What I use, based on quite a bit of experience with two strokes, is Pennzoil for Aircooled Engines until the engine is well broken in, then I switch to Amsoil. I've seen engines with 800 or more hours on them with virtually no carbon build up and hardly any wear using this system.

This is of course assuming near perfect jetting (mixture). Any gas two stroke engine will carbon up if the mixture is too rich.

AV8TOR