BMW reccommend that the engine not be run stationary for a long time, I forget the figures, having sold my r80 no longer have the book. but it was either 2 minutes or ten.
as an aside, french BMW r1150's have a thermostat on the oil with a fan cooled oil cooler.
but yes, air cooled bike heat up when stopped.. My Enfield (lean burn) is the hottest bike I have ever come across.
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