Troy Bilt 5.5hp Self Propelled Mower "black soot spark plugs lawn" Questions

...black soot within 5 minutes of starting the mower. The muffler is coated in black soot. The lawn mower was given to me so I have no idea of its past maintanence A good place to start would be to ...

...black soot on it, it's running too rich for your altitude. Most lawn mowers are set to run at about 1000 feet of altitude to work in most areas. If you are well above that your air is thinner and the ...

black soot from the exhaust. Seems to be running rich. I've cleaned the air filter and installed a new spark with no improvement. What is the next logical step? Hi Make sure you are getting a nice

Black soot on spark plug Running rich to much fuelxxxxxxxxxxxxxxxxxxx

...starts great, runs for about 2 min and starts missing. will continue running for another 5 min and quits running. spark plug is coated with black soot/carbon check for oil gas mixture or its bad ...