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Best bet is to pull the carb apart.
These engines will run up to almost 1/2 throttle without a main jet even being installed. Next take a look at the float to verify it is sealing the needle/seat when inverted. The float should be parallel to the carb body, and the needle seated when the carb is inverted, and finally I would take a very close look at the slide diaphragm for cracks or tears. It may also be swollen or wrinkled looking from ethanol fuel. If it is, you can soak it in detergent/water for 10-15 minutes. That will pull the EToH out of the diaphragm, and give it a new lease on life.
Almost forgot... look at the main jet needle in the slide. Some have an "E" clip that will wear out the slots, and the needle will float around giving all sorts of wacky symptoms.
That clip should be in the center slot from the factory, and the main jet should be marked "102" or VERY close to that.
For shits, and giggles, a new spark plug, and fuel filter followed by a valve adjustment.
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