Bob,
Here is a chart from a slide presentation on Ogura's web site -- note that the nominal 0.018 used so often on this site is pretty much conservatively toward the center of the lower half of each range, allowing for some wear and still continue to function...
Too tight an adjustment can cause drag and accelerated wear, but it is the heat generated (wihch can cause coil failure) that is the biggest reason to not set the gap too small.
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Chuck
Here is a chart from a slide presentation on Ogura's web site -- note that the nominal 0.018 used so often on this site is pretty much conservatively toward the center of the lower half of each range, allowing for some wear and still continue to function...
Too tight an adjustment can cause drag and accelerated wear, but it is the heat generated (wihch can cause coil failure) that is the biggest reason to not set the gap too small.
Chuck
