In 1991, BMW enhanced the K100's engine displacement from 987 cc to 1,097 cc, leading to the introduction of the K1100 model. The K1100LT became the initial variant equipped with the upgraded engine. Subsequently, in 1998, BMW once again increased the engine size, this time to 1,170 cc. The improved flat-four engine debuted in the K1200RS and remained in production for the K1200LT series. A power-boosting update in 2004 marked the continuation of this engine until the conclusion of the K1200LT production run.
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