Is this engine temperature or oil temperature?
If it's engine temp, this is not a problem.
If it's oil temp, you should seriously consider changing your oil twice as often as the manufacturer recommends and also think about adding a cooler with a thermostat.
I used to run a HD service dep't, word from the factory school was that 200 degrees was OK for an oil temperature, every 20 degrees past that cut the life of the oil in half.
This was over 20 years ago, I'm sure oil has improved, nonetheless, 250 is hot for oil. I'd spend the money if it were my bike.