Start pinion -PIAGGIO- Vespa ET4 125 (ZAPM0400000001001), Aprilia Mojito 125 (ZD4PM), Piaggio Hexagon 125 (ZAPM15000), Piaggio Liberty 125 (ZAPM11000), Piaggio Sfera 125 (ZAPM01000)

The starter freewheel forms the connection between the starter engine and the crankshaft. The freewheel secures the components when the engine starts running and the engine speed exceeds the starter speed.

Crackling and cracking noises during the starting process often indicate a defect of this component. Inactivity can lead to a complete defect of the engine housing.
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