Quote Originally Posted by jforgo View Post
I meant, is there spark when this occurrence happens, and you can't get it started? Issues with the ignitor, bean can, or especially ignition switch can appear and disappear seemingly randomly. It makes no difference if you had successfully adjusted timing recently, where the failure event is somewhat random. If you take an inline spark checker with you, you can check for spark right after it dies and won't start. Then you can eliminate, or focus on, your electrics.
+1

F.A.S.T - fuel, air, spark ,timing

I carry spark thread extenders for balancing the carbs, but they work great to check for spark also. The next time it dies, check for spark. If you have spark, then you have F.A.T remaining.