OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Honda Engines Honda Side Valve Push Mower

Black/dark smoke is an indication it is running rich, not burning oil which is usually white smoke.The first thing to try would be a good known working plug to eliminate a dodgy plug being the cause. Then go back to the the carb and check it is running fine with the air filter out to make sure that is not the culprit.