2007 YZ450 Exhaust question

I just bought a used 07 YZ450f and I notice that the exhaust pipe gets cherry red when I am idling. The bike is all stock and runs great. Starts first kick. Is the cherry red exhaust a sign of something wrong with the valves or jetting? Does this happen on all 4 strokes?

mine does that too. I have the 07 all stock. No problem

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