The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Ian on 18.01. 2016 23:11
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I was fettling my A10 when it suddenly developed a misfire on one barrel. Prior knowledge made me suspect the magneto carbon brush which on inspection had come adrift from the holder.
So I replaced the missing brush but the misfire persists. Could the missing brush be causing a short of some kind. Any ideas how to remove the brush without dismantling the mag from the engine?
All help gratefully accepted
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Remove both pickups and blow it out by firing air in through one of the pickup windows. If you haven't got an airline you can try blowing it out with a rubber tube or pushing a tube in and sucking but make sure you use a tube which is smaller than the brush or you could choke. Check your slip ring for carbon traces and clean it with some fine emery on the end of a rubber tube pushed in one of the pickup windows. Make sure you are not using poor brushes - rub them on some white paper to see if they make lines like a pencil; if they do, bin 'em.
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Beezermacc
Many thanks for the swift reply and helpful tips,
Ian *smile*
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If you removed he pick up holder and there was no brush in it then yes.
There is a big lump of conductive material sitting on or near the slip ring shorting it out to the magneto case
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Bsa_54A10
Cheers for the advice, blew mag threw with air compressor engine started first time *smile*