Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Have you checked your air filter? If not, check your air filter. Did you clean your fuel tank, and replace your fuel filter, before putting on your new carburetor?
Many times, black smoke indicates that your carburetor is flooding. If you did not clean your fuel tank, and replace your fuel filter, sediments from your fuel tank could be inside your new carburetor, preventing your needle from seating properly.
Thank you for this information. What about your air filter?
Check to make sure your choke is not sticking ...
Thank you for your response. There is a small black wire attached to your ignition coil. This is your kill wire. Remove this wire, and give your mower another try. Let's see if this makes any difference.