Small Engines (Lawn Mowers, etc.): briggs and stratten engine wont start, briggs straton, briggs and stratton

Question
i replaced alternator now it wont start only backfires-its a pony troybuilt briggs& straton 17.5 hp model31c7070154e1

Answer
Hello Ed:

>>Did you Tighten the Flywheel Correctly.
>>The Torque for the Flywheel Nut is 100ft Pounds.
>>If the Flywheel was Not Tightened Correctly, then the Flywheel Key was Damaged the First Time you Attempted to Start the Engine and the Flywheel Key is now Damaged and Requires Replacing.
>>You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.outdoordistributors.com/ and Select the B. Then Select Briggs and Stratton. Then Select Don't have Part Numbers. Then Select the File #31 . Then Select the Folder #31C700.
>>Did you Set the Coil to the Correct Air Gap from the Flywheel?
>>***Anytime a Magnet that is Set to the Correct Distance from the Armature/Ign Coil Pickups, the Armature/Ign Coil will Fire the Plug if it is Good. The Armature/Ign Coil Gap should be .020in between the Flywheel and the Armature/Ign Coil Pickups. You can Use a Side Panel from a Drink Carton (Mt Dew, Pepsi, ect) and Place it Between the Flywheel and the Armature/Ign Coil. Allow the Magnets on the Flywheel to Pull the Armature/Ign Coil Together and then Tighten the Armature/Ign Coil Bolts. Carefully Turn the Engine while Pulling the Cardboard Out from between the Armature/Ign Coil Pickups. The Armature/Ign Coil is Now Properly Set.***
>>If you Hit a Snag or this Does Not Correct the Problem,  I Hope to be Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 5 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.

Respectfully

John