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My 21 HP diesel zero turn mower starts blowing black smoke after running at higher throttle settings and temp gauge shows engine is warm. No air restrictions. New fuel filters. smooth running when cool or low throttle setting. Smoking starts suddenly and will eventually stall the engine if left to run at high throttle setting.

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Looks like you've got a good idea on what makes diesels smoke, so I'm sure you know that black smoke is almost always from too much fuel for the air that's going in. So it can be too much fuel or too little air. If your filters are good, the next things to check are the fuel pressure and the injectors.

I know diesels, but I don't have any specific experience with lawn mowers (kubota?). Since it stalls eventually, it sounds like it's not a single cylinder (although not for sure) so I'd check injector pump first.

Posted on Sep 28, 2009

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