RJ Gleason

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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meburdick

Agreed... Still curious what led you to suggesting that as a possible issue.

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RJ Gleason

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.

__________________
Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Senior Warden; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!

meburdick

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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Polaris650freak

^ exactly what I was thinking


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meburdick

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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Hengst

Good question. The plug did appear to not have been firing. But it did run good at idle and high rpm.

BC_Dan

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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Hengst

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