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Mower running rough

I have a briggs and stratton 40 quicksilver 46s on a flymo push mower and it is running fast/slow,also chucking out a bit of smoke,also using alot of petrol,any ideas?ta

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  • Samuel Charles Spriggs May 11, 2010

    Have you performed routine maintenance on the engine lately -- like air filter cleaning/replacement?


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  • 41 Answers

This engine may need overhauling,You seem to have either bad valves or rings, or both.

Posted on May 13, 2009

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Hi,I have a Briggs and Stratton Quicksilver 46SD, runs eratically and smokes

Hi,first take the old gas out of the mower and reflll with new.Restart mower and let run for two to three mins.....If it's still smoking you have bad piston rings.

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May 02, 2012 | Briggs & Stratton Garden

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I have a quicksilver 46s petrol need oil in the petrol ???

No it is either a Briggs engine or a Techumseh engine neither of which is a two stroke, so check the oil in the engine and run the machine on un leaded fuel.

Apr 16, 2012 | Garden

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I have a Craftsman Yard Man 6.5hp push mower with a Briggs & Stratton engine. The engine starts and runs fine for about 30 seconds or so then slowly dies out. It turns over slower and slower until it...

Have you checked the choke that it is off after you get the engine started,the black smoke is definitely from the choke, if you take the carb off and check that the needle closes when it should,as one can easily do an adjustment by bending the float/tab,rgds

Sep 25, 2010 | Briggs & Stratton Garden

1 Answer

I have a briggs and stratton quicksilver, just got some string stuck round blade and mower stopped turned it on it's side freed string started up and oily smoke coming out of exhaust

Not to worry. When you tipped the mower on its side, oil ran into the exhaust. Allow the engine to run few minutes and it will stop smoking. The B&S engine will put oil in the muffler if tipped to the left, and oil into the carburetor if tipped on the right. The only safe way to tip the engine is where the spark plug is pointed upward.
Don't forget to check your oil level and adjust as necessary.
Good luck!

Sep 05, 2010 | Briggs & Stratton Garden

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My flymo briggs & stratton quick silver 46d

Your carb needs to be taken apart and cleaned

Jun 19, 2010 | Briggs & Stratton Garden

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make sure button not cracked also fuel filter sits in bottom of tank get you a peice of coat hanger and fish it out just pulls off the end clean it good and also double check your carb sometime you can lose a gasket and it will cause similar issues? let me know if any of this helps ? can also tell you how to adjust high speed side of carb if all else fails?

Aug 29, 2009 | Garden

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