RMS Vespa Starter Motor (1984-Onwards) PX, CosaRMS Vespa Starter Motor (1984 Onwards) PX, Cosa The starter motor is fitted to all electric start Vespa P range models, and some Cosa models as well. The starter motor engages with the Starter ring gear which is connected to flywheel, which in turns starts the Scooter. The RMS starter motor is a fantastic reproduction part, and works just as well as the Genuine equivalent. electric start Aftermarket Comparison No. 249235 (PIAGGIO) 246390261 (RMS)