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Carbon on the back of the valves is pretty much standard when they get used, especially on the street.

Those deposits come from the combustion cycle and unless it's being used wide open it will happen, it's a byproduct of big cams and low RPM
 

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You'd be shocked at how much of that crap will come off if you flog the bike long enough with a decent map in it.
I've put used engines in race bikes with NASTY looking valves and after a few race weekends the back of the valves look brand new. Gasoline is a great cleaning agent lol.
 

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especially race fuel lol
 
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