so i got this virago but needed alot of work. new solinoid, stater/alternator, relays,filters, spark plugs. so ive got these all replace and i just changed the needle valve assembly. i put the carbs back together and after i started it it turned off after a while and wont start up anymore. It pukes gas out of the exhaust pipes and just trys to start but doesnt. battery also new. can anyone shine some light on this????