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The picture is taken from here. Are there any electronics in this 49cc 2 stroke dirt bike engine. Are electronics responsible for the ignition timing of spark plug? Or, is the flywheel (that has magnet on one side) help in the ignition timing of spark plug? And, is the oil injection timed as well in this engine and how it is timed perfectly? I need some help in understanding this.

  • @RoryAlsop I have reworded the question for the OP. There is surely no need to close a question just because a presumption was made. I am sure there are plenty of other questions where the OP presumed something was the case and were corrected in an answer.
    – HandyHowie
    Feb 23, 2022 at 7:49
  • When you asked about the oil injection, did you mean fuel?
    – HandyHowie
    Feb 23, 2022 at 7:50
  • @HandyHowie that's a good edit. Upvoted and retracted close vote.
    – Rory Alsop
    Feb 24, 2022 at 7:38

1 Answer 1


There are no electronics used on this engine. The spark is produced and timed by the magnet passing the HT coil. The output of the HT coil goes directly to the spark plug.

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  • The electronics in the black casing shown in your picture actually. But, I have no idea why we need that. And, what about the fuel injection timing ? Are there any :)
    – Testing Su
    Feb 22, 2022 at 15:14
  • Got a smilar video here at youtube.com/… . At 2:43 in that video, it shows he is taking off the electronics :)
    – Testing Su
    Feb 22, 2022 at 15:23
  • 2
    The black casing in that picture is just an HT coil. No electronics.
    – HandyHowie
    Feb 22, 2022 at 16:09
  • 1
    Same in the second video, just an HT coil and spark plug cable and an extra wire for killing the spark.
    – HandyHowie
    Feb 22, 2022 at 16:10
  • There may be a language issue here. To be clear: the devices shown in the video (HT coil, spark plug cables) are electrical but they are not electronic. The two words do not have the same meaning. Feb 23, 2022 at 0:35

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