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henrysfork1(at)msn.com
Guest

Posted: Fri Jul 13, 2007 3:40 pm Post subject: 912

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Need some help from the 912 drivers. Got a friend in hanger next door  who has 700 rpm drop on mag A. Mag B is 300 as it should be. He has checked  everything with ohm meter and can find nothing wrong. Has contacted the factory  boys and they haven't been able to help. Any ideas from you guys?

  

 Thanks for your ideas

  

 Dee Young

 Model II

 N345DY

  

 Do not Archive



   [quote][b]

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ppeerenbo(at)charter.net
Guest

Posted: Sat Jul 14, 2007 6:27 am Post subject: 912

Here is a couple of items I would look at.

 1. Spark plugs, get new ones installed.

 2. Check each spark plug cap. Look inside, feel the tang  engage.( this was my problem)

 3. Ohm check the coils, but swap the inputs side to side  to get the problem to transfer.

 4 Then swap outputs. trigger coils etc.

  

 What RPM is he using for his mag ck?

  

  

 Paul Model IV 912UL

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lcfitt(at)sbcglobal.net
Guest

Posted: Sat Jul 14, 2007 10:12 am Post subject: 912

Dee,



Paul's response kindled some memory.  The only time I had this problem was 

after moving the ignition module to the oil tank mount.  I had to lengthed 

two of the ignition wires to accommodate the new position.



What I found despite carefully marking both wires, I still ran the wires to 

the wrong cylinders, I believe 1 and 3.  The rpm drop on run-up was like you 

describe.



Lowell Fitt

Cameron Park, CA

Model IV-1200 R-912 UL Warp

1998 870 hrs.

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