I have an 07 zzr 600. had the same problem. change your spark plugs and adjust the carbs. i know it sounds crazy but the carbs being a tad rich will cause the overheating issues.
Try blowing the radiator out from the engine side with compressed air to get rid of bugs and other debris. Make sure the fan comes on when it's hot. Check the filler cap seal to make sure it is building pressure in the cooling system. Worst case is leaking combustion products getting into the cooling system through a leaking head gasket or similar. There is a chemical test available that checks for that problem. Hope this helps!
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