Happy, Yes, correct. The secondary sheave opens as the primary sheave close`s. A very smooth system. has been the system of choice on snow mobiles with over 100 hp. even being used in many new cars, as far as i know, the belt inside the transmission of the cars. The cvt bolts on the engines with the 76mm clutch shoes/78mm clutch drum, this covers many popular/current motors. Use`s centrifical clutch, no cables etc involved. Ron