Stalling

#1
I have an old flathead (probably 20yrs old) 3 hp briggs and stratton engine and it runs fine for the first like 5-10 mins and then it will loose power and stall and it wont even fire over for a few hours. Any suggestions on what I can look at to see what is wrong.
 
#3
Maybe, needle and seat, is it a float style carb? Possibly vaccuum in the fuel tank, will it run if the fuel cap is off? Um, does it run better at 1/2 choke, possible fuel mix issue?
 
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