Abstract: A self adjusting camshaft gear including an inner hub member and a coaxial outer gear-supporting member that is rotatably mounted to the periphery of the hub member. Weighted levers pivotally mounted to the side face of the outer gear member overlie a portion of the coplanar side face of the hub member and pivotally engage posts extending therefrom so that movement of the weighted levers around their gear member pivots will change the relative position of the hub with respect to the outer gear member and thereby advance or retard the camshaft. Springs between the levers and the hub member force the levers inward and into a normally advanced position for optimum power at low r.p.m. At some mid-range r.p.m. as determined by the spring modulus, the weighted levers are centrifugally forced outward to alter the rotational position of the hub with respect to the outer gear member to thereby retard the timing of the camshaft for optimum power at high r.p.m.