I have a Chrysler 44HD 4.9hp 1975 motor, serialn. 11971. It was bought without knowing anything about it so we did a overhaul checking if everything was ok, bought some part and put it back together. No the motor is running but it lacks power. We think it might be because we have the wrong spark plug or the fuel mix is wrong. Does anyone know what type of spark plug we should use and if we are using the right fuel mix 50:1?
