What wrong next to my mower? I have a Craftsman 6.5 hp mower and it's be acting...

I have a Craftsman 6.5 hp mower and it's be acting very slow lately. My mom took it surrounded by for servicing not long ago and ever since she got it final it's been sputtering out smoke and the mover isn't adjectives very swiftly. It's not the gas and there's already enough grease. Any help is appreciated.
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Answers:    nick it back to the shop and asked them what they did to screw it up..and check the spark plugs...
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I'm going to guess that the shop guys didn't adjust the carb squirt correctly. It sounds like the carb is on the same wavelength too rich, that is getting too much fuel. Try this, find the screw on the side of the carburetor, nearby may be two, and crank the mower. You may have to remove the upper air filter first. Check it to make sure it is verbs, but it should be after servicing. After the air filter is removed and the mower running, use a screwdriver to slowly turn the screw clockwise. If the mower picks up speed afterwards you have solved the problem. Good luck.
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