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    Compression Test Question

    Do you not have to disconnect the gas when doing a compression test? I know you're supposed to do it with the throttle full open, but won't gas start shooting out the cylinders with the plugs out?

    Sorry if it's a dumb question. I'm going to be doing a compression test for the first time this week.

    #2
    No problem.Just keep the throttle WO and no fuel will come out.The air/fuel mix is a vapor.If you want to just pinch off the fuel line where it comes out of the tank.

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      #3
      What is the purpose of opening the throttle?
      Currently bikeless
      '81 GS 1100EX - "Peace, by superior fire power."
      '06 FZ1000 - "What we are dealing with here, is a COMPLETE lack of respect for the law."

      I ride, therefore I am.... constantly buying new tires.

      "Tell me what kind of an accident you are going to have, and I will tell you which helmet to wear." - Harry Hurt

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        #4
        With the throttle closed there is almost no air being pulled into the cylinder thus nothing to compress.

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          #5
          Ah! Makes sense! The compression tester I just bought had instructions telling me to unplug the ignition leads as well as pull the plugs. Seems redundant to me, am I missing something? Also, do I keep the plugs in the other cylinders that I am not testing, or pull 'em all out together?
          Currently bikeless
          '81 GS 1100EX - "Peace, by superior fire power."
          '06 FZ1000 - "What we are dealing with here, is a COMPLETE lack of respect for the law."

          I ride, therefore I am.... constantly buying new tires.

          "Tell me what kind of an accident you are going to have, and I will tell you which helmet to wear." - Harry Hurt

          Comment


            #6
            Pull all the plugs.

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