honda 160cc will start run for 5 mins and will die

[64n8771m]

I choke the engine and it will run for 5 mins. then die . After it sits for a while it will start and run for a short while . Any Ideas ? Its about seven yrs old . I did change the spark plug .

 

[SeniorCitizen]

I'd check the gas tank cap vent hole for obstruction if the honda is vented like other mower tanks.