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13 hours ago, Yammy125 said:

Why is my spark plug black and carbon? Mechanic recommend me to do top overhaul. Can i just adjust the mixture setting to become leaner instead?

Any photo of your plug? Having a brown carbon burned, black but not sooted on the electrode and thread is fine. Insulator nose turning carbon brown is fine too as its in the burning. (some may look as black, so photo of plug will be great). 
The main factor can be your fuel grade, what fuel grade are you using?
Are you using the correct Spark Plug Number? The number play a part from cold to hot plug.
Plug gap may also contribute but ... kind of hard to suggest.

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