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Two strokes do send unburnt Fuel(gas and oil) out the Exhaust, just the Nature of the Beasts. However if it is excessive, then at least one of the Cylinders is running too rich, or is not firing
Check the fuel pump diaphragm, I think you have a hole in it and the cylinder driving the pump will get fuel right through the crank case and push it out the exhaust down the leg.