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Re: [Shop-talk] B&S mower engine, surging and dying. Ideas?

To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] B&S mower engine, surging and dying. Ideas?
From: Bob Spidell via Shop-talk <shop-talk@autox.team.net>
Date: Mon, 20 May 2019 20:54:28 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
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I had a surging problem on an ExMark--really, a tarted-up 
Toro--zero-turn and they ended up replacing the engine due to worn rings 
(intake manifold was getting oiled-up).  Don't ask me why, but nothing 
else--carburetion, spark, etc.--made sense either. We're talking a 
rhythmic pulsing, and not sputtering, right?  Worn rings might make the 
engine's power ebb-and-flow, I suppose.

Bob

On 5/20/2019 8:48 PM, Scott Hall via Shop-talk wrote:
> This. Sounds like it's running just long enough to get a vacuum on the 
> fuel tank, then starving for gas. Then sitting until the tank reaches 
> atmospheric again. Then repeat.
>
> On Mon, May 20, 2019, 7:43 PM Pat Horne via Shop-talk 
>
>     Try leaving the fuel cap loose to see if that helps.
>
>     Will it start up when it dies with starting fluid.
>
>     Peace,
>     Pat
>
>     Pat Horne
>     We support Habitat for Humanity
>
>
>     On May 20, 2019, at 4:57 PM, David Hillman via Shop-talk
>
>
>       Ok, I'm out of ideas.  Requesting new ones.
>
>       I have a Craftsman walk-behind mower with a 163cc Briggs &
>     Stratton 4-stroke engine ( engine: 104m02-0008-f1 to be precise
>     ).  It's only 3 or 4 years old, but it will not run.  And it's
>     starting to piss me off.
>
>       It starts normally ( no manual prime or choke, so it takes ~3
>     pulls but it always has ), and runs fine for less than 5 minutes. 
>     After that, it surges rhythmically and after a minute or so of
>     that, dies.  Following that, it will not re-start until allowed to
>     rest for a few minutes.
>
>       I have installed a new plug, new air filter, new carburetor, and
>     new ignitor.  I checked and set the gap on the plug and the
>     ignitor to spec ( .030" and .006-.014" respectively ).  Has clean
>     oil, and brand new gas. Fuel screen in the tank is clean, as is
>     the fuel hose to the carb. Carb bowl has fuel.
>
>       What else can be wrong with it?  It seems to be heat-related,
>     but it has no cooling system.
>
>       Thanks.
>
>     Obligatory Shop Content: I can't work on anything interesting
>     until this damn mower runs.
>
>
> _______________________________________________
>
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    <p>I had a surging problem on an ExMark--really, a tarted-up
      Toro--zero-turn and they ended up replacing the engine due to worn
      rings (intake manifold was getting oiled-up).  Don't ask me why,
      but nothing else--carburetion, spark, etc.--made sense either. 
      We're talking a rhythmic pulsing, and not sputtering, right?  Worn
      rings might make the engine's power ebb-and-flow, I suppose.</p>
    <p>Bob<br>
    </p>
    <div class="moz-cite-prefix">On 5/20/2019 8:48 PM, Scott Hall via
      Shop-talk wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAK73_u5nanVpqLCZrK0UQGus2wZcyxHisYXBUvE_9_7mZcqzfg@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="auto">
        <div>This. Sounds like it's running just long enough to get a
          vacuum on the fuel tank, then starving for gas. Then sitting
          until the tank reaches atmospheric again. Then repeat.<br>
          <br>
          <div class="gmail_quote">
            <div dir="ltr" class="gmail_attr">On Mon, May 20, 2019, 7:43
              PM Pat Horne via Shop-talk &lt;<a
                href="mailto:shop-talk@autox.team.net";
                moz-do-not-send="true">shop-talk@autox.team.net</a>&gt;
              wrote:<br>
            </div>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">Try
              leaving the fuel cap loose to see if that helps. <br>
              <br>
              Will it start up when it dies with starting fluid. <br>
              <br>
              Peace,<br>
              Pat<br>
              <br>
              Pat Horne <br>
              We support Habitat for Humanity<br>
              <br>
              <br>
              On May 20, 2019, at 4:57 PM, David Hillman via Shop-talk
              &lt;<a href="mailto:shop-talk@autox.team.net";
                target="_blank" rel="noreferrer" 
moz-do-not-send="true">shop-talk@autox.team.net</a>&gt;
              wrote:<br>
              <br>
              <br>
                Ok, I'm out of ideas.  Requesting new ones.<br>
              <br>
                I have a Craftsman walk-behind mower with a 163cc Briggs
              &amp; Stratton 4-stroke engine ( engine: 104m02-0008-f1 to
              be precise ).  It's only 3 or 4 years old, but it will not
              run.  And it's starting to piss me off.<br>
              <br>
                It starts normally ( no manual prime or choke, so it
              takes ~3 pulls but it always has ), and runs fine for less
              than 5 minutes.  After that, it surges rhythmically and
              after a minute or so of that, dies.  Following that, it
              will not re-start until allowed to rest for a few minutes.<br>
              <br>
                I have installed a new plug, new air filter, new
              carburetor, and new ignitor.  I checked and set the gap on
              the plug and the ignitor to spec ( .030" and .006-.014"
              respectively ).  Has clean oil, and brand new gas. Fuel
              screen in the tank is clean, as is the fuel hose to the
              carb. Carb bowl has fuel.<br>
              <br>
                What else can be wrong with it?  It seems to be
              heat-related, but it has no cooling system.<br>
              <br>
                Thanks.<br>
              <br>
              Obligatory Shop Content: I can't work on anything
              interesting until this damn mower runs.<br>
            </blockquote>
          </div>
        </div>
      </div>
      <br>
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