i bought a dellorto shbc 19 19 carb the main jet in it is a 73! when everything is put in the scooter idels well as soon as i drive it starts to jump on me so then i pull the air and it runs better! my question is what sized jet could i use to replace the one thats in it right now so that my vespa runs better??
also the vespa is kitted with a 70cc kit!