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Harley-Davidson SPARK PLUG REFERENCE
YEAR Model ENGINE ACCEL CHAMPION
1948-75 FL,FX Pan, Shovel (Standard plug) 2401 J12YC
1948-75 FL,FX Pan, shovel (hot plug) 2401A J18YC
1952-71 K,XL 900 Iron head sportster (std) 2402 H8
1952-71 K, XL 900 Iron Head Sportster hot plug 2402A H10
1975-79 FL,FX 1200 Shovel 2403A N12YC
1961-78 All 125-350 cc Italian HD singles 2407 N3C
1984 up FL,FX 1340 EVO 2410A RN12YC
1980-81 FL,FX 1340 Shovel 2410A RN12YC
1979-84 FL,FX 1200 Shovel (w/o Elec. Ign) 2403A RN12YC
1983-85 XR 1000 Ironhead 2412 N7YC
1979-85 XL 1000 Ironhead 2413 RL82YC
1982-84 FL,FX 1340 Shovel 2417 RN14LY
1986 up XLH 883,1100,1200 EVO 2418 RA8HC
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