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Tech. Advice: Firefly Engines
Firefly Magnets
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<blockquote data-quote="billirwinnz" data-source="post: 177322" data-attributes="member: 1697"><p>After 5 years of searching I finally found a good original firefly coil but still no spark and only 1v AC coming off the alternator despite re-magnetising the individual alnico magnets.</p><p></p><p>In desperation after re-testing the stator I called an electrical engineer friend. He said that the only way to magnetise a flywheel is to do it in-situ because, as soon as the magnets are removed from the magnetiser, they lose a lot of their strength. I decided to replace them with epoxied in 10mm cube neodymium magnets arranged in pairs with poles NN and SS around the outside. When checking with a compass the needle flips as it passes over each pair.</p><p></p><p>Spinning with my drill I got 3v AC so I connected the coil and wonder of wonders it began sparking! Now my bike is 100% original.</p><p></p><p>Cheers Bill</p></blockquote><p></p>
[QUOTE="billirwinnz, post: 177322, member: 1697"] After 5 years of searching I finally found a good original firefly coil but still no spark and only 1v AC coming off the alternator despite re-magnetising the individual alnico magnets. In desperation after re-testing the stator I called an electrical engineer friend. He said that the only way to magnetise a flywheel is to do it in-situ because, as soon as the magnets are removed from the magnetiser, they lose a lot of their strength. I decided to replace them with epoxied in 10mm cube neodymium magnets arranged in pairs with poles NN and SS around the outside. When checking with a compass the needle flips as it passes over each pair. Spinning with my drill I got 3v AC so I connected the coil and wonder of wonders it began sparking! Now my bike is 100% original. Cheers Bill [/QUOTE]
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Tech. Advice: Firefly Engines
Firefly Magnets
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