BMW R4 1934 400cc 1 cyl ohv 

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    BMW R4 1934 400cc 1 cyl ohv

    Manufacturer: BMW
    Model: R4
    Year: 1934
    Capacity: 398cc
    Engine type: 4-stroke / ohv
    Cylinders: 1
    Power: 14hp
    Weight: 137kg

    Frame number: P1365D
    Engine number: 83158



    Introduced in 1932 and intended to bridge the gap between the 'budget' BMW R2 198cc single and the expensive twins, the R4 looked much like the former, whose channel-section steel frame and running gear it used almost unaltered. The 398cc overhead-valve engine featured enclosed valve gear and produced 12bhp, gaining an extra two horsepower in 1933 when the BMW R4 was updated to Series 2 specification with revised styling and a four-speed gearbox. A new cylinder head, tidier engine casings and changes to the toolbox and generator locations were introduced as the rugged R4 - a favourite with police forces and the German Army - progressed through to Series 5 before production ceased in 1936.

    BMW produced 15,295 R4 motorcycles using innovative mass production techniques, setting new standards of design and quality. Pressed steel frame and components were quick and easy to stamp out and assemble, reducing manufacturing costs.

    This well running and restored BMW R4 is equipped with a complete Bosch electric system and a Veigel speedo.

     

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