Ngk recommend NGKBCPR7E with a gap of 1.0mm. Check www.aprilia-merseyside for further assistance.
40
the gap for a Harley plug on a 88c.i. is 30
The proper plug gap is 0.038-0.043 Mike
.040 in. RA8CH
.040, or 40 thousandths
The proper air gap is .032 to .036 depending on spark plug brand.
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"
.040 is rcommended gap .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.
Gap the plugs .038" to .043" and torque the plugs to 22 ft/lbs.