Are you saying you can't get a 3/8 rod past the weld on your header pipe from the silencer end? Is this bike here in the states or elsewhere.Just took the silencers off , and yes definately cats in the tubes where the welds are on my 09 efi .
No penetration could be achieved with a 10mm rod at the weld point .
This should be easy enougth to spike out ?? whats everyones opinions on this??
My headers are blued in a similar position, however buckshots look to be more influenced by the high temps he has encountered if you take into account the heat pattern right down to the second bend. The heat pattern on mine is straw/light blue up to first bend and then clean until the pre cat location and the strong blueing which is very local to the cat.A few yet unanswered questions Mike as you know. The weld seam under the engine is a clear departure in header mfg. practice compared to all preceding carbed years which were mandrel bent tubing in one piece. It could be speculated that the new pipes might be slightly larger to compensate for the screen door effect of the pre-cats...or this would make sense and the only reason to add an expensive welding operation to the production of the headers IMHO. What is difficult to fathom would be the manufacturing process for chroming the headers which would be preceeded by welding in the pre-cat. Most sport bikes that have pre-cats in the headers are unplated or preplated steel that gets covered by a fairing. Chroming as most know is invasive and requires dunking the header into a cathodic bath which would destroy the pre-cat unless there was almost a hermetic seal on each end of the header pipe. Maybe this can be accomplished successfully without tainting the honeycomb cross-section of the pre-cat but would add clear difficulty. Finish drilling and tapping of the O2 sensor bung would be no problem after chroming however...bung being welded in place prior to chrome and the bung would seal off the header for dipping at the sensor without a drilled hole. Tapping after chrome is best for thread engagement.
Below is a picture of Buckshot's Texas bike which shows more bluing on an EFI bike than I have ever seen. The bike shows AI injection intact and if you look close a localized band of discoloration just before the weld seam. It would be interesting to compare this discoloration at the seam with the position of Phil's discolored section. If it matchs...maybe an argument that a pre-cat bike made its way to the US.
In any event, I am uncertain if my US bike has pre-cats but based upon all the input from those I respect, I suspect it does not.
We are learning about the new bonnies together,
Buckshot's Texas bike below: