1654 with a backplate and 60hp johnson that has a14x17 prop only doing 28 mph with two people is that normal? I believe the motor is a 20inch shaft with 13 splines. 95% of the time it's two people with an ice chest in the boat.
Changed gas tank. 6 gallons of fuel to 16oz of oil. Starts and idles but will not get on step. Bogs down trying to give full throttle! Primer bulb? Confused at this point!