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My YSM12 blows excessive black smoke justafter start-up and no longer seems to have as much power. What is the likely reason?

April 26, 2017Black blows likely longer power smoke start-up

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My YSM12 blows excessive black smoke justafter start-up and no longer seems to have as much power. What is the likely reason?

1 Answer

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A. A leaking head gasket may be caused by a blocked exhaust mixer elbow.If a U-bend mixer elbow is fitted, every 2 years, remove, thoroughly clean and inspect the elbow.