While you wait for answers, we may have found some information which could help you.
Click here for Carburetor Briggs Model
Petrol or diesel?
my briggs and stratton 3.5hp starts up then cuts out straight away?
Excessive Compression?
lawn mower won't start?
what causes my Briggs and Statton petrol mower to hunt ?
Just overhauled 16 hp Briggs ans Stratton engine ?