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A1Difficulty 3/5

On a motorcycle with a self-contained magneto ignition system, where does the electrical energy needed to produce the spark come from?

Correct answer

From the engine-driven magneto.

The engine-driven magneto generates it, so this ignition system does not depend on the battery to produce the spark. This does not mean every motorcycle with a magneto has no battery: other equipment may use one. If a battery is fitted, maintain it according to its type and the manufacturer’s instructions; adding acid or routinely replacing electrolyte is not a normal maintenance operation.

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All options

  • Always from a separate battery, because the magneto does not generate electricity.

  • From the engine-driven magneto.

  • From oil pressure, without electrical generation.

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