Red cherry exhuast!

Working on my 1978 kz650, I noticed that the inside of my exhaust super red inside. Its was running for a good 4-5min that I noticed the inside was getting super hot. I cant tell from the outside of the header because I have an exhaust wrap. It has a welded ducati exhaust 

The wrap will retain heat in the exhaust but that still seems excessive ?

I wish I took a picture, it was GLOWING! Reading up saying bike might be running lean? Hopefully a nice carb clean will fix it

I'm not sure if this applies, but NEVER let your bike run, parked, for more than a couple of minutes, unless you have air blowing over the engine.  Not only does the exhaust overheat, the engine proper does also.  

Thank you! I was just trying to adjust the rpm idle and play with the choke. do you think its safe to plug a fan right in front of it?

Balut wrote:

Thank you! I was just trying to adjust the rpm idle and play with the choke. do you think its safe to plug a fan right in front of it?
 

Its safe as long as your feet are not in 1/2" of water.