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1974 70hp Johnson
For a comprehensive answer to this go to marinedoctor.com Ther is a section dealing with this specif question on a 70 hp johnson.
The spark plugs on a 1988 model, 70hp Johnson outboard, should be gapped to .030in.
my Johnson seahorse 70hp runs pretty nice at 50:1 fuel to oil ratio (1 litre oil to 50 litres fuel)
.030
240 inch pound
50:1
The dry weight of a 1999 model, 70 hp Johnson outboard is 250 lbs.
The plug gap for a 70 Johnson would be .035 - .040.
The dry weight of a 1979 70hp Johnson outboard is 240 to 256lbs. depending on the model.
110
A 1979 70 HP Johnson burns about 3.5 GPH at 3/4ths WOT