I just got through repairing a Legacy American Flyer Challenger. For the same problem of skipping chuffs. And to replace the chuff switch. They don't last forever and wear out. It is true, the micro switch starts the first chuff, and the other 3 chuffs fallow automatically. The switch is closed once and chuff, chuff, chuff, CHUFF. It does take careful adjusting with 4 lobe cams. So at least some Legacy engines use this method.
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