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your fuel mixture is too rich it may be time to change your spark plug and/or air filter. a bad spark plug will not burn all the fuel correctly and a clogged air filter will not provide enough air for a good air/fuel mixture. Actually it depends on what color smoke is coming from it. Black smoke is fuel, however, blue smoke is oil, broken ring and such

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Q: What does it mean when black smoke comes out of the muffler of your 6.75HP push lawn mower?
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