The 1972 BMW R75/5-based MeGa 1 cafe-racer While looking around for some interesting old BMWs, we happened to come across the MotoEuro website, where we found this MeGa 1 caf racer. The MeGa 1s engine, which makes 85bhp, is based on an R100GS mill thats been completely rebuilt ported and polished heads, new valves, new cams, 38mm Mikuni carbs with velocity stacks, modified Luftmeister 2-into-1 header, Supertrapp muffler, high performance coils, ignition booster, electronic regulator and a lot of other bits and pieces.