The 102 has a spacer plate between the bottom of each cylinder and the crankcase, to accomodate the increased stroke crankshaft that took the original 5.8 cubic inch BME out to 6.2 cu. in. (102 cc). BME later updated the crankcase (the EVO) that, among other things, eliminated the need for the spacer plates, and also accomodated a new twin petal higher flowing reed assembly, which added a bit more power.