While you wait for answers, we may have found some information which could help you.
Click here for Briggs Stratton LawnmowerMy Briggs & Stratton 10.5 engine will start but dies after about 15 mins?
litres of oil needed in a countax c600h ride on lawnmower?
lawn mower engine hunting?
Briggs and Stratton SP470?
my briggs and stratton 3.5hp starts up then cuts out straight away?
McCulloch lawnmower parts removal ?