Abstract: A lightweight centrifugal friction clutch for transmitting torque from an input source to an output shaft, which includes a wheel secured for simultaneous rotation with the output shaft, a clutch band encircling the wheel and secured within a clutch housing rotationally driven by the input source, and a centrifugal mechanism and cam for tightening the clutch band about the wheel for frictional contact and simultaneous rotation therewith. The centrifugal mechanism includes one or more weights positionable on a centrifugal arm, an actuating arm which rotates a cam member, and an adjustment linkage between the two arms. The particular rotational speed at which the clutch engages may be altered by adjusting the tension against a biasing spring that operates against the centrifugal mechanism, by replacing the spring, or by altering the lever action of the centrifugal mechanism by varying the attachment points of the adjustment linkage between the two arms.