Copper Plus™ Spark Plug — 14 mm thread, 9.5 mm reach (3/8"), heat range 12

CHAMPION Copper Plus™ Spark Plug — 14 mm thread, 9.5 mm reach (3/8"), heat range 12 – 48-74 Big Twin

CHAMPION
J12YC
CCH10

Copper Plus™ spark plug with a copper-core center electrode and Ultraseal™ coating for improved ignition and corrosion resistance.

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The Copper Plus™ spark plug features a copper-core center electrode for precise heat control, optimizing performance and longevity. ⚡️

  • Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression
  • Patented Ultraseal™ coated shell prevents rust
  • Made in the USA 🇺🇸

Engineered for reliable ignition and consistent starts across a wide range of applications.

: J12YC
In Stock

Data sheet

Type
Non-Resistor
Units
Each
Style
Copper Plus
Brand
CHAMPION
Thread Size
14 mm
Center Electrode Type
Standard
Electrode Tip Material
Nickel Alloy
Ground Electrode Shape
Standard
Ground Electrode Configuration
Single
Heat Range
12
Terminal Configuration
Solid Terminal
Center Electrode Projection
Projected
Hex Size
20.6 mm (13/16")
Thread Reach
9,5 mm (3/8")
Harley Family
Vintage Big Twin

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Big Twin 1948
Harley Davidson Hydra Glide Big Twin 1949
Harley Davidson Hydra Glide Big Twin 1950
Harley Davidson Hydra Glide Big Twin 1951
Harley Davidson Hydra Glide Big Twin 1952
Harley Davidson Big Twin 1948
Harley Davidson Hydra Glide Big Twin 1949
Harley Davidson Hydra Glide Big Twin 1950
Harley Davidson Hydra Glide Big Twin 1951
Harley Davidson Hydra Glide Big Twin 1952
Harley Davidson Big Twin 1948
Harley Davidson Hydra Glide Big Twin 1949
Harley Davidson Hydra Glide Big Twin 1950
Harley Davidson Hydra Glide Big Twin 1951
Harley Davidson Hydra Glide Big Twin 1952
Harley Davidson Big Twin 1948
Harley Davidson Hydra Glide Big Twin 1949
Harley Davidson Hydra Glide Big Twin 1950
Harley Davidson Hydra Glide Big Twin 1951
Harley Davidson Hydra Glide Big Twin 1952
Harley Davidson Hydra Glide Big Twin 1953
Harley Davidson Hydra Glide Big Twin 1954
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1957
Harley Davidson Duo Glide Big Twin 1958
Harley Davidson Duo Glide Big Twin 1959
Harley Davidson Duo Glide Big Twin 1960
Harley Davidson Duo Glide Big Twin 1961
Harley Davidson Duo Glide Big Twin 1962
Harley Davidson Duo Glide Big Twin 1963
Harley Davidson Duo Glide Big Twin 1964
Harley Davidson Electra Glide Big Twin 1970
Harley Davidson Electra Glide Big Twin 1971
Harley Davidson Electra Glide Big Twin 1972
Harley Davidson Electra Glide Big Twin 1973
Harley Davidson Electra Glide Big Twin 1974
Harley Davidson Electra Glide Big Twin 1965
Harley Davidson Electra Glide Big Twin 1966
Harley Davidson Electra Glide Big Twin 1967
Harley Davidson Electra Glide Big Twin 1968
Harley Davidson Electra Glide Big Twin 1969
Harley Davidson Hydra Glide Big Twin 1953
Harley Davidson Hydra Glide Big Twin 1954
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1953
Harley Davidson Hydra Glide Big Twin 1954
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1952
Harley Davidson Hydra Glide Big Twin 1953
Harley Davidson Hydra Glide Big Twin 1954
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1957
Harley Davidson Duo Glide Big Twin 1958
Harley Davidson Duo Glide Big Twin 1959
Harley Davidson Duo Glide Big Twin 1960
Harley Davidson Duo Glide Big Twin 1961
Harley Davidson Duo Glide Big Twin 1962
Harley Davidson Duo Glide Big Twin 1963
Harley Davidson Duo Glide Big Twin 1964
Harley Davidson Electra Glide Big Twin 1965
Harley Davidson Electra Glide Big Twin 1966
Harley Davidson Electra Glide Big Twin 1967
Harley Davidson Electra Glide Big Twin 1968
Harley Davidson Electra Glide Big Twin 1969
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1957
Harley Davidson Duo Glide Big Twin 1958
Harley Davidson Duo Glide Big Twin 1959
Harley Davidson Duo Glide Big Twin 1960
Harley Davidson Duo Glide Big Twin 1961
Harley Davidson Duo Glide Big Twin 1962
Harley Davidson Duo Glide Big Twin 1963
Harley Davidson Duo Glide Big Twin 1964
Harley Davidson Electra Glide Big Twin 1970
Harley Davidson Electra Glide Big Twin 1971
Harley Davidson Electra Glide Big Twin 1972
Harley Davidson Electra Glide Big Twin 1973
Harley Davidson Electra Glide Big Twin 1974
Harley Davidson Electra Glide Big Twin 1965
Harley Davidson Electra Glide Big Twin 1966
Harley Davidson Electra Glide Big Twin 1967
Harley Davidson Electra Glide Big Twin 1968
Harley Davidson Electra Glide Big Twin 1969
Harley Davidson Hydra Glide Big Twin 1955
Harley Davidson Hydra Glide Big Twin 1956
Harley Davidson Hydra Glide Big Twin 1957
Harley Davidson Duo Glide Big Twin 1958
Harley Davidson Duo Glide Big Twin 1959
Harley Davidson Duo Glide Big Twin 1960
Harley Davidson Duo Glide Big Twin 1961
Harley Davidson Duo Glide Big Twin 1962
Harley Davidson Duo Glide Big Twin 1963
Harley Davidson Duo Glide Big Twin 1964
Harley Davidson Electra Glide Big Twin 1965
Harley Davidson Electra Glide Big Twin 1966
Harley Davidson Electra Glide Big Twin 1967
Harley Davidson Electra Glide Big Twin 1968
Harley Davidson Electra Glide Big Twin 1969
Harley Davidson Super Glide Big Twin 1971
Harley Davidson Super Glide Big Twin 1972
Harley Davidson Super Glide Big Twin 1973
Harley Davidson Super Glide Big Twin 1974
Harley Davidson Super Glide Big Twin 1974