Yak-List Digest Archive

Sun 08/30/09


Total Messages Posted: 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


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    Time: 08:36:24 AM PST US
    Subject: 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


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    Time: 04:38:11 PM PST US
    From: "Roger Kemp M.D." <viperdoc@mindspring.com>
    Subject: Greasey Side Up
    Josh, If you are still lurking contact me off list. Doc


    Message 3


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    Time: 07:23:24 PM PST US
    From: Scott Poehlmann <scott-p@texas.net>
    Subject: 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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