15 hp evinrude 1976

my outboard runs fine at slow

my outboard runs fine at slow speeds but when I rev it up the prop does not keep up with the engine. Whats the problem?

A slipping hub within the prop

A slipping hub within the propeller. Have the prop rehubbed.

Thanks Joe I'll pull the p

Thanks Joe I'll pull the prop off instead of the whole motor

"I entered that reply assuming

"I entered that reply assuming that the engine had run properly on the same boat in the past.

You can check for a slipping hub by blocking the propeller with a piece of wood, put the engine into gear, then apply torque to the flywheel nut with a long breaker bar and socket.

If you can turn the flywheel and have the propshaft turn within the propeller, the propeller requires rehubbing.

If this engine/boat combination is new to you, the engine may be mounted too high on the transom (cavitation), or the splines of the driveshaft may be worn and not engaging properly.

Let us know what you find."

Joe I wanted you to know the h

Joe I wanted you to know the hub on the prop was almost completely worn. The new prop is amazing I had no idea the but would run so well. thanks again for the help