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cool head

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  • cool head

    I recently replaced myold stock exhaust with a Mac 4 into 2 and have noticed that 3 of the pipes have turned blue from heat but #4 has not but it is firing. What would cause this. I only noticed this because old pipes were rusty.

  • #2
    probably a lean condition on the 3 that blued
    79 xs1100 standard
    76 kz900 <now 1015
    Terry Meyer

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