This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1980 BMW R100RT is a Canadian-market bike that was purchased new by the seller’s father and inherited by his brother in 1983. The bike has not been ridden since and was recently recommissioned by the seller. It is powered by an air-cooled 980cc opposed twin with a 5-speed transmission, and over the last year the carburetors and cylinder heads were rebuilt, the rear main seal and drive line seals replaced, both master cylinders rebuilt, and a new clutch, brake pads, and tires added. 22k miles are shown, of which approximately 1,000 have been added by the seller. This R100RT is offered at no reserve with factory supplied hard cases and a clean Washington title in the seller’s name.
The bodywork is finished in a metallic brown with a white lower fairing and side covers. Features include a taller aftermarket windscreen and factory supplied hard cases. Paint loss can be seen on the lower fork legs and valve covers, and the R100RT emblem is missing from the seat cowl. During the recommissioning, new throttle cables, a Westco battery, and Progressive shocks were added.
The forks were rebuilt with new seals, the steering head bearings lubricated, and the brake pads replaced. Both master cylinders and the rear caliper were rebuilt, and stainless steel brake lines added. Cast alloy “Snowflake” wheels are fitted with new Metzeler tires.
Instrumentation consist of a speedometer, tachometer, voltmeter, and a clock. Per the seller, the bike was purchased new in Canada. The speedometer previously read in kilometers but has since been replaced with one that reads in miles. 22k miles are currently shown on the odometer.
The air-cooled 980cc opposed twin was factory rated at 70 horsepower and is coupled to a 5-speed transmission with shaft drive. The seller states that within the past year the cylinder heads and carburetors were rebuilt, the rear main seal replaced, and a new clutch, ignition booster, and air filter added. The transmission was also rebuilt with new seals, shift springs, neutral switch, and rear drive seals. No service records are available, as all work was performed by the seller himself.