Replaced plug and magneto but still no spark. Wonder if it has anything to do with the wiring that relates to the yellow wire attached to the magneto? Could I either disconnect the wire or ground it to bypass any issues with the wiring (safety switches failing, perhaps) I tried it both ways but nothing changes. Engine turns over fine but if I ground the plug to the block I can see no spark. Both the magneto and the plug should be gapped properly.