Cub cadet SRC621 wont start

Check the oil level and see if it smells like gas. If it does change the oil.
Remove spark plug and hold the end of plug wire approx 1/4" from ground and spin engine. Do you get a blue spark? If so you have good ignition system. Install new spark plug.
Remove carb from engine. Spray about 1 second worth of starting fluid into the intake. Try to start engine. Should fire and run for a few seconds. If it does you have a carb problem.
 
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