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Date: Mon, 19 Dec 2011 16:15:22 -0500
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From: Lorn H Olsen <lorn@dynacomm.us>
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Subject: Re: Spark plug problem
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Art,

Champion plugs have resisters that gain resistance over time. What is =
the resistance of your plugs? All resistance should be between 1 and 2 =
thousand ohms.

When the resistance gets over 5,000 ohms, the plugs won't fire when wet =
(trying to start the engine). The high resistance plugs will then burn =
out the magneto coils. I have had this happen.

Who overhauled the mags? What does overhauled mean? What was tested and =
what was changed in the mags?

What kind of plugs are you using?

What is your phone number?

Call if you have any other questions.

Sincerely,
Lorn

> From: Art Jensen <flycassutts@yahoo.com>
> Date: December 19, 2011 10:00:42 AM EST
>=20
> Attached is one photo looking down into the barrel of a spark plug =
where you can see some arcing where the spring from the spark plug =
connector touches.  The second photo shows the end of the spring and =
evidence of arcing from the spring to the plug.  Evidence of arcing =
shows up in the downloaded engine data as well.  Question is has anyone =
seen this before and what was the solution to correcting this problem?  =
Having followed the instructions below, I am at a loss.  There are three =
plugs, #2, #4 and  #6 bottom plugs only with this problem.  The Slick =
mag that is operating these plugs was overhauled in February of this =
year.  When I put in new springs and changed the plugs the problem went =
away for approximately 3 flight hours but now is back.
>=20


--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan