1981 Kawasaki KX250 Specifications and Specs
Specifications and workshop reference information for the 1981 Kawasaki KX250, 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, air-cooled, piston port, 2-stroke |
| Displacement | 246 cc |
| Bore × Stroke | 70.0 mm × 64.0 mm |
| Compression Ratio | 6.9:1 |
| Maximum Power | 41 hp @ 7,500 rpm |
| Maximum Torque | 37 Nm @ 6,500 rpm |
| Carburetor | Mikuni VM38SS | Replacement Options |
| Lubrication | Premix |
| Fuel Mix Ratio | 20:1 | Premix Calculator |
| Ignition | CDI Magneto |
| Spark Plug | NGK B8ES |
| Spark Plug Gap | 0.6 - 0.7 mm |
Transmission
| Transmission Type | 5-speed constant mesh |
| Clutch | Wet multi-plate |
| Primary Reduction | 2.952 (62/21) |
| Final Reduction | 3.923 (51/13) |
| Overall Reduction | 10.63:1 |
Dimensions
| Overall Length | 2215 mm |
| Overall Width | 890 mm |
| Overall Height | 1215 mm |
| Wheelbase | 1495 mm |
| Ground Clearance | 305 mm |
| Fuel Tank Capacity | 10.5 L |
| Bearing Sizes |
Bearing Finder |
Chassis
| Frame Type | Double cradle steel frame |
| Caster Angle | 29.0° |
| Trail | 120 mm |
| Front Suspension | Long-travel telescopic forks | Fork Oil Levels |
| Rear Suspension | Uni-Trak monoshock |
| Front Suspension Travel | 280 mm |
| Rear Suspension Travel | 300 mm |
Brakes & Wheels
250cc Other Specs
Community
VMX Owners Forum
Discuss vintage motocross bikes, restorations, tuning and riding.
