fits  750 (45″)/1200 (74″)/1340 (80″) Side Valve (Flatheads); 36-47 Knucklehead (61/74″) (OHV) models (NU)

H-D #3, standard heat range. M18 X 1.5 threaded. 1/2″ (12.7mm) short reach. Used with a 24mm spark plug socket. This D16 (H-D #3) is the standard recommended spark plug for regular riding. For extensive high speed riding, like extended highway use, a range colder spark plug is available as Champion D14 (H-D #4) (MCS 931601). Spark plug has a copper-core center electrode and is equipped with the patented Ultraseal coated shell, to help keep the spark plug corrosion free for a longer period of time.

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