ORIGINAL: lez1troubles
Take your engine to pieces and drop every thing in a tub of petrol, let it soak in for a while and then clean piece by piece with a fine tooth brush or paint brush untill you have it back in good clean condition and then put it back together.
This is what I would do. It would nag me to think there might be something in there that I missed. 2 Strokes are easy to break down and put back together.