| Production |
 |
|
|
| Begin of the Production |
|
1925 |
|
| End of the Production |
|
1927 |
|
| Numbers Produced |
|
855 |
|
| Price |
|
1.870,- RM |
|
 |
| Engine |
|
|
|
| Internal Designation |
|
M 40 |
|
| Motor Type |
|
four-stroke single-cylindervertical |
|
| Bore x Stroke |
|
68 x 68 mm |
|
| Displacement |
|
247 ccm |
|
| Max Power |
|
6,5 hp at 4500 rpm |
|
| Compression Ratio |
|
6.0 : 1 |
|
| Valves |
|
ohv |
|
| Carburetion System |
|
1 x carburettor BMW Spezial 20 mm |
|
| Engine Lubricating System |
|
forced-feed lubrication |
|
| Oil Pump |
|
gear pump |
|
|
| Power transmission |
|
|
|
| Clutch |
|
single-plate, dry |
|
| Number of Gears |
|
3 |
|
| Shifting |
|
manual |
|
| Gearbox Ratios |
|
6 / 9.28 / 13.7 |
|
| Rear Wheel Ratio |
|
1 : 2.84 |
|
| Bevel / Crownwheel |
|
14 / 37 teeth |
|
|
| Electrical system |
|
|
|
| Ignition System |
|
Bosch magneto generator type G 1.8 V/15 W |
|
| Generator |
|
Bosch magneto ignition |
|
| Spark Plugs |
|
Bosch W 175 |
|
|
|
|
| Chassis |
|
|
|
| Designation |
|
R 39 |
|
| Frame |
|
twin-loop tubular frame |
|
| Front Wheel Suspension |
|
plate spring, 4 laminae |
|
| Rear Wheel Suspension |
|
rigid |
|
| Wheel Rims |
|
27 x 3.5 type CC I |
|
| Tyres front |
|
27 x 3.5 balloon or with 26 x 3 high-pressure tyres |
|
| Tyres rear |
|
27 x 3.5 balloon or with 26 x 3 high-pressure tyres |
|
| Brakes front |
|
internal shoe brake (drum brake) Ø 150 mm |
|
| Brakes rear |
|
external shoe brake at the gearing (on cardan shaft) |
|
|
| Dimensions / Weights |
|
|
|
| Length x Width x Height |
|
2050 x 800 x 950 mm |
|
| Fuel Tank Capacity |
|
10 l |
|
| Unladen Weight, Full Tank |
|
110 kg |
|
| Fuel Consumption |
|
approx. 2,5 l/100 km |
|
| Oil Consumption |
|
approx. 1-2 l/1000 km |
|
| Top Speed |
|
100 kph |
|
|
|
