vacuum leak

  1. Winnipeg_79_XS400

    Over raving/vacuum leak

    1979 xs400F So I am now TRYING to get the carbs sync. Once I let the bike idle/warm up and shut off the choke, the bike takes off/over rev's. New battery-good charge New coils-Both primary's and secondary's checked out on install. Going to chack again Electronic Ignition! Valve spacing has...
    • Winnipeg_79_XS400
    • Thread
    • carb bogging carb setup carb sync carb tuning rebuild vacuum leak
    • Replies: 23
    • Forum: The Garage
  2. N

    1977 XS400 vacuum leak?

    Hi, everyone. As the name states, I'm new to this forum and to motorcycles in general. Bought a 77 xs400 about a month ago and it started acting up once I brought it home. From what I've read, the symptoms seem to point to a vacuum leak (hard start, inconsistent idle that will often slow until...
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