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An ignition coil on a moped works by converting the low-wave current from the battery or alternator into the high voltage needed to create a spark in the spark plug. This spark ignites the fuel-air mixture in the engine, which powers the moped. The ignition coil consists of a primary coil and a secondary coil that create a magnetic field when current passes through them. When the current is interrupted, the magnetic field collapses and generates a high voltage impulse that is sent to the spark plug to ignite the fuel. When does the ignition coil need to be replaced? The ignition coil may need to be replaced when the following symptoms occur: Starting problems: If the moped has difficulty starting, even though the battery is charged and everything else is working, the ignition coil may be defective. Irregular idle: A broken ignition coil can cause the moped to run rough, especially at low revs. Weak or no spark: If the spark plug does not produce a strong spark or no spark at all, it may be due to a faulty ignition coil. Reduced performance: If the moped loses power or does not reach its normal speed, this may indicate a problem with the ignition coil. Engine stall: If the moped suddenly stalls while driving and is difficult to restart, the ignition coil may be the culprit. Ignition coils are quite durable but can wear out over time due to heat, moisture or electrical problems. In the event of these symptoms, the ignition coil should be checked and possibly replaced to restore the moped to full function.