Well now Im itching my head. The housings for both motors appear identical, but the driveshafts are clearly different (Ill double check in the AM). The way I discovered this is the driveshaft socket special tool (to hold in place when removing the pinion nut) would fit on the ’92 gearcase, but not the ’00 johnson.

The johnson is a standard 50hp but I can pull the ID to double check. Didnt notice anything that lead me to believe it was a commercial model.

Doing a search on M.E. Showed different P/N’s for the two motors too, so I just moved onto a different motor from my inventory to fill the job.

On a side note, this other (3rd) motor I pulled from inventory is a ’95 50hp, and the impeller was totally blown up. I stopped my workday before going any further and am concerned bits of the impeller may be sucked up into the powerhead water passages. I snaked a spy camera up the exhaust housing water passage and didnt see anything, but stopped at the bottom of the powerhead in fear of getting the camera stuck.

I pulled apart a ’92 50hp yesterday (blown crank case/melted rod) and when I pulled the exhaust bypass cover and cylinder head, I didnt see many (if any at all) small water passages in this motor, perhaps just the actual cylinder head orifices behind the head gasket.

Are these motors fairly ‘forgiving’ in terms of allowing perhaps debris the size of the tip of your pinky to pass through without clogs?