Also keep in mind that most carborators are set a the factory and you don't need to start twisting them like you would a glow engine.  Just a little at a time is all you need to move them, maybe 1/32" of a inch at a time.  Remember to that Gas engines need a break in period and get better after 2 or more gallons of gas has been run in them.  Use a good quality 2 cycle oil, not chain saw oil but something like racing oil for a motorcycle or outboard engine would use.
One it is broken in, go to AMSOIL and your engine will last for ever. I have a 12 year old G-62 that still runs great.
George Jenkins, Troy Built Models.