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Black smoke comes out when shutting down the JD 125 engine

compiler
9 years ago

My JD 125 tractor has a loud pop sound when shutting down the engine. Some people have answered I should let the engines idle for minutes before shutting down the engine. But, I also see the black smoke comes out. I just changed engines oil and spark plugs not long ago. Is the black smoke normal? Should I add the diesel or gasoline, by the way? Thank you for your answer.

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