Small Engines (Lawn Mowers, etc.): Engine backfires, briggs and straton, carburetor body

Question
I have a 252707 Briggs and Straton 11 hp engine.  The engine was running when parked for about 3 years.  I took the engine out and place it on another frame, wired it up like the engine I took out was wired up.  The only difference I could see in the wiring was the strator on the engine I put in had an AC and Dc wire from the strator, the engine I took out only had a DC wire. I connected to the dc wire in the engine I put in and left the AC wire free.  I cleaned the rust from the flywheel and armature, (forgive spelling) changed oil, sprayed some WD-40 on top of the piston, turned over several time, filled with fuel and put in a new spark plug.  When I tire to crank it I get a back fire through the carb.  Have I done something wrong?  What do you suggest?

Answer
Hello Billy:

The Intake Valve May be Stuck Open or May Not be CLosing Properly. The Carburetor May Require Soaking and Cleaning. I Suggest, since this Engine has Sit for So Long that you First,  Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl, Float Pin, Float (if Applicable)  and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required. Once the Carburetor is Clean and if the Problem is Not Corrected, then Remove the Cylinder Head and Check the Valves for Proper Operation. The Flywheel Key May be Damaged and will Cause this Problem. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model and Type Numbers (first 4 digits Only). Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 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. Thanks.

Respectfully

John