The spark plug gap for a 2005 Harley-Davidson Fat Boy is typically set at 0.040 inches (1.0 mm). It's essential to check the owner's manual or service manual for your specific model, as there can be variations depending on the engine and any modifications. Always ensure the spark plugs are properly gapped before installation for optimal engine performance.
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"
.038to.043
The spark plug gap should be .040"
40
the gap for a Harley plug on a 88c.i. is 30
.040
35
1.00 mm
.040
.040".
.037" to .043",