Does someone know how to shut off the electrical plug at the bottom of a v-twin briggs and stratton. I think this is causing my motor to smoke bad out the exaust. thanks

Are you refering to the solonoid on the bottom of the carb? That is an anti backfire device. It will not cause the motor to smoke. If it has failed the motor will not run; the solonoid prevents fuel from entering the main jet.
There are several things that wil cause a motor to smoke. First check for fuel in the crankcase. To check for fuel in the crankcase, it is hard to see on the dipstick, remove the dipstick and VERY CAREFULLY away from anything flammable and away from the motor hold a lighter to the dipstick. If the dipstick lights it has fuel on it, a lighter will not ignite oil. Blow out the flame and wipe the dipstick clean with a rag before inserting back into motor. A worn needle or debris in the needle will cause the carb to flood. It will fill the crankcase and muffler with fuel. To cure this you will need to rebuild the carb and change the oil. Installing a shut off valve in the fuel line will prevent this in the future. After the service has been done the unit may smoke for 5-10 minutes while it burns off the fuel in the exhaust.
Burning oil indicates stuck rings, overfilled oil, or worn valve guide seals ( valve guide seals will smoke on start up then clear up).
Also leaking rocker covers will drip oil on the exhaust and burn off.