This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1965 BMW R50/2 is finished in black and is powered by a 494cc boxer-twin paired with a 4-speed manual transmission with shaft drive. The bike has reportedly spent its life in California and was acquired by the current owner in 2018 after several years in storage with the previous owner. The bike is equipped with bar-end turn signals, drum brakes, Magura grips, and a Pagusa solo seat. In preparation for sale the bike was serviced, including fitment of new fuel hoses and cleaning of the carburetors and fuel shutoff valve. This R50/2 is offered on behalf of the current owner with a clean California title.
The black finish is accented by white pinstriping, and the seller notes touch-ups and chips that expose underlying brown primer. The wire wheels incorporate 200-millimeter drum brakes, chrome spokes and rims, and are fitted with tires that are approximately fifteen years old. Older registration stickers are noted on the California black license plate.
The bike is equipped with a Pagusa solo seat, though based on paint wear on the rear fender the seller believes the bike may have been previously fitted with either a pillion or a tandem seat. Other equipment includes Magura rubber grips, bar-end turn signals, and headlight-housing-mounted mirrors.
The 120-mph speedometer contains a 5-digit odometer and a trip odometer. Just over 15k miles are shown, and the bike has been ridden only a handful of miles by the seller. The seller notes that the steering lock key and tool kit key are missing.
The 494cc flat-twin was factory rated at 26 horsepower, which is sent to the rear wheel via a 4-speed transmission and shaft drive. Recent services include fitment of new fuel hoses and cleaning of the carburetors and fuel shutoff valve, although the seller notes that the bike would likely benefit from additional carburetor tuning.
A cold-start video is viewable above.