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A straight-twin engine, also known as an inline-twin, vertical-twin, inline-2, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include automobiles, marine vessels, snowmobiles, jet skis , all-terrain vehicles ...
In a parallel twin, both pistons reach top dead center at the same time. In a parallel twin where the pistons move up and down at the same time, the crankshaft angle is 360 degrees.
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
Unlike Yamaha's earlier vertical XS650, the TX750's engine was a forward inclined air-cooled parallel twin with a 360° crankshaft, a chain-driven single overhead cam, and two valves per cylinder. The engine was aluminum with a horizontally split crankcase and steel liners in the cylinder bores.
The BMW F series is a family of parallel-twin engine dual-sport motorcycles manufactured in Berlin, Germany by BMW Motorrad. Launched in 2008, the range comprises the F650GS, F700GS, F800GS, and F800GSA. In 2012, the F700GS replaced the discontinued F650GS, and in 2013, the F800GSA was introduced with a 24-litre (5.3 imp gal; 6.3 US gal) fuel ...
Straight-twin motorcycle engines (a.k.a. "parallel-twin" and "vertical twin") historically came in two types, neither of which were "cross plane": 360° cranks with their pistons moving in tandem, or 180° cranks with their pistons moving in opposite phase.
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 was used in the Lanchester 8 hp Phaeton car released in 1900. The flat-twin engine was used in several other cars since ...
Numerous motorcycle engines— particularly parallel-twin engines— have employed balance shaft systems, for example the Yamaha TRX850 and Yamaha TDM850 engines have a 270° crankshaft with a balance shaft. An alternative approach, as used by the BMW GS parallel-twin, is to use a 'dummy' connecting rod which moves a hinged counterweight.
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