is the mikuni and kogyo carb for the qt50 jetted higher?

so i have the k and n air filter for my moped and know that you have to rejet it. however i check my carb and it is a mikuni and kogyo one, which as far as i know is not the stock carbuerator. is it already jetted high? my spark plug is a dark oily brown and is hot when revving the moped with the k and n. is that an ok mixture

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