Agree not the hub, the engine would race.
The newer OBs have overheat and low oil S.L.O.W. (Speed Limiting Overheat) sensors, that will not let the engine go over a certain RPM, I picked up a trash bag on the LU and the SLOW kicked in, saved the powerhead !!!
Check there is enough oil or that the sensor is OK if you got plenty of oil.
Good Luck
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