<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>It could be oil fouling from valve guides. Umbrella type seals
will help, but you have to have some lubrication for those
valves. For the old ATVs when we went to high altitude, we had
to change the jets in the carb. Most industrial high altitude
engines were labeled not for use under 5000 ft, and the
compression ratio was about 8:1. Domed high altitude pistons are
as scarce as hen's teeth now. <br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 6/23/2019 5:29 PM, Szakaluk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:255144003.833713.1561328971680@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div
style="font-size:12pt;font-family:arial,helvetica,sans-serif;color:black;">Request
advice or suggestions on what I can do to reduce fouling on #4
spark plug on my 1951 Ferguson TO-20, here or to me direct.
<div><br>
</div>
<div>I've had it since 1990, only use it 8 or 10 hours a year.
Field mowing, snow removal, wood splitting (auger).</div>
<div><br>
</div>
<div>Using 10W30 oil, Champion D21 plugs, which I understand is
a hot plug for this application.</div>
<div><br>
</div>
<div>At first, I could go twenty or 25 hours between plug
fouling/cleaning. Only #4 is a problem, others are fine.
Using very little oil.<br>
</div>
<div><br>
</div>
<div>Now I need to clean #4 every six or seven hours.</div>
<div><br>
</div>
<div>Appreciate your suggestions on how I can reduce this
issue. I know someday the engine should be worked on, but
with this limited annual use I can't justify tearing it down.</div>
<div><br>
</div>
<div>Heavier oil?</div>
<div>Different plugs? If so, on all cylinders, or just #4?</div>
<div>Oil additives?</div>
<div>Other thoughts?</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div><br>
</div>
<div>Steve Zakaluk</div>
<div><a class="moz-txt-link-abbreviated" href="mailto:szakaluk@aol.com">szakaluk@aol.com</a></div>
<div>Falcon, CO</div>
<div><br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
AT mailing list
<a class="moz-txt-link-abbreviated" href="mailto:AT@lists.antique-tractor.com">AT@lists.antique-tractor.com</a>
<a class="moz-txt-link-freetext" href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com">http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</a>
</pre>
</blockquote>
</body>
</html>