As I said before, this sounds really strange...
You said that the engine 'kicks back' and breaks the kick starter, is that really what it feels like?
Is it possible that the ignition timing is completely wrong, like very advanced? Could it be firing before TDC (Top Dead Center)??
But if the ignition timing was that far out then the engine wouldn't run at all, can you get it to start now?
So if you're sure there's no mechanical restriction then I guess it would be worth checking the ignition timing.
I guess there is a woodruff key in the end of the crankshaft to locate the flywheel and fix the ignition timing, could the key have sheared or be missing, allowing the timing to slip?
Just another thought...is the exhaust pipe, expansion pipe, silencer completely clear and not blocked?
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