We may have found other answers which could help you.
Click here for Lawn Mower Engine Carburetor
Excessive Compression?
lawn mower engine hunting?
my briggs and stratton 3.5hp starts up then cuts out straight away?
Just overhauled 16 hp Briggs ans Stratton engine ?
How to fix a problem with briggs&stratton hp407engine?
lawn mower briggs and stratton classic 35?