An alternative to a fan which has worked for me is a SRC (Summers Racing thermostat) as the Honda one can be a bit iffy, a higher rated Radiator cap, again either SRC or of a KX500, this stops it boiling sooner, (though make sure your rad hoses are in good condition) and running a water wetter type coolant which conducts the heat better.
I've run mine like this in deep sand in Morocco with no problems whereas before in standard condition the XR would boil pretty easy.
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