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  2. Flat-twin engine - Wikipedia

    en.wikipedia.org/wiki/Flat-twin_engine

    A flat-twin engine is a two-cylinder internal combustion engine with the cylinders on opposite sides of the crankshaft. The most common type of flat-twin engine is the boxer-twin engine, where both pistons move inwards and outwards at the same time. The flat-twin design was patented by Karl Benz in 1896 and the first production flat-twin engine ...

  3. BMW R12 and R17 - Wikipedia

    en.wikipedia.org/wiki/BMW_R12_and_R17

    3.5–4 litres per 100 kilometres (81–71 mpg ‑imp; 67–59 mpg ‑US) [1] The BMW R12 and R17 are flat-twin engine motorcycles made by BMW Motorrad from 1935 through 1942. They were developed in 1935 based on the R7 concept of 1934. [3][4] A few hundred R17s were made, ending in 1937, while the R12 continued through 1942, with a total of ...

  4. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  5. Engine configuration - Wikipedia

    en.wikipedia.org/wiki/Engine_configuration

    Douglas flat-twin motorcycle engine. Flat engines (also known as "horizontally-opposed" or "boxer" engines) have the cylinders arranged in two banks on either side of a single crankshaft. Types of flat engines include: Flat-2, commonly called "flat-twin" Flat-4; Flat-6; Flat-8; Flat-10; Flat-12; Flat-16

  6. History of BMW motorcycles - Wikipedia

    en.wikipedia.org/wiki/History_of_BMW_motorcycles

    The R Series range of flat-twin models was also updated in 2004, beginning with the BMW R 1200 GS dual-sport, which was powered by a new 1,170 cc (71 cu in) "oilhead" engine. This was followed by the 2005 BMW R 1200 ST sport-tourer, the 2005 BMW R 1200 RT tourer, the 2006 BMW R 1200 S sport-tourer, and the 2006 BMW R 1200 R naked bike.

  7. Motorcycle frame - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_frame

    A motorcycle frame is a motorcycle 's core structure. It supports the engine, provides a location for the steering and rear suspension, and supports the rider and any passenger or luggage. Also attached to the frame are the fuel tank and battery. At the front of the frame is found the steering head tube that holds the pivoting front fork, while ...