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My 05 Thruxton is blue and gold, looks like she has been run for 15k miles, which it has.
My 76 Bonnie is blue as well, so I am sure she has had her share of flogging.
My 05 Bonnie has no blue with a hint of gold, the problem with her is there is absolutely no chrome left on the pipes. That's the way she came to me last year at 1500 miles, and now has almost 6k miles. Except for being very cold natured, I believe the jetting is spot on. Excellent power, brown plugs, and 45 to 52 mpg. Can't beat that!
 
I have done a ton of research on this topic as well as get opinions from local friends as well as members of my other site BOC. I have been informed that after they are blue and gold there is nothing that can be used to remove this color. Many have said that when the pipes are new you can use hi-temp paint like BBQ Grill paint and spray several layers on the inside of the pipe and that willkeep them from turning, but you have to do this every year or more often depending on the amount you ride. My blue/gold pipes make this solution a not on my list of things that can be done to get them back to chrome. I have found a solution. One is a process callet Jet Hot in which a highly polished silver ceramic coating is sprayed on the outside and the inside is coated as well. then it is baked on. The other is called Coolkrome. I have posted both sites below. They both are franchises and have dealers all over. They both are in the $100 - $150 range to have both pipes done. Fortunately they are both in my area. I am going to have the Jet Hot treatment done because they are 45 min. from me, whereas the Calico Coatings (Coolkrome) place is 2 hours away. I hope this helps.


http://jet-hot.com/
http://www.calicocoatings.com/industries/coating-solutions/automotive-racing/
 
I have seen a couple of bikes with the Jet Hot treatment. Having grown up with Brit Twins in the 50's and 60's, I just accept the bluing. Back in the day, it was a badge of honor; it showed that you rode the bike and were not afraid to really ride it.

The only other solution other than what you mentioned above are double walled headers. Removing the air injection on the Bonnie family bikes cuts the bluing in half.
 
Head pipes should not blue if the bike is properly jetted and is rid of all the EPA restrictions. Bluing pipes is a sign of a lean fuel mixture or excessive heat, which is more than likely due to the EPA's strict air pollution/import policies. I don't know about the newer fuel injection bonnies, but if they actually have a fuel map loaded one could probably dyno the fueling to richen the mixture and get rid of pipes that blue. If one has the older carb models you could jet it accordingly and cut out most of the bluing. Either way I imagine you'd have to take off all of the EPA mandated junk and then start on the fuel map or jetting. I suppose it could also be partly due to cheap materials, chrome plating on the headers and I could be way wrong, but it should be no different than an old bike.
 
You are spot on. Many of us had the dealer remove the EPA air injection before we ever fired up the bike on the Hinckley bikes. Blue on the Meriden bikes was considered a badge of honor!
 
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