1985 Kawasaki KX125
Specifications and workshop reference information for the 1985 Kawasaki KX125, 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 | 124cc liquid-cooled 2-stroke single |
| Displacement | 124cc |
| Bore × Stroke | 54.0 × 54.0 mm |
| Compression Ratio | 7.6:1 |
| Maximum Power | 32 hp @ 10,500 rpm |
| Maximum Torque | 21 Nm @ 9,000 rpm |
| Carburetor | Mikuni VM34SS |
| Lubrication | Premix |
| Fuel Mix Ratio | 32:1 |
| Ignition | CDI |
| Spark Plug | NGK BR9EV |
| Spark Plug Gap | 0.6 – 0.7 mm |
Transmission
| Transmission Type | 6-speed manual |
| Clutch | Wet multi-plate |
| Primary Reduction | 3.409 (75/22) |
| Final Reduction | 3.846 (50/13) |
| Overall Reduction | 11.01 |
Dimensions
| Overall Length | 2,165 mm |
| Overall Width | 825 mm |
| Overall Height | 1,235 mm |
| Wheelbase | 1,465 mm |
| Ground Clearance | 340 mm |
| Fuel Tank Capacity | 8.5 L |
Chassis
| Frame Type | High-tensile steel perimeter frame |
| Caster Angle | 28° |
| Trail | 118 mm |
| Front Suspension | Kayaba leading-axle forks |
| Rear Suspension | Uni-Trak monoshock |
| Front Suspension Travel | 305 mm |
| Rear Suspension Travel | 315 mm |
Brakes & Wheels
| Front Tire | 80/100-21 |
| Rear Tire | 100/90-18 |
| Front Brake | Single disc |
| Rear Brake | Drum |
125cc Other Specs
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