I am trying to get a 81 QT50 up and running. I think I have narrowed down the problem to a light spark at the plug. I have checked all the fuel things, gas goes into line (new line and filter), carburator cleaned out, air filter replaced, plug is wet with gas after a few turns of the kickstarter. When I pull the sparkplug and touch it on the cylinder head I get either very low spark or no spark at all. Yes I cleaned and whipped of the wet plug. I have even tried a new plug. No change. I have replaced the battery prior to knowing that it would no effect the spark at the sparkplug. I measure volatage between the power wire to the coil and ground. I get somewhere close to 13 volts. But expecting to see a large voltage at the end of the sparkplug cap I can only read millivolt deflections. I am thinking of replacing the coil or trying to figure out if my coil is good. The only think I can think of left to do is the CDI chip if mine has one. Any help would be greatly appreciated. I have downloaded freds list and I am at the end of my knowledge of what to check.