You could try cleaning the spark plug. That worked for us. Take the spark plug out with a wrench and use sandpaper to clean it.
One can purchase parts for a used Briggs and Stratton lawn mower from the following sources: Mower Graveyard, eBay, Briggs and Stratton, Zangler Repair, Lowes, Discount Online Parts.
Because its a pos I have a brand new one that won't start.
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You can find the operator's manual for that engine at www.briggsandstratton.com. You will need to contact the manufacturer of the mower for the lawn mower owner's manual. Briggs and Stratton did not amke that mower, only the engine.
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It is a 2-cycle 4HP Briggs motor.
Check the underneath of lawn mower for grass built up.
Briggs and Stratton is a select brand of lawn mower. When oiling one's Briggs and Stratton lawn mower engine, it is best to use a high quality oil. One can find such an oil at their local home improvement store, such as Home Depot.
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go to briggsandstratton.com
You should always have 20 fluid ounces of oil in a Briggs and Stratton 5.5 HP lawn mower. This equals out to roughly 1.6 quarts.