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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Home > Parts > Electrical > Ignition > Spark Plugs > Champion, Copper Plus spark plug. D16

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

H-D #4, one range colder. M18 X 1.5 threaded. 1/2″ (12.7mm) short reach. Used with 24mm spark plug socket. This D14 (H-D #4) is one range colder (runs less hot/removes heat faster) than the standard D16 (H-D #3) spark plug. This D16 is available as MCS 931600. The cooler running proporties make this D14 is better suited for high speed riding, as found in extended highway use. Spark plug is copper-core center electrode and comes with the patented Ultraseal coated shell, to help keep the spark plug corrosion free for a longer period of time.

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Home > Parts > Electrical > Ignition > Spark Plugs > Champion, Copper Plus spark plug. D14