Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Juan, after you replaced your carburetor, did you change your engine oil?
The smoke you are still seeing, is likely causes left over oil that remained inside your muffler, from before you replaced your carburetor. That oil will eventually burn from your muffler. Change your engine oil, and allow your engine to run long enough to burn the oil from your muffler. Afterwards, I believe your engine will be okay.
We can continue from here.
Thank you for clarifying. Is your engine Briggs & Stratton? Do you have the model numbers for your engine? I will pull up your engine and check for the mark on your cylinder.