I had a '77 R100S that we built in .......1977....
It was a lot of fun playing Go-Fast up on Skyline and down Hwy 1 back then on the beast. The first bike that I ever had that would out run its brakes. A new learning curve that had to be quickly mastered as it got to the next corner so damn fast. The only problem that I remember having was that it was very hard on exhaust valve seats.