1934 BMW R4 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, single cylinder vertical 84.0 x 78.0 mm (3.30 x 3.07 inches) 398 cc (24.32 cubic inches) OHV 5.7:1 11.96 HP (8.8 kW) @ 4000 rpm 1 x carburettor type SUM CK 3/500 Fr 4-speed with frame shift gate Shaft Dry, single plate, cable operated Battery ignition Kick starter Forced Feed Lubrication Bosch DM 175/1 |
| 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) | Pressed steel duplex frame 1980 mm (77.95 inches) 850 mm (33.46 inches) 950 mm (37.40 inches) 1300 mm (51.11 inches) 828 mm (32.6 inches) 185 mm (7.3 inches) 137 kg 12 litres Plate spring, 9 laminae with friction shock absorber Rigid 26x3.5 on 19x3 26x3.5 on 19x3 Drum brake 180 mm / 7.08 inches diameter Drum brake 180 mm / 7.08 inches diameter |
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