Fuel, to some extent, is used to cool the engine. If you are running lean, you are generating a lot of heat. Try doing the 230 Carb and airbox Mods on your 250. See if changing to a bigger jet and tuning the fuel flow, and giving her more air helps cool her down? Of course, letting the head and cylinder fins get packed with mud is not good either LOL
Header Pipe turning to red color is not good. It might be a symptom that the bike/car is running lean and need to have your V&H Fuel controller re calibrated. You could try synthetic oil for cooler engine temp.
I have hear this before many time. exaust system does nothing but the engine It just transfers fumes out of the motor and keeps the hp up. According to my knowledge Header and exhaust pipe seems fine.don’t worry..
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