| Front Tire | 2.50-21 |
| Rear Tire | 3.00-18 |
| Front Brake | Drum brake |
| Rear Brake | Drum brake |
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