BMW R 69 S

From 1955 to 1969, 15,347 of these 594 cc shaft-drive, opposed twin motorcycles were built. The 35 hp (26 kW) R69 was produced from 1955 to 1960, the 42 hp (31 kW) R69S was produced from 1960 to 1969,[1] and the 42 hp R69US was produced from 1968 to 1969.[2] These models were designed as relatively high powered, high compression sport bikes, although the Earles forks R69 and R69S came with sidecar lugs installed on the frames. These lugs were deleted from the telescopic fork "US" models. The low compression 30 hp (22 kW) R60/2, produced from 1955 to 1960, was designed primarily for sidecar use, though it was popularly used as a solo bike, along with the 30 hp R60US, which was produced between 1968 and 1969.

R69S Specifications. (R69 specifications shown in parentheses when different from the R69S[4])

    Start of Production — 1960     (1955)

    End of Production — 1969     (1960)

    Numbers Produced — 11,317     (2,956)

Engine

    Internal Designation — 268/3     (268/2)

    Motor Type — Four-stroke two cylinder flat twin

    Bore × Stroke — 72 × 73 mm (2.83 × 2.87 in)

    Displacement — 594 cc

    Max Power — 42 hp/31 kW at 7000 rpm     (35 hp/26 kW at 6800 rpm)

    Compression Ratio — 9.5:1     (7.5:1)

    Valves — OHV

    Carburation System — 2 carburetors, Type Bing 1/26/75-1/26/76 or 1/26/91-1/26/92     (1/26/9-1
    /26/10)

    Engine Lubricating System — Forced feed lubrication

    Oil Pump — Gear pump

[edit] Power Transmission

    Clutch — Single plate, saucer spring, dry

    Number of Gears — 4

    Shifting — Foot shifting

    Gearbox Ratios — 4.17/2.73/1.94/1.54     (5.33/3.02/2/04/1.54)

    Rear Wheel Ratio — 1:3.375 or 1:3.13; with sidecar 1:4.33     (1:3.18 or 1:4.25 sidecar)

    Bevel/Crownwheel — 8/25 or 8/27 teeth; with sidecar 6/26     (11/35; 8/34 sidecar)

[edit] Electrical System

    Ignition System — Magneto ignition

    Generator — Bosch LJ/CGE 60/6/1700 R     (Noris L 60/6/1500L)

    Spark Plugs — Bosch W260T1 or Beru 260/14     (Bosch W240T1)

[edit] Chassis

    Designation — 245/2     (245/1)

    Frame — Double loop steel tubular frame

    Front wheel suspension — Earles fork with suspension units and oil pressure shock absorbers

    Rear wheel suspension — Long swing arm with suspension units and oil pressure shock absorbers

    Wheel rims — Deep bed 2.15B × 18; with sidecar, rear 2.75C × 18

    Tires, Front — 3.5 × 18 S

    Tires, Rear — 3.50 S (4 × 18 S with sidecar)

    Brakes, Front — Drum brake 200 mm (7.9 in) diameter duplex full hub

    Brakes, Rear — Drum brake 200 mm (7.9 in) diameter simplex full hub

[edit] Dimensions/Weights

    Length × Width × Height — 2125 × 722 × 980 mm; / 83.66 × 28.42 × 38.58 in

    Wheel Base — 1415 mm/55.7 in; with original sidecar 1450 mm/57.1 in

    Fuel Tank Capacity — 17 liters / 3.73 gallon / 4.49 gallon US

    Unladen Weight with Full Tank — 202 kg/450 lb; with original sidecar 324 kg/710 lb

    Idle/Riding Noise — 84/82 DIN phon; from 13 September 1966: 78/84 dB(A)

    Load Rating — 360 kg/790 lb; with original sidecar 600 kg/1,300 lb

    Fuel Consumption — 5.3 liters/100 km / 44 mpg (US)     (3.6 liters/100 km / 64 mpg (US))

    Oil Consumption — 0.5 - 1 liters/1,000 km approx.

    Top Speed — 175 km/h/109 mph     (165 km/h/103 mph)