Header bluing

[Clawdog60]

I’m noticing the headers are not discoloring evenly near the head. Is this normal on these motors? Shouldn’t be.

 

[Dogdaze]

Normal, uneven due to the length of the header pipes I believe, one being slightly shorter will create a marginal amount of more back pressure and so heat. Don't waste your time or energy trying to clean them up, will last about a week maybe less and it's back. Spend the time riding.

 

[Don in Lodi]

Technician hand prints. If the exhaust isn't wiped down with alcohol or something before the first run-in the oils left behind turn the metal a different color. I could actually make out four fingers and a thumb print on mine.

 

[Clawdog60]

Normal, uneven due to the length of the header pipes I believe, one being slightly shorter will create a marginal amount of more back pressure and so heat. Don't waste your time or energy trying to clean them up, will last about a week maybe less and it's back. Spend the time riding.

Thanks. I told my servicing dealer about it (first service) said they would send a note to Yamaha. He suspected a response of NORMAL from them if any.

 

[Clawdog60]

Technician hand prints. If the exhaust isn't wiped down with alcohol or something before the first run-in the oils left behind turn the metal a different color. I could actually make out four fingers and a thumb print on mine.

Im not seeing any fingerprints or such just typical bluing. I just thought it should be closer to an even amount between the 2. Seems to run fine. No stalling. Slight pop on down shift sometimes. A couple of hot hard starts.

 

[Checkswrecks]

The headers on this bike are stainless and get pretty ugly. First blue and then dark grey.
They do polish back to blue with a lot of effort but won't stay that way long.

 

[Sierra1]

I always liked the "cans" on the ST1300. They were stainless, and over time, turned a cool shade of bonze/gold.

 

[EricV]

I just thought it should be closer to an even amount between the 2.

Just curious, why do you think they should be even?

It's really pretty rare for different cylinders on multi-cylinder engines to run the same exhaust temp. Add in the cat/con and exhaust routing, just more reasons for some variation. A really dramatic difference might indicate something was up, but with EFI that's pretty rare.

 

[WJBertrand]

Normal, uneven due to the length of the header pipes I believe, one being slightly shorter will create a marginal amount of more back pressure and so heat. Don't waste your time or energy trying to clean them up, will last about a week maybe less and it's back. Spend the time riding.

Fluid dynamics would predict the longer header would cause more back pressure, assuming both of the header pipes have the same inside diameter

 

[Checkswrecks]

There's also the issue that one picks up more contamination from the front tire. Rain or any other water coming up off the street especially has a lot of chemicals.

 

[SkunkWorks]

While you are riding, one header pipe might receive more air-flow coming off the front wheel assembly, causing it to run cooler in the wind.
This would cause a difference in color also.

 

[Clawdog60]

Just curious, why do you think they should be even?

It's really pretty rare for different cylinders on multi-cylinder engines to run the same exhaust temp. Add in the cat/con and exhaust routing, just more reasons for some variation. A really dramatic difference might indicate something was up, but with EFI that's pretty rare.

I’ll buy into the difference in bluing but not temperature difference within 2” of the head outlet .

 

[Clawdog60]

Fluid dynamics would predict the longer header would cause more back pressure, assuming both of the header pipes have the same inside diameter

S10 headers are not equal length?

 

[EricV]

S10 headers are not equal length?

Not exactly. Think in terms of flow from the head to the cat insert. Cylinder head temp is usually measured at the exhaust manifold/port. I've seen some significant differences on autos. Never put probes in a moto exhaust though.

 

[Travex]

It lends character.

 

[Nikolajsen]

This is my 2017 Euro4, after 13458 km. (no polish done, only wash)

 

[Clawdog60]

Would be nice to see some header pics after a premium ECU tune.

 

[Jlq1969]

I use car polish without wax

 

[Stridey]

I use car polish without waxView attachment 51401View attachment 51402View attachment 51403

Wow! Like a mirror!
Mine were never like that even when new from what I can recall.
I’m not a polisher but sometimes I wish I was!


Sent from my iPhone using Tapatalk

 

[Travex]

Those pics are disgusting... There's not a speck of dirt on that machine -Nice job Jlq1969!