Description
Champion J12YC Copper cored Spark Plugs x 1 Pair to fit Harley-Davidson 1948 to 1974
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: 1948-1974 B.T.
Part Number 931606
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