While you wait for answers, we may have found some information which could help you.
Click here for Briggs Engine Primelawn mower briggs and stratton classic 35?
Briggs and Stratton SP470?
My Briggs & Stratton 10.5 engine will start but dies after about 15 mins?
Petrol or diesel?
McCulloch lawnmower parts removal ?
litres of oil needed in a countax c600h ride on lawnmower?