I just got an old 20hp Merc that has been sittiong in my brother's shed for the last 5-7 years. It ran perfectly when put in there. This motor is a conglomeration of 2-3 dead motors (I know PH and LU came from different motors) to make one good one. My dad, who put it together years ago, believes all parts came from 68-72 models. I'm assuming at minimum it needs a carb kit, fluid change, and water pump rebuild. It also looks like some mice made a home in it. The motor isn't locked and seems to be in good condition overall. Am I missing anything in the prep to get it going? Wher do you find serial nos or model/year info on Mercs so I can be sure to get the right parts?
