Maybe it's muffler bearings?
Need more info concerning the problem. You getting 12 volts out the coil during start. These trucks are pretty basic and the 3 things, Fuel, Electric, or mechanical are the things to eliminate.
What I would like to know is where are the wires (3 wire starter wires) going to when they leave the starter. Check Dizzy wiring also.
starter.jpg
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