Book says 16:1 if your motor is ’69, 24:1 if it’s ’70-‘ 73, 32:1, if ’74 on if the oil is certified TC-W, otherwise stay with 24:1.
Takes Champion J13Y gapped at .030.
Eskas were made for 25 years, starting in 1960. Most early models used an air cooled Tecumseh powerhead, so I am guessing it would use a Champion 529 spark plug (or equivalent) and a quarter of a pint of chainsaw oil per gallon of gas. If I am wrong, you may rest assured, I will quickly be corrected . . . . 😀