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Joz, do you know what the mechanic did to convert to premix? Did he actually replace the fuel pump?

Also, do you notice a change in the color or volume of smoke when the motor is dying at low RPM?

I am thinking about a failed diaphragm in the fuel pump pushing fuel back into the crankcase, over fueling it at low RPM. Obviously if the mechanic replaced the fuel pump that is less likely.