I just recently replaced the engine with one out of another machine. I fired it up a couple of times. The last time I started it, it ran for about 30 seconds and then lost spark. Checked the kill switch and it is working fine. Any ideas will help...Thanks!
Check high tension leads. Also, the plugs from the start button (red/brown & black/white wires) you should cut them out and solder the wires together. See how you go with that. Also, check how much volts you loose while cranking over.