While you wait for answers, we may have found some information which could help you.
Click here for Engine Puffs SmokeBriggs and Stratton SP470?
lawn mower won't start?
my briggs and stratton 3.5hp starts up then cuts out straight away?
Adding oil to mower ?
lawn mower briggs and stratton classic 35?
How can I fix Mountfield Laser Omega 46 Lawnmower?