Copper Plus™ Spark Plug — 14 mm thread, 11.1 mm reach (7/16"), 17.5 mm hex (11/16"), heat range 8

CHAMPION Copper Plus™ Spark Plug — 14 mm thread, 11.1 mm reach (7/16"), 17.5 mm hex (11/16"), heat range 8 – 58-78 Sportster

CHAMPION
RH8C
CCH538
Copper Plus™ spark plug with copper-core electrode, SAC-9 resistor and Ultraseal™ coated shell; made in the USA.
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The Copper Plus™ spark plug pairs a copper-core center electrode with modern resistor technology to deliver reliable ignition, improved heat control, and extended service life. ⚡️🔧

  • Copper-core center electrode for accurate heat range control and optimized performance.
  • Patented SAC-9 semiconductor resistor for maximum EMI and RFI suppression, delivering stable ignition.
  • Patented Ultraseal™ coated shell to prevent rust and corrosion for longer durability.
  • Made in the USA.

Ideal for engines that require consistent spark timing and dependable operation between services.

: RH8C
In Stock

Data sheet

Type
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
8
Terminal Configuration
Removable Nut
Center Electrode Projection
Non-Projected
Hex Size
17.5 mm (11/16")
Thread Reach
11.1 mm (7/16")
Harley Family
Sportster

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

Manufacturer Model Family Year Notes
Harley Davidson Sportster Sportster 1972
Harley Davidson Sportster Sportster 1973
Harley Davidson Sportster Sportster 1974
Harley Davidson Sportster Sportster 1975
Harley Davidson Sportster Sportster 1976
Harley Davidson Sportster Sportster 1977
Harley Davidson Sportster Sportster 1978
Harley Davidson Sportster Sportster 1958
Harley Davidson Sportster Sportster 1959
Harley Davidson Sportster Sportster 1960
Harley Davidson Sportster Sportster 1961
Harley Davidson Sportster Sportster 1962
Harley Davidson Sportster Sportster 1963
Harley Davidson Sportster Sportster 1964
Harley Davidson Sportster Sportster 1965
Harley Davidson Sportster Sportster 1966
Harley Davidson Sportster Sportster 1967
Harley Davidson Sportster Sportster 1968
Harley Davidson Sportster Sportster 1969
Harley Davidson Sportster Sportster 1970
Harley Davidson Sportster Sportster 1971
Harley Davidson Sportster Sportster 1972
Harley Davidson Cafe Racer Sportster 1977
Harley Davidson Cafe Racer Sportster 1978
Harley Davidson Sportster Sportster 1972
Harley Davidson Sportster Sportster 1973
Harley Davidson Sportster Sportster 1974
Harley Davidson Sportster Sportster 1975
Harley Davidson Sportster Sportster 1976
Harley Davidson Sportster Sportster 1977
Harley Davidson Sportster Sportster 1978
Harley Davidson Sportster Sportster 1958
Harley Davidson Sportster Sportster 1959
Harley Davidson Sportster Sportster 1960
Harley Davidson Sportster Sportster 1961
Harley Davidson Sportster Sportster 1962
Harley Davidson Sportster Sportster 1963
Harley Davidson Sportster Sportster 1964
Harley Davidson Sportster Sportster 1965
Harley Davidson Sportster Sportster 1966
Harley Davidson Sportster Sportster 1967
Harley Davidson Sportster Sportster 1968
Harley Davidson Sportster Sportster 1969
Harley Davidson Sportster Sportster 1970
Harley Davidson Sportster Sportster 1971
Harley Davidson Sportster Sportster 1977
Harley Davidson Sportster Sportster 1978