Uneven Engine Speed

wpollock

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Sep 10, 2016
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I have a 6hp Briggs on a Toro GTS Recycler mower which I have posted about in this forum before and have received generous and informative answers. This engine is self-governed when it comes to how fast it runs and it varies little even under a heavier cutting load. It has, for the most part, run consistently at the same rpms until yesterday when it started to act as if the engine is losing fuel supply even though it has a full tank. It belches a puff of black smoke every once in a while and has yet to die when running. I have used it for 4 full mowing seasons having only rebuilt the carb the year I got it. Could my issue possibly be related to it needing a new spark plug?
Thanks for the thoughts.
 
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