Can't go over 2500 rpm's?

[tsubaki]

MJ, being that thing is leaking water in those locations, it more than likely has corroded the spline locations at the lower bearing of the crankshaft and the shaft to the foot. It was probably caused (by the last owner) from improper alignment of the waterpump tube or it has rotted a hole in it.
I've fooled with one motor that was sunk for a period of time and it was a real SOB to remove.
The wedges and bumping of the propeller engauged over a period of days finally released it.
Sorry you went black.