Re: info on 40 hp Sea King
You can run that at 50:1 with any decent outboard oil. 24:1 was the norm back in the olden days when all that was available was regular motor oil. Parts are available thru a Johnson/Evinrude dealer. They have many common parts with their more mainstream cousins.<br /><br />Sparkplug Champion J4C if you run at 50:1, J6C if 24:1 to reduce fouling. Points gap .020, plug gap .030. Most any gearlube will suffice for the lower unit. Use regular unleaded gas, avoid alcohol. Your motor probably doesn't have a charging system for the battery, so you'll have to charge it with a charger on occasion.