HP Motor Requirements
I ran all around New England waters for 5 years pushing my Columbia 22 with a 1.2 HP British Seagull. She was a heavy barge as I lived aboard, year round and carried all of the things I needed to make it do-able. I got 3 1/2 knots average out of her. Yes, without a doubt you can push your Kells around with a 2 HP but don''t expect her to come out of the hole like a dragster. You''re not going to hurt it any, it''s only going to push just a certain amount and that''s it. Planning is the key to working around with low HP. As for the big motor, it sounds like the prop has let go from its bushing, in which case, you may need a new prop. Or if it has one, the shear pin has let go.