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Addendum:Â I'm beginning to think this might be a characteristic of
air-cooled engines (air-cooled engines have larger clearances to begin
with). I've never seen/heard a liquid-cooled engine do exactly this
but, then again, I don't recall any aircraft engines doing it--they have
dual ignition systems, maybe that makes a difference?--and, if one did,
I wouldn't fly behind it.
Bob
On 5/20/2019 8:54 PM, Bob Spidell via Shop-talk wrote:
>
> 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.
>>
>> Â 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.
>>
>> Â 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.
>>
>> Â 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.
>>
>> Â Thanks.
>>
>> Obligatory Shop Content: I can't work on anything interesting
>> until this damn mower runs.
>>
>>
>> _______________________________________________
>>
>> Shop-talk@autox.team.net
>> Donate:http://www.team.net/donate.html
>> Suggested annual donation $12.96
>> Archive:http://www.team.net/pipermail/shop-talk
>> http://autox.team.net/archive
>>
>> Unsubscribe/Manage:http://autox.team.net/mailman/options/shop-talk/bspidell@comcast.net
>>
>
> _______________________________________________
>
> Shop-talk@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.96
> Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/bspidell@comcast.net
>
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<p>Addendum:Â I'm beginning to think this might be a characteristic
of air-cooled engines (air-cooled engines have larger clearances
to begin with). I've never seen/heard a liquid-cooled engine do
exactly this but, then again, I don't recall any aircraft engines
doing it--they have dual ignition systems, maybe that makes a
difference?--and, if one did, I wouldn't fly behind it.</p>
<p>Bob<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 5/20/2019 8:54 PM, Bob Spidell via
Shop-talk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:844aaa2e-1e86-c94c-8c9f-f8ab94c17855@comcast.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<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 <<a
href="mailto:shop-talk@autox.team.net";
moz-do-not-send="true">shop-talk@autox.team.net</a>>
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
<<a href="mailto:shop-talk@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">shop-talk@autox.team.net</a>>
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 & 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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wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:Shop-talk@autox.team.net";
moz-do-not-send="true">Shop-talk@autox.team.net</a>
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/shop-talk";
moz-do-not-send="true">http://www.team.net/pipermail/shop-talk</a> <a
class="moz-txt-link-freetext" href="http://autox.team.net/archive";
moz-do-not-send="true">http://autox.team.net/archive</a>
</pre>
</blockquote>
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<pre class="moz-quote-pre"
wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated"
href="mailto:Shop-talk@autox.team.net";>Shop-talk@autox.team.net</a>
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/shop-talk";>http://www.team.net/pipermail/shop-talk</a>
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href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
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