1985-1992 BMW K100RS | Retro Review
The 1991 K100RS was blessed with four valves per cylinder and had improved ergonomics for sport touring.
A burger and fries is a great meal once in a while, but you wouldn?t want to make a steady diet of it. BMW riders in the late 1970s were getting tired of the same old menu?air-cooled boxer twin, modest power, dowdy looks?at about the same time as Japanese manufacturers were offering up some pretty tasty in-line fours that were smoother, faster and cheaper than anything from BMW. So the chefs in Bavaria gathered in the kitchen and whipped up a real treat?a liquid-cooled four, laid on its side and clothed in swoopy bodywork?that still tastes good today, and borders on becoming a modern classic as well.
For the July 1992 issue we compared the BMW K100RS to ABS-equipped bikes from Honda and Yamaha. The K100RS threw BMW orthodoxy out the window with its liquid-cooled 987cc four, but toed the company line with a longitudinal crankshaft that aligned with the driveshaft to reduce the power losses typical in drivetrain layouts with several 90-degree changes of direction. With the head on the left and the crankcase on the right, routine maintenance like adjusting the valves was simplified.
Optional hard luggage and comfortably sporty ergonomics made the K100RS a solid sport-touring pick.
The ?brick? engine was fed by Bosch LE-Jetronic fuel injection in place of the carburetors that had fueled generations of boxers, and two valves per cylinder were deemed appropriate to the bike?s ...
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