40 to 45. 40 is common.
40
0.38
Get a manual. Handy.
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.
.040"
40
The recommended spark plug gap for a 1996 Harley Davidson 883 Sportster is .040. That is the most common gap for most Harley Davidson engines.
Stock Harley plugs works as good as any.
1.00 mm
.040
35
.040
.040".
The spark plug gap should be .040"