The service manual says(0.024~0.028 in) Type-D8EA (NGK)
.032
What is the spark plug gap setting for a 1987 yamaha big bear
.7 - .8 mm
The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs.
.045
0.035
11/16inch or 18mm socket.
.060
.035
.035
The proper plug gap is .035" or thirty five thousandths.
.35