Practice question

In a four-stroke spark-ignition motorcycle engine, which stroke draws the fresh air–fuel mixture into the cylinder?

  1. Exhaust stroke only with both valves closed tightly
  2. Power stroke after the mixture has already burned
  3. Intake (suction) stroke with the intake valve open and piston moving down
  4. Compression stroke with the intake valve held wide open intentionally

Answer: C — Intake (suction) stroke with the intake valve open and piston moving down

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