Original pipes that blued on a Japanese bike, means it is running way to hot. Japanese header pipes are double walled to prevent that. Yes, aftermarket headers will blue, but not original pipes. There is no copper on either British or Japanese original pipes, unless they have been replated. Copper being softer than either nickel or chrome can be used as a base when re-plating, to fill pits and imperfections in the pipes. This is what you find in used old pipes that have been replated. Assembly line pipes did not get copper because there was no pits on the new pipes and also to keep costs down. I forget at what temp. chrome blues, but if your pipes on a Japanese bike are bluing, I would clean them carbs. and also check timing. Maybe someone changed main jets at one time or if you are running lean due to no air cleaner that can be the cause as well. If a British bike does not have blued pipes, it is because it hasn't been run hard or long enough.Almost all assy. line chrome is double plate, that is nickel followed by chrome. Triple plate is for restorers and custom work. The triple plate is copper, than nickel followed by chrome. The copper coat will get polished before the nickel plate to give that real deep look.
I have an old bottle of "Blue Away" from the '60's. It will scratch your chrome. As far as I am concerned, you might as well reach under the kitchen sink and use "Comet" on it.
