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I need some help.
I have a honda GCV160 and I have black smoke coming out and the lawnmower is having a hard time to run .
Replaced so far.
-carburator
- air filter
-spark plug
-oil
-new gas

Check your auto-choke assembly.
It sounds like the choke is staying on too long.

Do I need to replace something ? what about the black smoke >?

Replacement will depend upon the results your initial inspection reveals.
Black smoke may indicate a too-rich condition.
A sticking choke will produce black smoke.
If it's white smoke, they've named a new pope.
There's a whole section on the Auto-Choke in the Honda section here

I just purchase the Thermo Wax and the Control Assembly hopefully that will fix my problem .