Small Engines (Lawn Mowers, etc.): Scotts Mower L1742 doesnt start, scotts lawn, pug hole

Question
I have a scotts lawn mower model L1742. engine info model - 31F707 type - 0112 E1 code - 0204012A.
Until 2 weeks it worked fine and then one morning I started it and it spluttered so I shut it off and then tried to start again and it didnt. Heres hat happened after that.

1) Removed spark plug. It was all black and looked real bad. So replaced it. Checked for spark with the new one and had a good sharp blue spark. Tried starting, just turned but didnt start.
2) Replaced air filters. No luck
3) Changed batteries. Started, spluttered. So I shut it off, tried again and no start.

4) Sprayed carb cleaner to the carburetor. Just turns no start.

5) removed the carburetor. Discarded the old fuel. Add some STABIL to the new fresh fuel . Sprayed carb cleaner at the carburetor and cleaned as much as I could without taking it apart. Replaced the fuel filter. Put everything back together and tried to start. No luck. Didnt even turn. Using booster cables connected my car battery to the lawn mower battery and tried the key and it turned again with no start.

6) Checked the sparkplug. Seemed very dry.
6) Put a teaspon of fuel into the hole of the spark plug and tried to start. No luck. Simply turns.

Please help. Thank you very much

Answer
Might want to check the flywheel key, it may be sheared or partially sheared. As long as you have a snapping good blue spark step away from the ignition system. Have you placed your finger over the spark pug hole and felt good compression while it turns over? if the fly wheel key is good, and it has good compression, and a strong blue spark I would suggest a carb rebuild....Tom