I know this is an old thread, but I wanted to thank the posters in this discussion. I have a Steiner, with the WG600 and over the last few months, it would die, not start or run rough. Last fall it just quit running all together. Needing it for some work recently, I pulled it out of the shed and started my diagnostics without success. I did all the easy things, checked and bypassed safety switches, replaced coil, plugs wires cap rotor. Nothing, no spark to the plugs! After searching the interwebs, I found this thread, started looking at the distributor, random or zero spark. Finally ordered a new distributor, $405 shipped, the ignition module was $340 by itself. Just installed it and the Kubota fired right up! So I'm back in business! Thanks!