<div><div>If there is a fuel shutoff valve, bypass it and see what happens. The plastic valve I removed from a similar engine has not yet been re-installed. The engine starts on the third pull everytime and doesn't shutdown until it is out of fuel or I switch it off. I do have to empty any left over fuel if I screw up and put too much in the tank.</div><div><br/></div><div>Brian</div><div><br/></div><div><font style="color:#333333"><i><br/></i></font></div></div><div class="elided-text">On May 21, 2019 00:25, Bob Spidell via Shop-talk <shop-talk@autox.team.net> wrote:<br type='attribution'><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>Addendum: 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>On 5/20/2019 8:54 PM, Bob Spidell via
Shop-talk wrote:<br />
</div>
<blockquote>
</blockquote></div>
<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>On 5/20/2019 8:48 PM, Scott Hall via
Shop-talk wrote:<br />
</div>
<blockquote>
</blockquote>
<div>
<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="elided-text">
<div dir="ltr">On Mon, May 20, 2019,
7:43 PM Pat Horne via Shop-talk <<a href="mailto:shop-talk@autox.team.net">shop-talk@autox.team.net</a>>
wrote:<br />
</div>
<blockquote style="margin:0 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">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>
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