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.040 or 40 thousandths
.040
Use a dime to gap the plug. If u haven't got a dime use two nickles
.037"-.043" using any spark plug gap gauge. I have a 93 heritage softail classic and that is what is recommended.
the gap for a Harley plug on a 88c.i. is 30
.038" to .043"
Twin Cams take a 12mm thread diameter plug. All Harleys with electronic ignition require a .040 plug gap.
.038to.043
.040"
When changing the spark plugs of a vehicle a person has to gap the plugs at the right size. The spark plug gap for a 2003 Heritage Softail is .036 inches.Ê
.40
.40