Head Pipe Temp to Hot?

I just changed the WR valve timing to YZ. I started it without any jetting changes. The head pipe got very hot in less than a minute, it seemed to glow slightly red. What can cause the pipe to get so hot?

Jerry

Actually they glow red hot either way...was it at night? The first night I got my bike I started it at night and it was glowing red hot...Its normal..

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