set you gap at .031
ST 4 Cyl.1.8L - Gap 0.032
The correct spark plug gap for the 1982 model, 9.8 hp Mercury outboard is .040 in.
gap is .035
What is the spark plug for a 1982 Shovle head
The plug gap should be .035 inch.
It is .044
.045
.7 - .8
.24 to .31
0.7mm
ngk bpr7es .030 gap