1931 BMW R11 Series 3
| Engine Engine type Bore x Stroke Displacement Valves Compression ratio Max Power Max Torque Fuel system Transmission Final drive Clutch Ignition type Starting system Lubrication Exhaust Spark plug Battery Gear ratios | Air-cooled, 4-stroke, two cylinder flat twin 78.0 x 78.0 mm (3.07 x 3.07 inches) 745 cc Side Valve 5.5:1 18 HP @ 3400 rpm Single carburettor Type SUM CK 3/500 F 1 3-speed Shaft Two plate dry clutch Magneto ignition Kick starter Forced Feed Lubrication Bosch W 175 T1 |
| Dimensions Frame type Castor Overall length Overall width Overall height Wheelbase Seat height Ground clearance Dry weight Fuel capacity Colors Suspension (front) Suspension (rear) Tyre (front) Tyre (rear) Brake (front) Brake (rear) | Twin loop pressed steel frame 2100 mm (78.70 inches) 890 mm (35.03 inches) 950 mm (37.40 inches) 1380 mm (54.33 inches) 828 mm (32.6 inches) 185 mm (7.3 inches) 162 kg 14 litres Black Plate spring 9 laminae Rigid 26 x 3.5 low pressure or 26 x 3.25 high pressure 26 x 3.5 low pressure or 26 x 3.25 high pressure Drum brake 200 mm / 7.87 inches diameter Cardan brake, 55 mm / 2.16 in width |
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