I have a 65' Vespa with a 150CC, I have been having serious engine trouble, several times a month. A guy over at the shop said I should consider a new Lambretta or Stella engine, thoughts? Problems range from locking up at speeds over 40mph (specifically when traveling at this speed for more then a minute), sputtering at any speed (when it gets warm), to just straight out shutting off. Being that I ride the bike in Manhattan and over bridges, it gets scary.
Any thoughts? Thanks