When changing the spark plugs on any vehicle, the person must leave the right gap size. The 1999 Harley Softail has a spark plug gap size of .040 inches.
.040"
.40
the gap for a Harley plug on a 88c.i. is 30
.040
.038" to .043"
.040 or 40 thousandths
.040
.037"-.043" using any spark plug gap gauge. I have a 93 heritage softail classic and that is what is recommended.
Use a dime to gap the plug. If u haven't got a dime use two nickles
The spark plug gap for a 1994 Harley-Davidson Softail Heritage is typically set at 0.040 inches (1.0 mm). It's always a good idea to check your owner's manual or service manual for the specific model to confirm this specification. Proper gap adjustment is crucial for optimal engine performance and efficiency.
The factory plug is HD PN 6R12- This is also available in the gold series plug. The factory plug is HD PN 6R12- This is also available in the gold series plug.
The spark plug gap for a 1999 H-D (Harley Davidson) is .032 to .036. The actual gap depends on the brand of spark plugs.