Makes me wonder if it is related to the 12V wire running to the coil in the start position. Maybe try getting it warm to where it is having the problem, then "hot wire the coil", run a wire from the + side of the battery to the + side of the coil and see if it starts. If it does, then it will be a break in the 12V start wire. It may be that it has a connection at the starter motor and has just fallen off or broken.
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