|
Start of Production |
1927 |
Click to View |
|
End
of Production |
1928 |
|
Numbers Produced |
1,720 |
|
Price |
1,850 RM |
|
Engine |
|
|
Internal Designation |
M
51 |
|
Motor Type |
Four-stroke two cylinder flat twin |
|
Bore x Stroke |
68
x 68 mm (2.67 x 2.67 in) |
|
Displacement |
494
cc |
|
Max
Power |
18
hp at 4,000 rpm |
|
Compression Ratio |
5.8 : 1 |
|
Valves |
OHV |
|
Carburation System |
1
carburettor, Type BMW Spezial 2 valve 22 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 |
2.50 / 1.50 / 1.07 |
|
Rear Wheel Ratio |
1 : 4.38 (1 : 5.7 with sidecar) |
|
Bevel/Crownwheel |
13 / 57 teeth (10 / 57 with sidecar) |
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|
|
Electrical System |
|
|
Ignition System |
Bosch magneto ignition |
|
Generator |
Magneto generator on request |
|
Spark Plugs |
Bosch W 175 |
|
|
|
|
Chassis |
|
|
Designation |
R47 |
|
Frame |
Twin loop steel tubular frame |
|
Front wheel suspension |
Plate spring, 5 laminae |
|
Rear wheel suspension |
Rigid |
|
Wheel rims |
CC
1 |
|
Tyres, Front |
27 x 3.5 low pressure or 26 x 3 high pressure |
|
Tyres, Rear |
27 x 3.5 low pressure or 26 x 3 high pressure |
|
Brakes, Front |
Drum brake 150 mm
/ 5.90 in diameter |
|
Brakes, Rear |
External shoe brake at the gearing on Cardan shaft |
|
|
|
|
Dimensions/Weights |
|
|
Length x Width x Height |
2100 x 800 x 950 mm (82.67 x 31.49 x 37.40 in) |
|
Wheel
Base |
1410 mm
/ 55.51 in |
|
Fuel Tank Capacity |
14
litres / 3.07 gal / 3.69 gal US |
|
Unladen Weight with Full Tank |
130
Kg / 286 lb (192 Kg / 422 lb with original sidecar) |
|
Top
Speed |
110
Kph / 68 mph |
|
|
