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I wonder if it might be a case of unequal expansion and contraction of the head and cylinder that might have a bearing on the head bolts coming loose. A little Loktite on the bolts may help. Just a guess from me since we never had a problem with Lynda's bike.
An air cooled engine may exceed optimal operating temps while a liquid cooled engine upper operating temp is governed by the thermostat. Food for thought.
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