I have a 2013 Piaggio Typhoon 50cc 4t4v, should be simliar to the Vespa LX50 4t4v. But for the life of me I can't fine where the air filter sensor/solenoid valve "A at in the diagram below.
https://www.vespaforum.com/manuals/Vespa/LX50/LX50%204%20Stroke%204%20Valve/
thanks,