Just bought a 1987 Mariner 75 hp oil injected engine, serial # OB117717. Problem is it is only running on top cylinder , cleaned and checked carbs and floats. Is getting blue- white fire on all three cylinders. Has Quick-silver controls and the guy I bought it from just put a new key switch in it. Has 130 psi on 2 cylinders and 132 on other. Pumps water good, and can see fuel going in motor when it is running. Also noticed smoke coming from under front of hood and it is really smoking alot any help would be appreciated.
