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Some carbon build-up is normal and acceptable. It is also unavoidable. The engine does not need to be pristinely clean in order to run properly/healthy.

As others have mentioned, the only way to completely clean the engine will require that you perform unnecessary maintenance on the engine. Honing the cylinder for a new ring(s) wears the cylinder and risks damaging the cylinder - all for nothing.

Run your engine with a normally leaned mixture and stop worrying about a little carbon. If it really bothers you, some folks are running Bel-Ray two-stroke oil, which they claim eliminates carbon build-up. At $50 a gallon, it better do something different. <G>