Hi msrfan. Im doing a build for my girlfrind with a 3hp Briggs. It will be a belt primary (centrifugal clutch) and chain secondary. My rear sprocket is 44 tooth, i think my clutch pulley is 2 inches (standard). Could you advise a jackshaft pulley and sprocket size? I think you usually use sheaves, if so could you advise me of a recommended reduction? Any help would be greatly appreciated. You definitely seem to know your way around these Briggs. The bike is in boardtrack and vintage section, if you havent seen it have a look. If im doing something wrong or maybe the angle of the motor is too severe i would definitely listen to and value your input. Thanks heaps