Hi people? My law star if I keep my fingers the hole of the c

Hi please help my lawnmower don’t star in order to star i use star fuel but don’t keep running by itself ,i have to pit my finger on the hole of the carburetor, how i make to star and keep it going thank very much for help

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How long does it run?

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If i keep closing the hole i believe a long time ! But if i let air going in them turned off

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