As with other models in the F-series range, the F800GT uses a 798 cc (48.7 cu in) parallel-twin engine, codeveloped by BMW and Rotax. The engine has a 360° firing order which produces an exhaust note reminiscent of BMW's signature air-cooled boxer twins. However, this firing order requires both pistons to move up and down at the same time. To counter the significant inertia produced by the pistons reciprocating, BMW devised a third vestigial connecting rod to a balance weight. The result is a parallel twin with significantly reduced vibration compared to other parallel twin engine designs. The engine is lubricated by a dry sump system.
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