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Joz, it sounds like your motor only ran right that one time when you got it back from the mechanic, correct? And then the next time out it was hard to start and rough at low RPM? What happened in between - did you have the cowl off and / or make any changes?

If it is running OK at speed then chances are the carbs are OK - any excess oil should long since have been dissolved. Have you checked to make sure the priming lever (red lever on the side of the primer solenoid) is not set to the prime position?

Can you clarify the smoke situation when the rough running is occurring? I am still thinking overfueling, from either the primer valve or a leaking fuel pump diaphragm; either would result in additional smoke. If you are going to stick with premixing fuel you can replace the expensive VRO pump with the non-VRO version and the price is much less - around $70 when I did it 5 years ago.

Tim