Yard Machines 11A-020B000 20-Inch 148cc Briggs Stratton 300 Series M Logo

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roger swartz Posted on Sep 03, 2012
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149cc briggs and stratton lawn mower runs rough and uses more gas than normal

Cleaned air filter and changes plug but still runs rough and uses about twice the gas that it has in the past. It is between 2 and 3 yrs. old. It is washed down after every lawn mowing.

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Derrick Schultz

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  • Yard Machines Master 11,405 Answers
  • Posted on Jan 21, 2019
Derrick Schultz
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There's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few .. let me know if u need help
thanks

5 Related Answers

computerscot

  • 166 Answers
  • Posted on Jun 16, 2009

SOURCE: Briggs & Stratton Quattro lawn mower

A lot of time when the small motors on these push mowers surge it is a governing spring that is weak or broke. It does not hold enough tension and causes the valve to fluctuate. I have fixed this many time for a relatively cheap amount (under $5).

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Anonymous

  • 155 Answers
  • Posted on Jul 25, 2009

SOURCE: Mower stutters when i turn up to full throttle.

Hi if it is older than 2 years it will need a new diaphram and gasket under carby you will also need to clean out the fuel bowl in the top of the tank this should fix your problem.

Anonymous

  • 389 Answers
  • Posted on Sep 16, 2009

SOURCE: Having trouble with Mower...what to do?

Clean out the carburetor float bowl and main jet. Sounds like dirt or moisture in it

Anonymous

  • 1 Answer
  • Posted on Oct 22, 2009

SOURCE: how do i tighten the clutch for a Model 28b702

how do i replace cluths on snapper riding mower

Anonymous

  • 150 Answers
  • Posted on Oct 06, 2010

SOURCE: I have a briggs and

A champion cj 8 plug will work fine. As far as air filter it is probably a paper on, take the old one to a dealer or small engine repair shop and they can match it up for ya.

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if its a briggs and stratton engine with the plastic carb fixed to top of the fuel tank then you will need to replace the diaphragm and blow out the fuel pick up pipe
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This sounds like a problem with the suction. If the air filter is clean then it will need new carb gaskets. There may also be an issue with the pressure being created by the engine.
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