hey bobpaul and bubbakat a friend of mine has a 50 hp merc. setting on the boat with muffs on it will idle and rev up just fine. but as soon as you get it on the water and try to throtle it it bogs down. now not sure year of the motor. but i think its a pretty old one. the distributer turns when you throttle it. it has 2 carbs. i looked for modle # but it wasnt on the shaft like its supposed to be. all i could find to identify it was 50 four on the cowl. he says when on the water sometimes if he turns the wheel left and right while going down the river it will straighten up. im not sure thats why im asking you all. but it sounds to me by making the boat rock like that helping it some could be one or both floats. all thoughts would be appr.