Agree with BG - try a new plug - a dud plug is a cerain "no-goer"
BUT next time don't prime the cylinder with starter fluid - try just a "goodly" spray into the air intake - it's very easy to "flood" these little 2 strokes - and once flooded they wont start until the air fuel mix comes back to normal.
So, once you have a new plug installed, on a cold engine, prime the carb, set the choke to full rich and give the air intake a spray with starter fluid and give the "little devil" a few good pulls and it should start.
As soon as the engine starts - reduce the choke gradually back to nil