[baird4444]

you say a couple of nuts from the alternator...
      is it possible the stator coils have jammed against the center?
      Try removing the existing nut and swing the coil up and rest it on the
      case....    are you still locked up? 
     it may not be this simple but never over look the obvious...
                - Mike

[drewmann]

Hi ,mine did same thing and was key in rotor shaft had sheared off and locked up on stator ,nut holding rotor on had snaped off as well ...good luck !

[neil]

Hi Mr. Gently:

If you have failed sprag gears, you won't be able to see them until you remove the inner primary case and remove the small metal pocket on the rear that holds them. You may have to gently turn the partially exposed drive gear in order to pull the engine sprocket prior to removing the inner primary cover. Then you will be able to tell if it's sprag gears or engine failure.  My sprags failed the way you are describing. Everything locked up and I had to tear down the primary before I could make the determination. When I was satisfied the sprags had failed again, I went for the kick only solution.

Neil

ps. If you go kick only, dump the lumb on the inner primary and get the correct inner primary. It'll make your life much easier for down pipe and muffler changes.