orange"ish" head pipes

[skids]

Two xs11's with Jardine 4 into 1 exhaust systems.

I started all of the bikes in the garage last night. After they warmed-up I locked the throttles of the two xs11's at 3Krpms. From the head to a little beyond the curves, they had a slight orange appearance. I know it is different when the bike is not under load, but is this "normal?"

[Rasputin]

All of my Jardine's have a sleeve that is roughly 2 1/2 inches long. These keep the exhaust from overly heating for the first couple of inches. If you did not have a fan blowing over the motor and exhaust while locked at that Rpm then it may have got a bit warmer than one would normally see.
If the coloring was just beyond the sleeves with no air movement then I can see it happening, but I have never had this happen with any of my bikes. Maybe I just never noticed it or did it when it was dark enough to see but I think if you were riding it or had a fan you would not have seen the color. Of course this is assuming the bike was running well before.

[CKlamer]

+1 on the above.
The bikes are air cooled no air no cooling.
I have a 1981 CB750K with a race engine and even with fans blowing it doesn't take long to get into the 350 degree range on the dyno pretty quick.

My exhaust is ceramic coated so that won't happen with mine it keeps all that heat in the exhaust.

I wouldn't do that for any length of time it's a good way to shorten the life of your engine.