IF the crank is broken you can generally hear it when it runs. A clanking noise.
Remove the flywheel and see if the crank still moves.
Its possible the top brg has gone out.
There is nothing in the flywheel to come loose and cause problems as you have mentioned. By this I mean rubber grommets to spin out.
Ensure all the small bolts are tight too
Remove the flywheel and see if the crank still moves.
Its possible the top brg has gone out.
There is nothing in the flywheel to come loose and cause problems as you have mentioned. By this I mean rubber grommets to spin out.
Ensure all the small bolts are tight too