CHAMPION D14 Copper Plus spark plugs for Flatheads & Knuckles aftermarket alternative to OEM Harley davidson OEM #4

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CHAMPION J12YC Copper Plus spark plugs for Flatheads & Knuckles aftermarket
  • CHAMPION J12YC Copper Plus spark plugs for Flatheads & Knuckles aftermarket
  • CHAMPION D14 Copper Plus spark plugs for Flatheads & Knuckles aftermarket a

  • CHAMPION D14 Copper Plus spark plugs for Flatheads & Knuckles aftermarket alternative to OEM Harley davidson OEM #4

  • Copper Plus ( M18 X 1.5 X 7/16 ) Fits > 750(45")/1200(74")/1340(80") Side Valve (Flatheads); 36-47 Knucklehead (61-74") (OHV) models (NU) ** SOLD IN PAIRS**
  • £9.26

:  at  £9.26  each


BEST FOR HIGH COMPESSION MOTORS & LONG HIGH SPEED RUNNING

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.  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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