The difference between two magnetos should not exceed more than?

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Multiple Choice

The difference between two magnetos should not exceed more than?

Explanation:
Magnetos must fire in near-synchronism so each cylinder gets spark in very close timing. The limit of 50 rpm means that when you test the two magnetos at a specified engine speed, the readings should not differ by more than 50 revolutions per minute. A larger difference signals wear or timing drift in one magneto relative to the other, which can cause uneven ignition timing, rough running, or misfiring, especially at higher power. Smaller limits like 25 rpm are too strict for normal tolerances, while 75 or 100 rpm would allow a noticeable imbalance.

Magnetos must fire in near-synchronism so each cylinder gets spark in very close timing. The limit of 50 rpm means that when you test the two magnetos at a specified engine speed, the readings should not differ by more than 50 revolutions per minute. A larger difference signals wear or timing drift in one magneto relative to the other, which can cause uneven ignition timing, rough running, or misfiring, especially at higher power. Smaller limits like 25 rpm are too strict for normal tolerances, while 75 or 100 rpm would allow a noticeable imbalance.

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