.04
.040
.040".
HD 6R12
The gap setting is 0.034 to 0.037.
Saw online the gap is .040
35 on the gap gauge
with a left-handed spark plug wench...hehe, then you gotta putt'em in with a right-handed spark plug wench
40 to 45. 40 is common.
Available at your Local Harley Dealer.
40 to 45. 40 is common.
The proper plug gap is 0.038-0.043 Mike