Re: Johnson 25hp identification
Those eighties twins were strong reliable motors, same block used up to todays outboards, close to same ignition too. Clean and rebuild the carb, Clean all electrical connectors, including ground connections. Change water pump impeller and gear oil, observing if the old is milky from water intrusion. Change spark plugs to new Champion QL77JC4. All chances are you got a good motor. ( And a good friend )