On a 1976 Johnson 70hp outboard motor, water should come from the water intake located at the lower unit of the motor. This intake draws water in for cooling the engine while it operates. It's essential to ensure that the intake is clear of debris and that the water pump is functioning properly to prevent overheating. Regular maintenance, including checking the water pump and impeller, is crucial for optimal performance.
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 plug gap for a 70 Johnson would be .035 - .040.
The dry weight of a 1999 model, 70 hp Johnson outboard is 250 lbs.
110
The dry weight of a 1979 70hp Johnson outboard is 240 to 256lbs. depending on the model.
A 1979 70 HP Johnson burns about 3.5 GPH at 3/4ths WOT