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<body>IMO soot on the plugs always means you are running too rich, at least part of the time. Since idle mixture is fully adjustable, I would first check it by the book (lift the piston test), then if that still puts soot on the plugs, try going leaner a half flat at a time.<br><br>Note that it's also easy to get soot on the plugs when starting from cold, which may take some time to burn off, even running under load. Also, you should be looking at the insulator near the gap, as the metal shell may never get hot enough to burn the soot off.<br><br>Problems with float level (leaky float) or a leaky float valve can also cause sooty plugs.<br><br>My point of view, hotter plugs are only a workaround for things like excess oil consumption.<br>-- Randall<br><br><div class="gmail_quote">On 27 May 2019 13:17:09 GMT-07:00, Dave MacKay <dave@mdmackay.ca> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Hello:</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I’ve been running Champion L87Yc plugs in</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> my 1960 TR3A</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">, gapped to 0.025”</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">Although they’ve been fine, I’ve always been concerned ab</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">out the amount of soot on them at the end of each driving season. Thinking the soot might be dur to too rich a mixture, I rebuilt my carbs but didn’t notice any change in the amount of soot.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">It was suggested that I might want to try a hotter plug since that might burn away more of the soot.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"></font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">According to Champion, the next hotter plug to the L87YC would be</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">the L92YC.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> </font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">What concerns ought I be aware of in running a hotter plug</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">? </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">Has anyone of the list had experience with L92YC plugs?</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I researched other plugs that list members are using and found that several have had good success with NGK BP6HS. According to NGK those plugs have been discontinued</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">and the recommended replacement is the BPR6HS</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> (same plug but with a resisitor).</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> I thought I might try a set before moving to a hotter plug. </font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I’d w</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">elcome any comments.</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Dave MacKay</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">1960 TR3A s/n 68639L</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Near Toronto, Canada</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
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