Reply To: 1966 mercury 650?

[76-j]

One more thing, from personal experience. The female splines on end of the crankshaft, which mate with the driveshaft , are known to wear / rust away.
Buyer beware as you won’t know until you use the this outboard, or upon swapping lower units, observe the condition of spline(s).
*I recently Trashed a complete powerhead minus it’s carburetors, and fuel pumps.