"Fred, called for Leaded gas b
"Fred, called for Leaded gas because the other option at the time was "white marine gas". You can run unleaded but you may want to change the fuel lines on the motor for 2 reasons. First, after sitting this long they may have dry rotted - secondly, the ethanol in the fuel now eats the old rubber which was not designed to handle it.
And yes, during the break in you run "more" oil to allow all the parts to settle in properly. So follow your instructions. Use regular two cycle motor oil (such as used for lawnmowers/chainsaws) NOT marine rated TCW-3 (or any of the TCW's) which are designed to burn up at lower temps in water cooled motors....
Brian, it may seem confusing because Sea King was built by a number of different companies over the years - so depending on the actual mfg and year it was built, plus whether it was air-cooled or water-cooled will affect what oil you run and at what ratio.
Post you model number and can give you answer..."
A "professional" is someone who gets paid for their work - it doesn't necessarily mean they are good at it :)