The kick starter gear is the counterpart to the kickstart pinion and sits on the crankshaft in front of the variator. The teeth wear out over time, which leads to problems with the kick starter. Should this happen, it should be replaced immediately. Kick starter gear OEM 34.5x17 for Aprilia, Gilera, Piaggio, Vespa. Piaggio original spare part. For comparison purposes OEM numbers: 235060 - 435060 - 478032