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The correct spark plug gap for the 1994 model, 25 hp Evinrude outboard is .030 in.
most likely 50:1
.030
70 hp 1994 yamaha
.40
champion f12
0.25mm
One spark plug per cylinder. You didn't mention how many cylinders.
The correct ratio for a 5hp Mariner outboard would be 50:1, this is roughly one pint of 2 cycle oil, to six gallons of fuel.
Mariner
In order to check the stator on boat, you need to have a multimeter. First you have to make sure that the spark plugs are not misfiring. If they are replace them and then restart the battery.
j4j