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blue pipes

  1. Engine, Carburetor, Fuel System & Exhaust
    Its a fairly new 07 rebel 250. with almost 1000 miles on it i got it when it had around 800 miles. since then one of the pipes has been bluing and the other one is not. is this normal? i feel like they should do the same thing either both blue or both dont blue. i felt the side of the engine and...