While you wait for answers, we may have found some information which could help you.
Click here for Hp Briggs StrattonAdding oil to mower ?
my briggs and stratton 3.5hp starts up then cuts out straight away?
Briggs and Stratton SP470?
lawn mower won't start?
McCulloch lawnmower parts removal ?
My Briggs & Stratton 10.5 engine will start but dies after about 15 mins?