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  1. J

    Front Master Cylinder Replacement

    Wanna know the sizes of the bore and thread size so I can get a replacement. I heard 14mm with a 5/8 is the oem size but not certain. On my original MC it says 5/8 on the bottom. My bike is a 1975 Yamaha xs650
  2. J

    Missfire/backfire on right muffler

    Just recently bought a 1975 Yamaha xs650 that was sitting for sometime to assume. I cleaned the carb and out new plugs in. The old plugs were horrible with black carbon covering them probably from running too rich. No matter how I've tuned it stalls and won't run smooth and needs alot of help!
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