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I have a Murray 20'' mower with a 3.5 HP B&S engine on it and for some reason I can get it to start, but it runs SUPER rough. I changed the plug, oil, and cleaned the carb and still it is running bad. Any ideas?

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  • LeeatCSE May 11, 2010

    Have you changed the gas? Also could be an issue with the head gasket or valves.

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Piston is cracked

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