Long time user, minimal poster but I’m out of my league with this issue. I tried searching the forum for this issue but was unable to find anything helpful. I recently picked up a 77 Motoski futura 400 (twin to an Everest I’ve found?) in awesome shape and I’m trying to bring it back to life. At some point Someone has replaced the original 400 with a 440f/c. Dumped all the old fuel, cleaned the carb, replaced all the fuel lines and primer, new plugs, wires and caps. Filled with new fuel gave it two pulls and she fired right up and ran great. Turned it off to replace the sticky throttle cable and then fired it back up. Ran great....for about 10min.....then just died like someone hit the kill switch. Found No spark on both sides, noticed one of the kill switch wires was not in the greatest shape and the red wire from the voltage regulator broke off so I Unplugged the switch/light harness and checked for spark again and still nothing. So now I’m stuck scratching my head looking at this polarfire CDI I know nothing about. How do I begin to test this thing? This is the 017 polarfire. All the wiring going to the cdi is in good shape. This is new one for me and any help would greatly appreciated. Thanks.