Practice question

What is the function of the resistor (typically 5,000 ohms) built into standard motorcycle spark plug caps?

  1. To suppress electromagnetic interference (RFI/EMI) generated by the high-voltage spark that could disrupt electronic CDI or speedometer functions.
  2. To reduce the voltage of the spark to prevent damage to the piston crown.
  3. To increase the temperature of the spark plug electrode for better combustion.
  4. To act as a fuse that melts if the ignition system becomes too hot.

Answer: A — To suppress electromagnetic interference (RFI/EMI) generated by the high-voltage spark that could disrupt electronic CDI or speedometer functions.

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