Ignition coil for Viper 125-200 cc motorcycles and similar (China, Minsk). The ignition coil converts the system's low voltage into the high voltage that produces the spark at the spark plug. Without a spark the engine does not run.
Signs of a fault: a weak or disappearing spark, misfires, poor starting, especially on a hot engine. The coil is checked by the resistance of its windings; while you are at it, inspect the spark plug cap and the wires.
