I am having troubles pinpointing my ignition problem. It is engine model 990251U s/n W620500. I was not getting any spark and so I replaced Points, condensor, plugs, plug wires, rotor and cap. The coil is 1.53 ohms on the primary and 8960 ohms on the secondary (spec. 7500-8700). I am getting 2.3 ohms across the resistor wire. The ignition voltage at the coil is between 5-6 vdc. The batteries are new, so I am getting 12 vdc at the ignition switch. I momentarily tried to jumper the resistor wire to get the volts up almost 11 vdc on the coil and then I started getting spark. Just questioning the voltage at the coil and the coil itself. Thanks, John