Turbo! Here's the story: This BMW R90S in silver smoke color was with the first original owner for 39 years until i had the chance to buy it last year. It comes with a plate spring front suspension, a rigid rear suspension with a sprung saddle, a dual exhaust system, a rear luggage rack, laced wheels, a round headlamp and a dry, single plate clutch.Yes, this is not a mistake. The 1929 BMW R 11 sports an air-cooled, four-stroke, 745cc, twin cylinder powerplant paired to a three-speed manual transmission and can produce a claimed 20 horsepower at 4400 rpm.
The R11 Series 4 was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The front suspension was a plate springe while the rear was equipped with a rigid.
Stopping was achieved via expanding brake (drum brake) in the front and a 37mm cardan brake in the rear. Power was moderated via the two plates-dry. A 78.0mm bore x 78.0mm stroke result in a displacement of just 745.0 cubic centimeters. The engine was a air cooled two cylinder boxer, four-stroke. This R11 displays a total of only 4 kilometres on the odometer, which, presumably, is the distance covered since restoration. Progressively improved, the R11 was built in five series up to 1934. BMW's relatively vibration-free engine was already a byword for smoothness and refinement, and this, coupled to a three-speed shaft-drive transmission, made the R11 sidevalve one of the finest touring motorcycles of its day. The transversely mounted 'flat-twin' engine was already a BMW trademark but for the first time it was installed in a pressed-steel frame, the first model to incorporate this landmark of motorcycle design being the 740cc R11. Shortly after venturing into car manufacture for the first time by acquiring the Dixi works at Eisenach, BMW introduced a major innovation to its motorcycle range in 1929.
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