H-D 5R6A. 14mm threaded, long reach. Used with a 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented Ultraseal™ coated shell, to help keep the spark plug body corrosion free and better looking for a longer period of time.
Fits: > L78-E82 FL; L78-79 FX; 84-99 B.T.(excl. TC); 75-E78 FL, FX (NU)
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Repl. for OEM 6R10 / RG6HCC. 10mm threaded. 19mm (3/4") reach. 4 used on M8, 2 used on XG. Used with a 16mm spark plug socket. NGK copper core V-Power spark plugs feature a specially designed v-groove center electrode, improving ignitability and reducing quenching. The 98% pure copper core delivers increased heat dissipation for more reliable starts and reduced risk of overheating. - Cold-rolled threads prevent cross-threading and damage to cylinder heads. - Trivalent plating eliminates need for anti-seize. - High-grade alumina silicate ceramic.
Fits: > 17-22 M8; 15-20(NU)Street XG750/500; 17-20(NU)XG750A
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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.
Fits: > 750(45")/1200(74")/1340(80") Side Valve (Flatheads); 36-47 Knucklehead (61/74") (OHV) models (NU)
H-D RA6HC (10R12X). 12mm threaded. Requires 16mm spark plug wrench socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented Ultraseal™ coated shell, to help keep the spark plug body corrosion free and better looking for a longer period of time. Custom replacement for OEM 27794-08.
Fits: > 08-12 XR1200; 08-10 Buell XB (NU)
H-D 3-4. 14mm threaded, 1/2" (12.7mm) short reach. Used with 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented Ultraseal™ coated shell, to help keep the spark plug body corrosion free and better looking for a longer period of time.
Fits: > 48-74 B.T. (NU) pr.stk
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.
Fits: 36-47 KNUCKLE. 37-48 B.T. SV.
H-D #4R. 14mm threaded. 12.7mm (1/2") short reach. Used with a 21mm spark plug socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented Ultraseal™ coated shell, to help keep the spark plug body corrosion free and better looking for a longer period of time. Custom replacement for OEM 32301-80.
Fits: > 79-85 XL (NU) Selges Pr stk
Repl. for OEM 6R10 / RG6HCC. 10mm threaded. 19mm (3/4") reach. 4 used on M8, 2 used on XG. Used with a 16mm spark plug socket. The NGK Iridium IX spark plugs offer improved throttle response, superior anti-fouling and high-ignitability, which makes Iridium IX® ideal for the performance enthusiast, even better than platinum. Iridium's extremely high melting point is perfectly suited to today's high-temperature engines, delivering outstanding acceleration, fuel efficiency and double to triple the lifespan of a copper core plug. - Fine iridium tip ensures high durability and a consistently stable spark. - Trivalent metal plating for superior anti-corrosion and anti-seizing properties. - Outstanding acceleration, high fuel efficiency and durability.
Fits: > 17-22 M8 models; 15-20(NU)XG500/750/750A; 08-10 Buell 1124R; 09-10 1124CR Cafe Racer
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