Honda crf 450 cylinder wrap

I bought a 2005 crf 450r, and when i drive it the first time i realised that the bike iwas running with some problems,i took the cylinder head out and i saw that the gasket was torn out, than later i saw that the cylinder head was already machined but was still machined the wrong method. Can someone tell me how much is the dimensions for machining again the cylinder head????

Something may be getting lost in translation, but, how was the head machined incorrectly, or how do you know that? Are the valves out of adjustment?

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