This Wico Series C mag is an original piece from a swap meet. It drives off the cam gear, on the same system as the crank gear; 2:1 reduction gearing in the magneto keeps it spinning at half crank speed (equal to cam rotation). The Wico is infinitely adjustable; Max Jr. set it up for about 24 to 26 degrees advanced timing. Although, much higher than that and he's risking detonation, he warned. There is hardly any room between the Wico and the oil filter and pump, so the pump was repositioned, the delivery hole plugged, and the line rerouted to the other side of the assembly.