Motorcycle Repair: shovel will not stay running, mr wells, hey mr

Question
QUESTION: Hey MR Wells...1975 shovel. one day I was riding down the road and the bike just died. let it sit for a while and it started back up and ran for several minutes and then died again. got it home charged the battery and tried to start it again.....now it will run for about 30seconds and then just BOOM die..try to start it again right away and it has a massive backfire but will not start....it has an electronic ignition in it (no points)..any ideas. The battery is in fine condition....coil? regulators&s carb? any help would be appreciated

ANSWER: Once it quits running, pull a plug and holding it to the head, are you getting spark?
Mike

---------- FOLLOW-UP ----------

QUESTION: Yes there is a spark

ANSWER: I would start by doing a OHms test on the coil to make sure its good. Do it when its cold and then hot. You can heat it in the oven to do the hot test.
Next I would check the carb. You might have a plugged jet or a sticking float.
Last, the ignition might be bad. It might be failing when hot.
Good luck and happy riding
Mike

---------- FOLLOW-UP ----------

QUESTION: how do I do the ohms test?  also what should the oil pressure be when running?  thanks again

Answer
The positive side of the coil, where the two 12 wires attach, you should show around3 OHMs. On the other side, where the plug wires attach, you should show around 20,000 OHMs. Both should be about the same hot or cold.
Good luck and happy riding
Mike