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Jun 3, 2021 | 02:17 AM
#2
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Joined: Oct 2013
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From: Lancaster England
Like all air cooled engines (except two strokes) a bit of both. Air cools the cylinder, hence the fins, but the oil absorbs some of the heat from the cylinder head and the oil is then cooled by the oil cooler. Very few engines are truly oil cooled.
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