About a week after getting the bike running, the starter motor blew up.
Well, not literally blown up – it just make a horrid clunking sound instead of turning over. I took it out of its housing, and discovered that the permanent magnets had come loose, and were rattling around in the casing. Most undignified – bits had chipped off and the whole thing inside was a mess of dirt, rust, and magnet fragments.
I took everything apart and cleaned and polished whatever I could find.
I couldn’t figure how to glue the magnets in place, so I decided to build a couple of packer pieces using a heat-resistant epoxy putty. It’s lasted for over 4 years so far – I guess it worked.
Everything went back together OK. A dollop of grease finished the job.
Davo's Weekend Workshop 
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