This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1988 BMW R100GS is an on-road/off-road adventure touring motorcycle which is powered by a 980cc boxer twin paired with a five-speed transmission and shaft drive. Equipment includes a Siebenrock reproduction seat, an oil cooler, Bing carburetors, upgraded brakes, an Öhlins rear shock, and replacement valve covers. The bike was purchased three years ago by the seller, who owns a BMW motorcycle service shop and most recently performed service including fluid changes and a valve check. This R100GS shows 12k miles and is offered with factory side cases, a rear rack, a removed stock seat, and a clean California title in the seller’s name.
The R100GS featured a six-gallon steel fuel tank as well as plastic fenders and bodywork from the factory. The front fairing on this example was repainted and fitted with replacement blue graphics under previous ownership according to the seller. Accessories include BMW side cases, a rear rack, and engine protection bars.
A Siebenrock reproduction seat has been fitted, and the seller will also include a stock BMW seat with a tear in its vinyl. The frame is shown with the seat and fuel tank removed in the gallery below.
Wire-spoke wheels are mounted with Continental Twinduro tires. The bike is equipped with a big brake kit featuring a Brembo caliper up front as well as a replacement Öhlins shock tuned for an average-weight rider in the rear.
The fairing shields a 120-mph speedometer, a clock, warning lights, and a tachometer. Approximately 12k miles are shown on the five-digit odometer.
The 980cc boxer twin produced 60 horsepower from the factory and features 40mm Bing carburetors and an external oil cooler as well as a replacement BMW muffler and valve covers. A five-speed transmission sends power to the rear wheel via shaft drive. Recent service is said to have included a valve check and fluid changes several months ago.
The sale includes BMW tools in a vinyl roll.
A cold-start video provided by the seller is shown below.