Just came across a snapper Sr. No. 2312373 with a B&S motor; Model No. 28D707 type 0025-01,Code: 080610ZA. The motor is a 11.5 hp...all research shows this mower came with an 8 hp. motor..? Need to find a wiring digaram for connecting dual circut wires to ignition swith and push button starter? Any suggestions?