Small Engines (Lawn Mowers, etc.): 18.5 Briggs $ Stratton Model # 31P777 0348 E1, briggs stratton, valve spring

Question
This Motor Is Back Firing Out Of The Carb. How Can I Tell If It Is A Burned Valve Or What Ever Is The Problem? Anyway I Can't Afford To Take It To The Shop I Need To Learn How To Do It Myself & Save Money As I Am In Bankruptcy Already!!! So Please Help Me Fix My Mower So I Can Keep Mowing For My Landlord.

Answer
Gary,


  Carb backfiring is due to a worn intake valve spring not pulling the valve closed after it opens I am gonna give you an exploded view of your engine to work with I hope this helps.

http://www.briggsandstratton.com/pdf/illustrated_parts_list/100/MS5766.pdf
or
http://www.briggsandstratton.com/maint_repair/manual_and_more/docsearch.aspx?mod...