Keep running the engine until it turns straw colored and eventually brown. The color change is a property of the material's reaction to heat. There isn't anything practical to do about it except get a different exhaust and that with have its characteristic color pattern. There is no double wall exhaust available. The surface can be polished back to its original color by removing the microscopic colored layer using the mild abrasive in the polish. Heat the metal again and the process will happen again though.
The fiist and only day I rode my adv.bike, I rode it 550 miles. The blue exhaust pipe looked like it was on a motor that had 50 thousand miles on it. We were amazed hot the pipe turned blue. When I ride my bike to the dealer on Tues. for my 600 mile check, it will be noted about my concern. Later next week I will put another 2500 miles on it going to and from Phoenix. HB
If you must have clean pipe, Bar Keepers Friend, a stainless cleaning powder does a good job.
another way was to spray a heat retardant paint down the inside of the pipe. I did that with my Kerkers back in the 70's.
Some of the exotic Italian bikes look they come off the assembly line with various shades of amber and blue on the pipes. I think it kind of looks cool myself. Most bikes don't even have chrome pipes anymore do they?
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