.038 to .042 depends on spark plug brand.
.040"
hello...where is the oil plug located on a 2002 Harley Road King Classic? *this bike is new to me...
The suggested spark plug gap for a 1973 Harley Davidson is 0.040. It is the suggested gap for most of the spark plugs of that era.
40 to 45. 40 is common.
The correct spark plug gap is 40 thousands on a stock harley plug
the gap for a Harley plug on a 88c.i. is 30
The spark plug gap should be .040"
.04
.040"
Twin Cams take a 12mm thread diameter plug. All Harleys with electronic ignition require a .040 plug gap.
I had this problem on my 2004. I realized the front spark plug wire was loose. Probably pulled out when cleaning.
.40