R4

R4
Production Model Years
   1932 - 1937

Frame and Engine Numbers

   Frame numbers
    1001 - 10437
    80001 - 97700
    ———
   Engine numbers
    80001 - 95280

 

Model Documentation

 

Model Specifications

Drivetrain
Displacement494cc
Cylinders2
Bore x Stroke (mm)68 x 68
HP @ RPM12 @ 3400
Compression Ratio4.9:1
ValvesSidevalve, 2 per cylinder
ClutchDry, single plate, cable operated
Transmission3 speed, hand shifted
Final DriveDriveshaft
Running Gear
FrameTubular double loop, brazed
Front SuspensionUndamped, trailing link, leaf spring
Rear SuspensionRigid
Front Brakes150mm drum, single leading shoe
Rear BrakesContracting shoe drum on driveshaft, heel operated
Electrical
IgnitionBosch magneto
Spark PlugsBosch W175
GeneratorBosch magneto/generator
Capacities & Measurements
Weight126kg
Fuel14l
Wheelbase1410mm
Top Speed95kph
Number Produced6502
Chassis serial numbers for the R4 had a preceding P as well.

The information provided here was obtained from a variety of public sources and may not reflect official BMW archival data.
Please contact the BMW Archives for official data regarding models.