This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1978 BMW R100/7 is powered by a replacement 1,000cc horizontal twin reportedly sourced from an R100RS and featuring an upgraded camshaft, flowed dual-plug cylinder heads, electronic ignition, a deep sump, and a 2-into-1 exhaust system. Additional modifications include an RS front end with dual disc brakes, Progressive springs, and a shouldered alloy rim. The seller has ridden the bike 1,500 miles since purchasing it two years from the previous owner, reportedly a marque specialist who performed the modifications. Subsequent service included replacement of the battery, a valve adjustment, re-torquing the cylinder heads, and fluid changes. This R100 is sold with a clean South Carolina title in the seller’s name.
The 6.3-gallon fuel tank is finished in black paint with gold pinstriping and features replacement BMW roundels, while factory-style decals remain affixed to the side covers. The frame is believed by the seller to have been refinished under previous ownership. The seat has been reupholstered, an aftermarket side stand has been added, and the front and rear turn signals deleted. A walk-around video has been provided by the seller.
The forks and front brakes were sourced from an R100RS and feature Progressive springs, dual discs, and stainless steel lines. The front wheel uses a shouldered D.I.D. rim, while the rear is a standard BMW item. Both wheels were reportedly rebuilt with vapor-blasted hubs and stainless steel spokes by Buchanan’s Spoke & Rim. The tires are older Michelins, but the seller has offered to replace them with the buyer’s choice before delivery.
Controls and instruments remain stock, including a 140-mph speedometer and a tachometer with a 7k-rpm redline. Approximately 34k miles are shown on the 5-digit odometer, 1,500 of which have been added by the seller.
The air-cooled 1,000cc opposed twin was reportedly sourced from a R100RS by the previous owner, who modified it with a performance cam, flowed twin-plug cylinder heads, Dyna electronic ignition, a deep sump, and a 2-into-1 Luftmeister exhaust system. The seller recently installed a gel cell battery, adjusted the valves, re-torqued the heads, and changed the fluids.
A cold start video is provided above. Power is sent to the rear wheel through a 5-speed transmission and shaft drive. The current and previous owners are said to have performed all work personally, leaving service records unavailable.