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M21 No Spark


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As per title, really.

BSA started fine when I first got it a coupla months ago. Started (after a lot of huffing, puffing and swearing) a few weeks back too.

But now it won't start at all. Changed the battery and the spark plugs, but it's not sparking at all.

Before I go the whole hog and send the Magneto off for a rewind, what checks should I do first? If it's something simple, that'd save time and money.

Cheers! Gaz

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Just found this Gaz......not from a BSA....but it'll be similar and may give you some things to check..... :wink:

http://archives.jampot.dk/Technical/Ele ... eibert.pdf


That document is the one I used to refurbish both my AJS and Matchless mags - Complete strip and rebuild - as new!

The only issue I had was the text did not mention how to deal with carbon build-up in the armature winding itself. I 'sorted' that by using a strong vacuum cleaner followed by immersing in a sonic bath.


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