guy shows up with a nice manco streaker,prob is as follows... bike starts but shuts down guickly,please use pics as note. carb has a strange piece of plastic in it,i say it should'nt be there. needs return spring,not wire. ?????does that plastic piece belong in carb,i saw a minkuni with a flat in it just like it,is it some kind of flap??? please help,thank you in advance.