This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1978 BMW R100RS is finished in Gold Metallic and powered by an air-cooled 980cc boxer twin paired with a five-speed transmission and shaft drive. The bike is equipped with an RPM top triple clamp, fork springs, gusseted swingarm, and frame bracing, and a deep-sump oil pan. A July 2016 service included flushing the brake and fuel systems, replacing the rear master cylinder, rebuilding the carburetors, and fitting new ignition components. The front fork was serviced, and new Ikon rear shocks were installed in October 2019. The five-digit odometer shows less than 36k miles, approximately 12 of which have been put on by the seller in two months of ownership. This R100RS is offered at no reserve with a service manual, tool roll, removable hardshell panniers, and a clean California title in the seller’s name.
Finished in Gold Metallic (046), this R100RS is equipped with an RPM top triple clamp, fork springs, gusseted swingarm, and frame bracing. Removable hardshell panniers are included and attach to a set of black tubular mounting brackets. A new headlight bulb was fitted in October 2019.
Snowflake-style aluminum wheels are wrapped with 100/90V19 front and 120/90V18 rear Metzler Lasertec tires that were installed in July 2016. A brake system flush was performed, and the rear master cylinder was also replaced at that time. The front fork was serviced with new seals, wipers, and boots, and the rear shocks were replaced with Ikon units in October 2019. Stainless brake lines are fitted.
Instrumentation sits behind a full front fairing and includes a 9k-rpm tachometer, a voltmeter, analog clock, and 140-mph speedometer. Taller handlebars and the factory steering damper are mounted, and the five-digit odometer shows 36k miles.
A fuel tank flush, replacement of fuel lines, and rebuilding of the carburetors was performed in July 2016, and power comes from a 980cc air-cooled boxer twin equipped with a Dyna electronic ignition module and deep-sump oil pan. A five-speed manual transmission sends power to the rear wheel via shaft drive. The spark plugs, diode board, voltage regulator, ground wire, and battery were replaced in July 2016 to address a charging issue, and an oil and filter change was performed in October 2019.
Service records dating back to 2016, a tool roll, and service manual are included. A start-up and riding video can be viewed below.