Clawdog60
Well-Known Member
I’m noticing the headers are not discoloring evenly near the head. Is this normal on these motors? Shouldn’t be.
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.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.
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.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.
Just curious, why do you think they should be even?I just thought it should be closer to an even amount between the 2.
Fluid dynamics would predict the longer header would cause more back pressure, assuming both of the header pipes have the same inside diameterNormal, 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.
I’ll buy into the difference in bluing but not temperature difference within 2” of the head outlet .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.
S10 headers are not equal length?Fluid dynamics would predict the longer header would cause more back pressure, assuming both of the header pipes have the same inside diameter
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.S10 headers are not equal length?
Wow! Like a mirror!