The spark plug gap for a 2004 Harley Davidson Fat Boy is typically set at 0.040 inches (1.0 mm). It's important to check the specific recommendations in the owner's manual or service manual, as variations may exist based on the engine configuration or modifications. Always ensure the gap is properly adjusted before installation for optimal engine performance.
Saw online the gap is .040
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 spark plug gap should be .040"
the gap for a Harley plug on a 88c.i. is 30
.040
35
1.00 mm
.040
.040".
.037" to .043",