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Thread: Mag issues

  1. #1

    Join Date
    Feb 2006
    Cortez Colorado
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    Mag issues

    It appears that my left mag is getting tired. My 0-320 engine was getting hard to start so had the plugs changed last annual which helped some. However the rpm drop increased for the left mag with the new plugs, a little over 100 rpms. It is still hard starting sometimes.
    My question is should I have the mag rebuilt or go with a certified e-mag? Anyone have experience with the SurFly ?

    Sent from my iPhone using SuperCub.Org mobile app

  2. #2

    Join Date
    Nov 2002
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    What mags do you have now?
    Likes mike mcs repair liked this post

  3. #3
    wireweinie's Avatar
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    Aug 2013
    Palmer, AK
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    When is the last time these mags had a 500 hr inspection?

    Life's tough . . . wear a cup.
    Likes mike mcs repair, G44 liked this post

  4. #4

    Join Date
    Sep 2003
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    One Super Cub around here was getting those "lemme see a photo" annuals. I had to ferry it from a local airport one day, and noticed it was climbing poorly.

    Mags had worn in the cam and point area, causing the timing to be seriously retarded. Cams were worn to the point where it was difficult to get them set correctly.

    Overhauled both. Fixed.

  5. #5

    Join Date
    Jan 2007
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    What mags do you have? Slicks are natorious for having intermittent starting problems. I dumped mine for a set of Bendix and have been very happy. If you have Bendix mags send them to https://www.aircraftmagnetoservice.n...hoC5gMQAvD_BwE for rebuild/overhaul, they are great people to work with.
    Likes G44 liked this post

  6. #6
    skywagon8a's Avatar
    Join Date
    Mar 2008
    SE Mass
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    Mags have ignition points like old cars. Over time the points and the follower wear a little. This changes the internal timing of the mag. If the points are in otherwise good condition just retime them to E-gap (the point of the highest magnetic flux prior to TDC) of the rotating magnet. You feel E-gap with your hands. All it takes is a 1/2" wrench, a screw driver, a piece of paper and a few minutes of time.
    Likes mike mcs repair, DENNY liked this post

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