To give you an idea of how hot a head may get,my 86 Tenere,the one with the tank covering the head,has topped 232 degree celsius on my Trail Tech Vapor.
Normal trail riding (through tight forest tracks etc) its running around high 190s.The 232 was reached on a stinking hot day with very little wind in the tight forest tracks.
One thing you could check is that the carb isnt running too lean,that'll cause the bike to run quite hot.
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