----------------------------------------------------------
                           Yak-List Digest Archive
                                      ---
                     Total Messages Posted Sun 08/30/09: 3
           ----------------------------------------------------------
 
 
Today's Message Index:
----------------------
 
     1. 08:36 AM - Another YAK-52 for the database  (John P-S)
     2. 04:38 PM - Greasey Side Up   (Roger Kemp M.D.)
     3. 07:23 PM - Excessive R Mag Drop  (Scott Poehlmann)
 
 
 
________________________________  Message 1  _____________________________________


Time: 08:36:24 AM PST US
Subject: Yak-List: Another YAK-52 for the database
From: "John P-S" <Jprice_stephens@hotmail.com>


RA3429K c/n 9111583 seen Konstanz 20.8.09

Cheers,

john


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=260476#260476


________________________________  Message 2  _____________________________________


Time: 04:38:11 PM PST US
From: "Roger Kemp M.D." <viperdoc@mindspring.com>
Subject: Yak-List: Greasey Side Up 

Josh,

If you are still lurking contact me off list.

Doc


________________________________  Message 3  _____________________________________


Time: 07:23:24 PM PST US
From: Scott Poehlmann <scott-p@texas.net>
Subject: Yak-List: Excessive R Mag Drop


Hi Guys,

My lovely M9F (okay, "Phi", but I don't have that key on this 
keyboard...<VBG>) magnetos (mounted on a Yak-55M) seem to have developed 
an issue, and I need some help toubleshooting it. The problem is an 
excessive mag drop on the right (#2) mag. Mag checks done between 60% 
and 65% yield a 2.5-2.9% drop on the Left mag (#1) and (initially) a 
9.5-9.9% drop on the Right (#2). Here is what I have done so far and the 
effect:

1) Replaced the plugs (NGK BR7HS gapped at 0.25). No effect. N.B., the 
ignition wires are US 8 mm automotive wires and are just over 18 months old.
2) Checked the point gap (and cleaned everything in the top of the mag 
with Isopropanol). Gap correct at 0.3 mm. No effect.
3) Reset the distributor rotor to full "aft" (i.e., opposite the 
direction of rotation) position. No effect.
4) Reset distributor rotor to mid-position. Decreased drop on Right mag 
to about 8.5%.
5) Reset distributor rotor to full "forward" position (i.e., in 
direction of rotation). Decreased drop on Right mag to about 7.7-7.9%.

This is the best that I can get. Obviously, this isn't good enough...

Any ideas on what the problem is and (more importantly to me), what the 
solution is? Preferably without recourse to "buy a new mag"...

I'm stumped.

Thanks,

Scott Poehlmann
Yak 55M N155YK


 

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