BMW /5 motorcycles
For the 1970 model year, BMW launched three new models having engine capacities of 500 cc (R50/5), 600 cc (R60/5), and 750 cc (R75/5). The R75/5 could reach 110 mph (177 km/h). Model year 1972 saw the introduction of the 15 L (3.3 imp gal; 4.0 US gal) rectangular tank with chrome side panels. For the second half of the 1973 model year, BMW lengthened the rear swingarm 2.5 inch (6.4 cm), resulting in the “long-wheelbase” (LWB) models. This enabled a larger battery, while retaining the kick starter.
The /5 series was the first series to be manufactured completely in Berlin, as by 1969 all of Munich's production capacity was needed for automobiles. "Berlin with its well-trained workforce was an obvious choice. So in 1969 the Berlin Plant started production of the all-new BMW /5 Series, a completely new design and construction following a modular principle all the way from the suspension to the flat-twin power unit.
In 1970, 12,287 units were manufactured and by July 1973, when the /5 model series reached the end production, a significant volume of 68,956 motorcycles had left the Berlin Plant, production increasing five-fold within three years. During this period, BMW manufactured its 500,000th.
In 1974, BMW introduced the “/6” models, which offered front disc brake, revised instrumentation, and a five-speed transmission. The single disc brake was a hybrid cable/hydraulic system, whereby a cable from the handlebar lever actuated the master cylinder underneath the fuel tank. The rectangular tank was dropped.
All /5 models featured both electric starter and kickstarter, with kickstarters remaining available on some BMW motorcycles up to model year 1980.
The /5 models are air-cooled, four-stroke, opposed-twin (boxer) engines with hemispherical combustion chambers. The engine is built around a one-piece tunnel crank-case. The camshaft is driven by a duplex chain and is located below the crankshaft (unlike the /2 series which had the gear-driven camshaft above the crank). This reversed arrangement improves ground clearance for the same center of gravity and assists lubrication of the camshaft. Valves are actuated by the camshaft through hardened followers, push rods, and rocker arms.
The 500 cc and 600 cc models are equipped with Bing slide-type carburetors with 26 mm throats. The R75/5 comes with 32 mm Bing CV (Constant Vacuum/constant depression) type carburetors. As in all BMW motorcycles at the time, the clutch is a single-disk dry clutch.
Final drive is by shaft, running from the transmission by universal joint to an oil bath within the right rear swing arm and connecting to a bevel gear and ring gear on the other end. Unlike the /2 models (with the exception of the 1969 R69US), the /5 models are equipped with telescopic front forks, 12-volt alternator and electrics, and standard tachometer and turn signals.
|R 50/5||R 60/5||R 75/5|
|Bore||67 mm (2.6 in)||73.5 mm (2.89 in)||82 mm (3.2 in)|
|Stroke||70.6 mm (2.78 in)|
|Displacement||498 cc (30.4 cu in)||599 cc (36.6 cu in)||749 cc (45.7 cu in)|
|Power||32 hp (24 kW) @ 6,800 rpm||40 hp (30 kW) @ 6,600 rpm||50 hp (37 kW) @ 6,400 rpm|
|Torque||29 ft·lbf (39 N·m) @ 5,000 rpm||36 ft·lbf (49 N·m) @ 5,000 rpm||43 ft·lbf (58 N·m) @ 5,000 rpm|
|Top Speed||87 mph (140 km/h)||99 mph (159 km/h)||110 mph (175 km/h)|
|Curb Weight||452 lb (205 kg)||463 lb (210 kg)||463 lb (210 kg)|
|Gross Weight Rating||881 lb (400 kg)|
|Alternator||Bosch 12 V • 180 Watts|
|Spark Plugs||Bosch W230T30 / Champion N7Y|
|Fuel Tank||4.7 US gal (18 l; 3.9 imp gal) or 6.3 US gal (24 l; 5.2 imp gal)|
|Tires||3.25x19 front • 4.00x18 rear|
|Rims||1.85x19 front • 1.85x18 rear|
- Forty Years of BMW Motorcycle Production in Berlin-Spandau
- Falloon, Ian (2003). Original BMW Air-Cooled Boxer Twins 1950-1996. MotorBooks International. ISBN 978-0-7603-1424-1.
- Richard Backus (November–December 2009). "10 Days with a 1973 BMW R70/5". Motorcycle Classics. Archived from the original on 8 November 2009. Retrieved 2009-11-11.