Compression Test Question

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Anonymous
    #1

    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.
    Tags: None
    • hoyterb
      #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.

        Comment

        • Jethro
          Forum LongTimer
          Charter Member
          GSResource Superstar
          Past Site Supporter
          • May 2002
          • 17888
          • The only Henniker on earth
          #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

            Comment

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

                Comment

                • Jethro
                  Forum LongTimer
                  Charter Member
                  GSResource Superstar
                  Past Site Supporter
                  • May 2002
                  • 17888
                  • The only Henniker on earth
                  #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

                    • Anonymous
                      #6
                      Pull all the plugs.

                        Comment

                        Previous template Next
                        Working...