What folks don't realize is that running the mix too rich (lots of 2 stroke oil) actually has a leaning effect on your air/fuel. You can actually cook a piston with bubba's good intentions (more is better with the oil right?)
Did the old plug have any small aluminum flecks on it?
The collective advice you have gotten here should have you up and running. All I can do is give a +1 to all the comments on the lines (including the impulse line and diaphragm), making sure the crank case isn't wet with fuel, etc.
compression, spark and fuel. If you have those covered you're golden.
Sounds like one of the 3 insufficient in this case.
