So ive seen this on more than one bike and want to know what causes this. The headers will start to turn to a deep blue after being on the bike for a while right next to the block. What does this mean when that happens?

 

I think its called bluing.. maybe some other terms to describe it. It is normal. from the heat of the exhaust gasses. You can put products on your pipes to lessen it. You can also get them ceramic coated and then you will never get burned on your headers...

 

I think it happens if the bike is running lean, which makes the exhaust hotter.

 

heat does it.

 

hahha "i think its called bluing"

nice and simple

 

I have seen brake rotors on cars do that too. Bluing.

 

i thought you were gonna say rotors on bikes.. a car okay, but if i saw my rotors like that i would ****...

I thought there might be another word for it..

 

It is not ok on cars either. Those people are the brake slammers and brake riders.

 

So it has nothing to do with performance headers? (buddy told me that thought he was blowing smoke)

 

Correct me if I'm remembering wrong, but it happens when metal gets too hot. (I've had a little experience with this using a grinder on metal ) If I remember correctly, it results in a weaker (more brittle) metal. So its very bad on something suck as a brake rotor or bike's frame, not such a big deal on a header/exhaust pipe.