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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Magneto Problem
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<blockquote data-quote="Kansas Bad Man" data-source="post: 51127" data-attributes="member: 778"><p>After reading Kens link, it is apparent that I have misinformed the readers of my post. Both Ken and the other guy who are the magneto experts say that to spark the magneto HT LEAD to ground may and does cause damage to the magneto. I have repaired many magnetos over the years and my procedures are in almost all respect the same as the very well written service procedures by Ken. Having sad that, my saying about atmosphere spark testing is a fact. Always, after I have performed a magneto overhaul , I put the mag in a vice and spine the magneto with a 3/4 inch variable speed drill in direction of magneto rotation. Most drill motors are of the 3000 RPM variety which would test the magneto at a engine RPM of 6000. My test is with sparkplugs at first, both plugs grounded to magneto housing. the next test is with the HT leads removed a set of Honda sparkplug leads with low resistor plug ends a test is made to see if a adequate spark to ground can be obtained, this will insure that the plug will fire in real life. This is a short duration test, and I have yet to hurt any magneto in any way over the years using that test procedures. Call me lucky I guess. I would only add to Kens overview is a paragraph on the checking and repair of a 50 degree cam ring of a Vincent that is say 46 or 47 degrees.</p></blockquote><p></p>
[QUOTE="Kansas Bad Man, post: 51127, member: 778"] After reading Kens link, it is apparent that I have misinformed the readers of my post. Both Ken and the other guy who are the magneto experts say that to spark the magneto HT LEAD to ground may and does cause damage to the magneto. I have repaired many magnetos over the years and my procedures are in almost all respect the same as the very well written service procedures by Ken. Having sad that, my saying about atmosphere spark testing is a fact. Always, after I have performed a magneto overhaul , I put the mag in a vice and spine the magneto with a 3/4 inch variable speed drill in direction of magneto rotation. Most drill motors are of the 3000 RPM variety which would test the magneto at a engine RPM of 6000. My test is with sparkplugs at first, both plugs grounded to magneto housing. the next test is with the HT leads removed a set of Honda sparkplug leads with low resistor plug ends a test is made to see if a adequate spark to ground can be obtained, this will insure that the plug will fire in real life. This is a short duration test, and I have yet to hurt any magneto in any way over the years using that test procedures. Call me lucky I guess. I would only add to Kens overview is a paragraph on the checking and repair of a 50 degree cam ring of a Vincent that is say 46 or 47 degrees. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Magneto Problem
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