| Attribute | Value |
| General |
| Production from | 1938 year |
| Make | BMW |
| Model | BMW R51 |
| Category | Allround |
| Engine and transmission |
| Engine type | Two cylinder boxer, four-stroke |
| Valves per cylinder | Add |
| Fuel system | Carburettor. Amal |
| Engine details | Add |
| Displacement | 494 cm³ |
| Power | 17.6 kw |
| Max RPM | Add |
| Fuel consumption | 4 l/100km |
| Cooling system | Air |
| Transmission type,final drive | Shaft drive (cardan) |
| Torque | Add |
| Bore | 68 mm |
| Stroke | 68 mm |
| Gearbox | 4-speed |
| Greenhouse gases | 92.8 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Fuel control | Overhead Valves (OHV) |
| Emission details | Add |
| Driveline | Add |
| Ignition | Battery |
| Clutch | Dry-single plate-cable operated |
| Lubrication system | Wet sump |
| Compression | 6.7:1 |
| Exhaust system | Add |
| Chassis |
| Front suspension | Cartridge |
| Rear suspension | Twin shock-Swingarm |
| Front brakes | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) |
| Diameter | 200 mm |
| Frame type | Steel single cradle |
| Front tyre | 3.50-19.00 |
| Rear tyre | 3.50-19.00 |
| Seat | Single seat |
| Wheels | Add |
| Front wheel travel | Add |
| Rear wheel travel | Add |
| Trail | Add |
| Rake (fork angle) | Add |
| Other |
| Battery capacity | Add |
| Starter | Kick |
| Color options | Add |
| Carrying capacity | 210kg |
| Light | Add |
| Instruments | Add |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | 1,400 mm |
| Kerb weight | 182 kg |
| Dry weight | Add |
| Power/weight ratio | Add |
| Overall height | 960 mm |
| Overall length | 2,130 mm |
| Overall width | 815 mm |
| Seat height | Add |
| Alternate seat height | Add |
| Ground clearance | Add |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | 140 km/h |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 14 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |