An expanding clutch disk for use in a clutch of the type having a clutch basket with fingers and slots, and driven and driving plates (517, 518), said expanding friction disk comprising: a generally planar and circular first plate with an inner and an outer surface, with said first plate inner surface defining at least one generally rectangular ramp, said ramp having a ramped bottom surface, with said ramp being deepest toward the center of the circular first plate, and less deep toward the periphery of said circular fist plate, with said ramp oriented transverse to a radial line from the center of said circular first plate; a plurality of centrifugal actuating members adjacent to said first plate, with said actuating members having a first side and a second side, with said first side defining one or more pin sockets configured for receiving a cylindrical pin in each centrifugal actuating member; and a generally planar and circular second plate with an inner and an outer surface, with said second plate inner surface facing said plurality of centrifugal actuating members; with said first and second plates attached to each other by a plurality of springs, and with said plurality of centrifugal actuating members configured to move by centrifugal force in a radial direction toward the periphery of said first and second plates, with said plurality of springs urging said plates closer to each other by pressing said cylindrical pin into said deeper region of said ramp, and with said plates configured to move apart due to centrifugal force pressing said centrifugal actuating members toward a periphery of said plates and thus causing said cylindrical pins to move into a less deep portion of said ramp, and forcing said plates apart, with said plates and centrifugal actuating members moving over each other by rolling engagement of one or more pins captured between said ramps and said pin sockets. a generally planar and circular first plate with an inner and an outer surface, with said first plate inner surface defining at least one generally rectangular ramp, said ramp having a ramped bottom surface, with said ramp being deepest toward the center of the circular first plate, and less deep toward the periphery of said circular fist plate, with said ramp oriented transverse to a radial line from the center of said circular first plate; a plurality of centrifugal actuating members adjacent to said first plate, with said actuating members having a first side and a second side, with said first side defining one or more pin sockets configured for receiving a cylindrical pin in each centrifugal actuating member; and a generally planar and circular second plate with an inner and an outer surface, with said second plate inner surface facing said plurality of centrifugal actuating members; with said first and second plates attached to each other by a plurality of springs, and with said plurality of centrifugal actuating members configured to move by centrifugal force in a radial direction toward the periphery of said first and second plates, with said plurality of springs urging said plates closer to each other by pressing said cylindrical pin into said deeper region of said ramp, and with said plates configured to move apart due to centrifugal force pressing said centrifugal actuating members toward a periphery of said plates and thus causing said cylindrical pins to move into a less deep portion of said ramp, and forcing said plates apart, with said plates and centrifugal actuating members moving over each other by rolling engagement of one or more pins captured between said ramps and said pin sockets.