[spo123]

IF, I am not mistaken.....and I just may be....was there a C,F,O 1977 BMW R100RS model that was early and still did NOT have the 40mm carbs and 40mm exhaust........californikation, florida, oregon......
Possibly, I am thinking of the later R100CS models, with the aforementioned designation....(SMOG).
Either way, an inmate who KNOWS, will be along shortly, to let us all know how incorrect I am....how did that italic type just occur?

I WOULD LOVE THAT MACHINE! It has my initials on it (RS).
Best wishes always.

Update> Thanks, Mugwest, for the confirmation....I neglected the important info on the LARGE VALVES...