My yard man mower is blowing black smoke when I crank it. Why would this be?? It was low on oil, but we filled it up and it still smokes. Do we need to change the oil? If so how? It has a honda engine, and is 2 years old.

Like the other guy says drain the oil out. Disconnect the spark plug wire (for safety). Place the mower onto a stable platform to work from. To remove the drain plug usually you need a 3/8 ratchet and I use a short extension so I don't skin my knuckles. Put the extension end into the drain plug and remove. Have a drain pan to catch the used oil. Clean the area around drain plug first. When oil is drained replace the drain plug and tighten. Add your new oil. ONLY ADD ABOUT 15 OUNCES. Use SAE 30 motor oil. Once you get the oil in set it on a flat surface and check for the proper level. Add if needed. Usually the push mowers only use about 16 ounces. I start with 15 because it is easier to add than remove the oil. Replace the spark plug wire, prime and start. It may smoke awhile to get the old oil burnt up.

Its blowing oil out because you put to much in it under the mower you have a dran plug remove it dran the oil out. replace it with just 1 one qt of 30 wt you will be good to go . Good Luck.