30 thousands of an inch
Johnson 6hp spark plug gap
The 25 hp Johnson outboard runs a plug gap of .030 in.
The plug gap for a 1995 model, 85 hp Suzuki outboard is .039 in.
The 1955 model, 3 hp Johnson outboard, requires a spark plug gap of .030 in.
The spark plugs on a 1988 model, 70hp Johnson outboard, should be gapped to .030in.
1984 Johnson 6 HP
The recommended plug gap for the 1972 model, 20 hp Johnson outboard is .030 in.
The correct spark plug gap for the 1979 model, 100 hp Johnson outboard is .030 in.
.030
.030
The plug gap for a 70 Johnson would be .035 - .040.