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If you have a Briggs and Stratton engine and there is no clutch then start your machine and warm it up ( a couple of mins) Turn machine on it\'s side with the air filter UP. Loosen the plug on the bottom of engine and turn mower back upright over an oil tray or suitable container to catch the oil. When done draining reinstall plug and add oil 30W. If you do have a clutch under the deck then warm your engine ,shut down and remove the oil dipstick. Turn mower on side over a tray and your oil will come out of fill tube
Did you tilt the mower on its side when changing the oil? Be sure the oil is at proper level. Be sure the air filter is not saturated with oil or fuel. If it is replace it. Start and run mower outside. The smoke should clear up after a few minutes of run time
Look for a drain plug under the deck in the bottom of the engine (under the deck) known as the crankcase housing. Drain plugs come in different forms, but you will know it when you see it. IF there is no plug on the engine bottom, then check for a small plug on the side of the engine (above the deck) with a square head. That would be removed and the mower tilted that way to drain the oil. If no plug on the side of the engine then the oil will have to be drained out the oil filler tube. Remove the dipstick and tilt the mower that way to drain the oil.
Did you replace the blade with a heavier blade, or an identical one? If the pull cord won't pull, it's usually either the blade or the blade shaft causing the problem. Try oiling the shaft and making sure nothing is obstructing the blade from turning.
If you have a pair of heavy gloves, try turning the blade by hand and see if it moves. Squirt some oil onto the shaft where it meets the mower and try turning it again.
On many Tecumseh engines, there is a crankcase breather located under the flywheel. It has a cork gasket to seal the top plate of the breather. Either the rubber breather housing is cracked, or the cork gasket needs replaced.
Your mower should definitely have an air filter whether it is paper or foam, and you should drain the oil from the bottom, not turning it over. turning it over can get oil in places where it shouldn't be and make it smoke or not run at all. It may need carburetor cleaning and spark plug cleaning or replacement, or the flywheel key may be sheared if it runs rough