While you wait for answers, we may have found some information which could help you.
Click here for Years Ago Lawnmowermy briggs and stratton 3.5hp starts up then cuts out straight away?
Petrol or diesel?
lawn mower briggs and stratton classic 35?
My 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 won't start?