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I have posted this link before but some may have missed. This is by the far the best analysis of rebuilding rotating armature type magnetos on the web.

http://www.britbike.com/forums/ubbthrea ... Post446733

Magnetos can be a real pain to get on and off. The following can help. Perhaps not suitable for concours machines but excellent for people who ride the bike. I have done all the following on my race bike.

The bottom nut is the hardest to access. BSA made a very long wasted blind threaded "bolt" to replace the lowest nut. This makes it perfectly accessible.

Also if you are not too fussy about perfect looks it is worth:

- dremmeling the mag casing around the two top nuts to give more clearance.
- machining the faces on the nuts down to the next spanner size. (leaving a step at one end of the nut so it covers the washer properly)
- slimming down a ring spanner to fit.

If you do all this you can remove the mag in 2 minutes.

<blockquote data-quote="johnm" data-source="post: 294013" data-attributes="member: 892">I have posted this link before but some may have missed. This is by the far the best analysis of rebuilding rotating armature type magnetos on the web.<a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&amp;Number=446733#Post446733" target="_blank">http://www.britbike.com/forums/ubbthrea ... Post446733</a>Magnetos can be a real pain to get on and off. The following can help. Perhaps not suitable for concours machines but excellent for people who ride the bike. I have done all the following on my race bike.The bottom nut is the hardest to access. BSA made a very long wasted blind threaded &quot;bolt&quot; to replace the lowest nut. This makes it perfectly accessible. Also if you are not too fussy about perfect looks it is worth:&nbsp;- dremmeling the mag casing around the two top nuts to give more clearance. - machining the faces on the nuts down to the next spanner size. (leaving a step at one end of the nut so it covers the washer properly)- slimming down a ring spanner to fit.If you do all this you can remove the mag in 2 minutes.</blockquote>

[QUOTE="johnm, post: 294013, member: 892"] I have posted this link before but some may have missed. This is by the far the best analysis of rebuilding rotating armature type magnetos on the web. [url=http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=446733#Post446733]http://www.britbike.com/forums/ubbthrea ... Post446733[/url] Magnetos can be a real pain to get on and off. The following can help. Perhaps not suitable for concours machines but excellent for people who ride the bike. I have done all the following on my race bike. The bottom nut is the hardest to access. BSA made a very long wasted blind threaded "bolt" to replace the lowest nut. This makes it perfectly accessible. Also if you are not too fussy about perfect looks it is worth: - dremmeling the mag casing around the two top nuts to give more clearance. - machining the faces on the nuts down to the next spanner size. (leaving a step at one end of the nut so it covers the washer properly) - slimming down a ring spanner to fit. If you do all this you can remove the mag in 2 minutes. [/QUOTE]