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Send it to Dave Lindsley. Be aware that magnetos do NOT last forever (a friend who races in the Manx Grand Prix has his overhauled EVERY year, my experience is that my mag, a 2MTT on a Manx Norton began to fail every three years) and that the condensor/capacitor is usually the problem. Note that racing mags are run FAR hotter than road mags, so multiplying the times above by three is probably realistic.
Why would race mags run faster ? Don't all mags on a 4 stroke engine run at half engine speed ?
Aviation mags have their own hard life , vibration , duty cycle and heat. They are typically out of the airstream as in wet weather that airstream is err , wet !!