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That's an indicator that you should be paying attention to. Blueing pipes means heat. A lean condition or exhaust valve out of adjustment or bad can make it hotter. Before worrying about cleaning, and yes you can do a degree, I would concern myself to find out why they are discoloring.
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Comments contained in my posts are not intended to cause physical or psychological stress and are mearly my two cents worth, and in this economy, that's cheap!
87 CMX250C 'the Pygmy Pony'
87 CMX450C 'Black Lithium'
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