Practice question

What is the main function of piston rings in a motorcycle engine?

  1. Replace the connecting rod small-end bearing entirely
  2. Generate the high-tension spark at the plug
  3. Act as the primary frame of the motorcycle
  4. Seal combustion pressure, control oil on the cylinder wall and transfer heat to the cylinder

Answer: D — Seal combustion pressure, control oil on the cylinder wall and transfer heat to the cylinder

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