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<p>The first thing that comes to mind is the piston contacting the
ground terminal of the plug. But if that were the case there would
be noise, I would think, and the starting would revert to terrible
quickly. Perhaps there is a piece of carbon floating around inside
the cylinder that occasionally gets pinched between the piston and
the plug? I just can't visualize anything else. If the head isn't
to difficult to get to you might pull it and check for something
like that. Is that a flathead or an OHV engine?</p>
<p>Phil in TX<br>
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<div class="moz-cite-prefix">On 11/29/2019 6:11 PM,
<a class="moz-txt-link-abbreviated" href="mailto:craig.warner47346@frontier.com">craig.warner47346@frontier.com</a> wrote:<br>
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I’ve got a question that’s kinda antique tractor related
(depending on how you define antique.) I have a 1992 Ingersoll
6018 with an Onan 16hp motor. It usually starts and runs great.
Last few weeks it’s been terrible to start but then runs fine. I
pulled the plugs today and the gap was close to nothing in both of
them. Opened the gap to.030 and it fired right up. Why would the
plug gap close? I had issues with them this spring and set it at
that point.
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<div>Thanks,</div>
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<div>Craig</div>
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