Small Engines (Lawn Mowers, etc.): small engine, carburator, fuel mix

Question
Hi Jhon.
thnx for helping me before.
my small engine starts now but wont stay on.
what do i do.
I cleaned the carburator changed the gas.
forgot to mention  that a friend before i got the motor, put mixed oil and gas in tha gas tank so thats why i cleaned the carb and flushed the tank.
do i need to just let her run for a bit till shee burns the old stuff, I dont know
she will run sometimes up to a minute and a half but will shut off after that.
thanx
alan

Answer
 Hello Allen:

 When you Cleaned the Carburator, did you Blow Out the Passages with Compressed Air? I suggest that Carburators be Soaked Overnight (not the Plastic one) and then Blow out All the Passages With Compressed Air. If the Fuel Mix was Left in the Carburator for more than 30 Days, then the Carburator is Really Gummed Up inside and the Soak will Release this Gum. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please.
I enjoy knowing the Outcome. Thanks.

 Good Luck

 Respectfully

 John