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Larry in Ill 
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Joined: 23 Feb 2012
Location: Central ILL
Points: 129
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 Topic: Magneto spark
Posted: 20 Sep 2012 at 7:55pm |
I'm testing my spare magneto and can only get a spark on cylinder 2 & 3. It has a good spark so what could be the problem?
Thanks
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22825
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Posted: 20 Sep 2012 at 8:03pm |
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When you flip it around, does it spark every time you flip it a half turn but just spark off 2 or 3 or does it skip a spark twice in 2 revolutions?
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Posted: 20 Sep 2012 at 8:13pm |
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what magneto? an RV4 or RV4B has a specific set of possibilities Which model do you have??
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Larry in Ill
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Joined: 23 Feb 2012
Location: Central ILL
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Posted: 20 Sep 2012 at 9:07pm |
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It is a fm j4b3 and it sparks every other cylinder. I bent the copper contacts closer to the rotor thinking the rotor was bad, and one sparks, but the other is still dead.
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Dick L
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Joined: 12 Sep 2009
Location: Edon Ohio
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Posted: 21 Sep 2012 at 6:05am |
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Any time I have had a magneto give a good spark on one or two wires and not on the others it was solved with a new or different cap.
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Fred in Pa
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Joined: 13 Sep 2009
Location: Hanover Pa.
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Posted: 21 Sep 2012 at 7:18am |
Are you hand cranking ????? inplause may not be working at cranking speed.What do you call testing and how are you going about the test ??
What mag ? ,all B,C,CA, WD, WC , spark in rotation,unless it is a RV4.
Edited by Fred in Pa - 21 Sep 2012 at 7:22am
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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Larry in Ill
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Joined: 23 Feb 2012
Location: Central ILL
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Posted: 21 Sep 2012 at 8:09am |
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It is for a C and I was hand cranking the engine. I took it apart this morning and have an intermitent spark at the points.
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Dick L
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Joined: 12 Sep 2009
Location: Edon Ohio
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Posted: 21 Sep 2012 at 12:54pm |
Could be one of the pawls is rusted fast or rounded and not holding on the stop pin under the spring. That would cause spark to skip a plug and spark the next.
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