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! #motorcycles source