Small Engines (Lawn Mowers, etc.): Engine Back Fires, briggs and straton, wd 40

Question
I have a 252707   0132-01 80061 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
Billy
The wiring for the engine is not compatible for this new frame,is this a lawn tractor, snow blower? What are you hooking up this engine to. You need to take the stator from the engine you replaced and install that in the new engine,it will work the thing you will need to pull the flywheel and the cover etc on the housing.