The "scratch lines" I think are also much like where the blue tint thing, is coming from the heat generated. I think these things naturally happen when they get that hot, it gets the "burnt look"
The blue tint looks cool. I can't say for sure if it's a lean mixture. It reminds me of those titanium tips on car exhaust. The scratch line looks more like debris kicked up from the the road and got burnt from the heat of the exhaust. Did you ride somewhere with a lot of debris? Try washing it off.
I don't really mind about the bluish tint. but i do worried the reason why it is there in the 1st place.
Sometimes, after a hard ride there is a burning smell coming from the engine.
I will ask the hq dealers/service centre asap which is not in the near future since they are about 330 kms away and open only on weekdays.
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Kawasaki Z650
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