Is this Tractor worth spending time on?
Thanks in advance.
Have you taken out both spark plugs and then tried to whirl it over with the starter? (a badly flooded engine will spew out fuel, or water, or whatever out of the spark plug holes, if it was an hydraulic lock...this test can also catch a perfectly good engine on fire, if you don't ground out the high tension leads before whirling the engine over, so be very careful to do that, ground out the leads)
If you did remove both sparks, and the thing continues to lock, did you try manually turning the engine counter clockwise, to see if it will lock while turning in that direction? (turn it backwards at least 4 revolutions, do not force it manually or otherwise if you feel a heavy drag, as previously stated
from other replies on this thread)
Look for starter pinion gear damage, and also inspect the flywheel ring gear for a problem.
Make sure the clutch belt for the driveline & mower deck are disengaged
, and not the problem.
Check the engine oil, to see if there is any in it, and if so, is it overfull?
Does the oil from the dipstick smell/appear heavy laden with gasoline or water?