I bought a Johnson 6hp seahorse off a freind,it was just laying on the floor in the corner of his garage w/junk piled on it.Didnt get a manual or any information on it. Model # CD-22M , Serial # J 2526682, I think it's a 1965 but not sure, can anyone tell me if I'm right on the year an need to know the fuel mix and spark plug gap. Thanks for your help.