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post #21 of 29 (permalink) Old 12-14-2012, 03:55 PM
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Easy to test for.
Get and inline spark detector {about $8 each} and the start the engine.

A bad plug can show spark as long as it's laying on the head, but when under compression it will not fire.

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post #22 of 29 (permalink) Old 12-14-2012, 04:02 PM
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Agreed... Still curious what led you to suggesting that as a possible issue.

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post #23 of 29 (permalink) Old 12-14-2012, 04:10 PM
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Because he has spark on the other two an this is a "wasted spark" system.
It's not oil, it's not lack of fuel and the compression is good. That leave only one thing, NO SPARK.

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post #24 of 29 (permalink) Old 12-14-2012, 04:54 PM
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So, residual spark not used by either outboard cylinder is "routed" to the middle cylinder? Is that the theory?

Why can lack of fuel be ruled out? He said that the two outer plugs were a nice tan but the middle one was clean. If it wasn't getting spark, wouldn't that plug at least be wet (if not fouled)?

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post #25 of 29 (permalink) Old 12-14-2012, 05:24 PM
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^ exactly what I was thinking


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post #26 of 29 (permalink) Old 12-14-2012, 06:11 PM
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RJ,

Don't get me wrong here... I'm just trying to figure out what I didn't see that you did.

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post #27 of 29 (permalink) Old 12-14-2012, 07:50 PM Thread Starter
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Good question. The plug did appear to not have been firing. But it did run good at idle and high rpm.
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post #28 of 29 (permalink) Old 12-14-2012, 09:12 PM
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In a "lost spark" ignition system, each plug fires at the same time. In a triple, that means each plug fires three times per revolution. One of the sparks ignites the fuel, the other two are lost. If the outside cylinders are getting spark, it would make sense to check the center for spark. Could be a bad plug or a bad wire, or a bad coil. The plug should be wet if it's not firing, and the center cylinder will be cooler than the other two. It's easy to check for; switch the wires around. If the problem follows to the cylinder the wire is on, it's electrical. If the problem stays on the center, suspect carb.

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post #29 of 29 (permalink) Old 12-15-2012, 05:40 PM Thread Starter
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Wont be able to dig back into it till tuesday. Let you all know what i come up with. Thanks for the help.
Interesting exchange on spark by the way
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