You may use any quality TCW3 rated, 2 cycle oil.
I have the same motor bought it new 1975. I use Quicksilver Merc. 2cycle oil. 16oz. per 6 Gals. gas.
32/1
32 to1
A: The gas/oil mixture Harley-Davidson recommends is 85 to 1 or 1.5 ounces per gallon. Keep in mind, this recommendation is for the specially formulated, highly refined oil they originally produced - not outboard oil! This oil is (part# 99802-92)
yesw 16 to 1
40/1
Mix it 50:1. That's a pint of two cycle oil per 6 gallons of gas.
One of the little things of oil with a full tank of gas..1.5 g
Most use a 15% alcohol to 85% gasoline mixture.
1 qt to 12 gallon of fuel
32:1 is a good ratio.