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1973 Johnson 25hp acting like prop hub spun...

hystat

Outstanding Contributor
but it hasn't spun. I tried several props. It does it the worst with the 12P. almost held on plane with a 10P, but then slipped.

If the dogs in the lower were gone, I would expect clunking. But this feels exactly like a spun prop hub.
Holds torque until just about to plane then revs up.

Spline somewhere slipping?

not a ventilation issue- I have my identical 1975 25HP on the boat now. I put the same props on it - no problem on it.
 
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