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R 4 Series 1
   
. Data sheet
. Back to Models
Production
Begin of the Production   1932
End of the Production   1932
Numbers Produced   1101
Price   1.250,- RM
Engine
Internal Designation   M 69 S 1
Motor Type   four-stroke single-cylinder vertical
Bore x Stroke   84 x 78 mm
Displacement   398 ccm
Max Power   12 hp at 4000 rpm
Compression Ratio   5.7 : 1
Valves   ohv
Carburetion System   1 x carburettor type SUM CK 3/500 Fr
Engine Lubricating System   forced-feed lubrication
Oil Pump   gear pump
Power transmission
Clutch   single-plate, dry
Number of Gears   3
Shifting   manual
Gearbox Ratios   2.9 / 1.5 / 1
Rear Wheel Ratio   1 : 5.11 (with sidecar 1 : 5.63)
Bevel / Crownwheel   9 / 46 teeth (with sidecar 8 / 45)
Electrical system
Ignition System   battery ignition
Generator   Bosch 6 V/30 W
Spark Plugs   Bosch DM 175/1
 
Chassis
Designation   F 69 S 1
Frame   pressed steel duplex frame
Front Wheel Suspension   plate spring, 9 laminae, from July with friction shock absorber
Rear Wheel Suspension   rigid
Wheel Rims   26 x 3.5
Tyres front   26 x 3.5 SS
Tyres rear   26 x 3.5 SS
Brakes front   drum brake Ø 180 mm
Brakes rear   drum brake Ø 180 mm
Dimensions / Weights
Length x Width x Height   1980 x 850 x 950 mm
Wheel Base   1300 mm
Fuel Tank Capacity   10 l
Unladen Weight, Full Tank   137 kg
PermittedWeight Limit   200 kg
Fuel Consumption   approx. 3,5 l/100 km
Oil Consumption   approx. 1 - 2 l/1000 km
Top Speed   100 kph