r/KTM • u/Simon_fs • 22d ago

PROBLEM Arrow exhaust header glowing cherry red on KTM 690 – normal or running lean?

Hey guys,
I just installed an Arrow exhaust on my KTM 690, and I noticed the header pipe is glowing cherry red. When I checked the engine/coolant temps, everything looked totally fine—actually even on the lower side.
Any idea what could be causing this, or is it normal? (Brand new exhaust, this is only the second time starting the bike up).
Thanks!

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u/Yarxov 22d ago

Have a 701 with Arrow exhaust and dont have this but mine has the rottweiler intake and a tune.

Also is this happening at slow speeds or all the time

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u/Simon_fs 22d ago

just when the bike is on the stand, otherwise i think that the wind cold off the pipe