I know just enough about 2 strokes to get me in trouble, but one thing I do know is if you have a vacuum leak since the crank case is vacuumed it will not pull fuel into the cylinder and if a reed valve is leaking same thing. They have special gauges for checking 2 stroke vacuum. I had a customers with the same problem and it turned out to be the crank seals leaking so the crank case was loosing enough vacuum to where it would not run.
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