hi all i have purchased a vivacity as a run around just doing it up atm before i put it on the road got it running using a booster as no batter and rode it up and down the my works yard for about 5 mins then all of a sudden it wouldnt rev i had a look at the rollers and they were bollocksed and had some new one which i fitted but still have the same problem where it wont rev and have since put a battery in it i have plenty of fuel and oil in it anybody have any ideas?
could be reeds or the fuel line could be blocked or could even be the jets are blocked just a few things iv seen in the past lol might not fix your problem but worth a look into