high rpm

  1. avemachina

    Surging engine, hanging RPMs, black spark plugs?

    Howdy again! The old boy's developed fun new issue after a cold snap kept me off two wheels for a week. Last change I made was checking my plugs and noticing they had a healthy dry black soot deposit on them, so I wire-brushed them off and adjusted my idle mix screws 1/4 turn out to help lean it...
    • avemachina
    • Thread
    • air leak black spark plugs high rpm jetting surge
    • Replies: 11
    • Forum: The Garage
  2. E

    Crazy High RPM after revving the engine

    So pretty much my bike is running fine until i rev the engine, after that the rpm's seem to go crazy high and wont go back down unless I am to pull on the choke all the way, someone want to enlighten me as to what may be happening? I have a 80' XS400G if it helps Thanks,
    • Ethan
    • Thread
    • engine help me identify high rpm rev rpm rpms
    • Replies: 5
    • Forum: The Garage
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