Whoa! Hold up, don't put plug the air filter and don't plug the exhaust. Plugging the exhaust only chokes the engine (making it stall and eventually die faster) and using the air filter will make it way too rich. By stopping the flywheel with your shoe, no choking will happen and the air/fuel mixture will stay the same as it stalls. After you stop it, start it again one last time and let it run out the rest of the fuel that's in the engine. Make sure you apply a few drops of after run oil when you're done.