Black smoke would indicate it is burning oil, Has the machine been working on an incline.? check valve clearences. My guess is that oil is somehow getting into the cylinder.
SOURCE: Hard start or won't start
the float in the fuel bowl might be getting stuck what you can do is push & pull on float to see if it flows if not the replace the float if i can help further e-mail me wade @ [email protected]
SOURCE: Craftsman Lawn Tractor/ hard start/ whitish smoke
does it turn over slow or fast if it turns slowly thats the problem so it could be battery or starter they have to have a good amount of rpms to burn fuel right when starting if not it floods out the engine with gas hope this helps thanks wade
SOURCE: Tractor wont start
For a small gas engine than won't start, think FAST -- Fuel, Air, Spark, Timing. You've replaced the filters and spark plugs and squirted in some starter fluid, eliminating the simple common fuel, air, and spark problems -- but I because of the backfiring I think your problem is in the timing -- like a sticking valve. Probably more than you want to tackle at home, but might not be as expensive as an engine replacement. Take it to a good small engine mechanic -- best bet is a lawn equipment shop that has been around many years. Drive a little farther to get to one if necessary.
SOURCE: Craftsman 26 hp Kohler engine 54
to be honest the enigne ahas a control that the left side must fire and run before the right starts to fire it sounds to me like you have a fuel issue possibly the carb. is gummed up and dirty.
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