Tractor won't run for more than 2 minutes.?

Sounds to me, like, the float valve is blocked, stuck, or sticking, or, the float needs adjusting. Because, you get about 2 min. of run time, thats about what it takes to empty the bowl, and, without sufficient flow to refill it quickly enough, "its gonna die".Does it start right back up?, if so, its your float valve. If, its not a big hle, take the float off, to get to the float valve, clean any gunk off the plunger, make sure it moves freely in the seat, check for debris up in the intake orifice itself, spray some carb. cleaner up there, and shake, the float, to see if it has any leaks, but that would cause an overflow from the carb.,so nevermind.