1977 BMW R100S Frame no. 6160001 Engine no. 6160001 • Fully matching numbers • BMW R100S prototype • Serial number 6160001 • Restored about 2000 miles ago In the 1970s, while the motorcycle trend was 4-cylinders powered bike, especially with the huge presence of Japanese makers on the market, BMW engineers stayed true to themselves and kept developing their famous boxer-twin. The main instrument of engine development for the Bavarian company was to increase the bore diameter. The 750cc engines had a bore of 82mm, the 900, a bore of 90mm and finally, in 1977, to release their new 980cc engine, they took the bore to 94mm. Not only did the new BMW R100 line was offering a bigger power to BMW riders, it was also fixing some mechanical-safety issues from the R90. Indeed, one of the biggest problem BMW had was linked to the increase of power while keeping the same engine structure. It gave a tendency to the R90 to blow its oil an obviously cause some important safety issues. To address this, BMW developed a whole system made of a spring-loaded flapper disc and a small baffle chamber in the crankcase, so oil would be contained inside the engine instead of just blowing everywhere. Other than this, the clutch was upgraded too, and more importantly, the frame was strengthened. The 38mm Dell'Ortos from the R90S were replaced by 40mm Bing constant-vacuum carburetors, offering a little less throttle response but a much better fuel economy and efficiency in terms of emission and riding. Just like the R90S, the R100S was offered with the small 'bikini' fairing, offering protection and aerodynamism so the rider could choose between a relaxed or spirited ride. Although the R100 was obviously mass produced, the motorcycle we are presenting here is unique. In fact, that R100S is the model prototype. Built in May 1976 and gifted with the serial number 6160001 (both frame and engine), the bike kind of had many lives. First sent to the US for publicity and display, and featured in many motorcycle magazines, the bike was then race-prepped to compete in the Battle of the Twins in Daytona, where it finished 20th. After being switched back to a street bike, at around 64k miles, the 2nd owner started a restoration for the bike, but had to cancel the project due to a fire in his garage. From there, a line mechanic from BMW San Jose acquired the bike and performed an exacting cosmetic and mechanical restoration. It has been ridden for about 2000 miles since then. The fully matching numbers bike comes with a collection of related magazines, race programs and receipts. Fußnoten As with all Lots in the Sale, this Lot is sold 'as is/where is' and Bidders must satisfy themselves as to the provenance, condition, age, completeness and originality prior to bidding.
1977 BMW R100S Frame no. 6160001 Engine no. 6160001 • Fully matching numbers • BMW R100S prototype • Serial number 6160001 • Restored about 2000 miles ago In the 1970s, while the motorcycle trend was 4-cylinders powered bike, especially with the huge presence of Japanese makers on the market, BMW engineers stayed true to themselves and kept developing their famous boxer-twin. The main instrument of engine development for the Bavarian company was to increase the bore diameter. The 750cc engines had a bore of 82mm, the 900, a bore of 90mm and finally, in 1977, to release their new 980cc engine, they took the bore to 94mm. Not only did the new BMW R100 line was offering a bigger power to BMW riders, it was also fixing some mechanical-safety issues from the R90. Indeed, one of the biggest problem BMW had was linked to the increase of power while keeping the same engine structure. It gave a tendency to the R90 to blow its oil an obviously cause some important safety issues. To address this, BMW developed a whole system made of a spring-loaded flapper disc and a small baffle chamber in the crankcase, so oil would be contained inside the engine instead of just blowing everywhere. Other than this, the clutch was upgraded too, and more importantly, the frame was strengthened. The 38mm Dell'Ortos from the R90S were replaced by 40mm Bing constant-vacuum carburetors, offering a little less throttle response but a much better fuel economy and efficiency in terms of emission and riding. Just like the R90S, the R100S was offered with the small 'bikini' fairing, offering protection and aerodynamism so the rider could choose between a relaxed or spirited ride. Although the R100 was obviously mass produced, the motorcycle we are presenting here is unique. In fact, that R100S is the model prototype. Built in May 1976 and gifted with the serial number 6160001 (both frame and engine), the bike kind of had many lives. First sent to the US for publicity and display, and featured in many motorcycle magazines, the bike was then race-prepped to compete in the Battle of the Twins in Daytona, where it finished 20th. After being switched back to a street bike, at around 64k miles, the 2nd owner started a restoration for the bike, but had to cancel the project due to a fire in his garage. From there, a line mechanic from BMW San Jose acquired the bike and performed an exacting cosmetic and mechanical restoration. It has been ridden for about 2000 miles since then. The fully matching numbers bike comes with a collection of related magazines, race programs and receipts. Fußnoten As with all Lots in the Sale, this Lot is sold 'as is/where is' and Bidders must satisfy themselves as to the provenance, condition, age, completeness and originality prior to bidding.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
