While you wait for answers, we may have found some information which could help you.
Click here for Briggs Motor Startmy briggs and stratton 3.5hp starts up then cuts out straight away?
lawn mower engine hunting?
westwood t1200?
My Briggs & Stratton 10.5 engine will start but dies after about 15 mins?
lawn mower briggs and stratton classic 35?
litres of oil needed in a countax c600h ride on lawnmower?