Install a short clear hose from the carburetor to a container of fuel. This illuminates the fuel system and tells you that the carbs are able to pump fuel
Not a carbon seal set up
there is a needle bearing and a seal there
bearing likely frozen to shaft
when that happens it tears up the tube the driveshaft runs thru
they have a repair kit for this
comes with a part to glue/ drive into the tube
Check the grounds under the coil mounting bolt in the rear box
disconect the white wire from the coil and connect it to a grounded test light, crank the motor.
if the test light ‘flickers’ every thing back from there is good
if not test stator