My 70 shovel is a kicker only. I built it from ground up with mostly used parts. She starts easy cold then flames out from time to time when idling at a signal then she won't restart. Have replaced carb, petcock, fuel filter and fuel line, ignition, wires, spark plugs, vented gas caps, and coil. I'm not sure what the correct coil should be and suspect it may be the problem. The motor doesn't miss a beat on the road. From time to time I have recovered the flame out with a quick twist of the throttle which really confused the issue with electrical problem or fuel problem. I would appreciate any input. Thanks.