lt80 fresh rebuild won't stay running?
 

i have a 92 lt80 rebiult top end (cylinder/piston),brand new carb,new reeds(stock),new petcock(yamaha warrior replacement,to bypass vaccum)and new starter . it will run for a couple of minutes then shut off and not restart?????????????. if i take the carb off and empty it it starts right away but then shuts off after a few minutes, kind of reminds me of a vapor lock. i also put clear fueline on to make sure it is getting fuel. I have another lt80 that i did the exact same setup on and the thing runs like a champ. So i'm stumped at this point? Any help would be greatly appreciated. thanks!