wet method?

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  • mvalenti
    Forum Mentor
    • Nov 2009
    • 748
    • Haverhill, MA
    #1

    wet method?

    What is the wet method for checking compression? Is it as simple as ading some oil to the piston chamber?
    -Mark
    Boston, MA
    Suck Squeeze Bang Blow..
    sigpic
    1980 GS850G with 79 carbs.....
    Tags: None
    • tkent02
      Forum LongTimer
      Past Site Supporter
      • Jan 2006
      • 35571
      • Near South Park
      #2
      Yes, it will slow ring leakage, but do nothing for bad valves, so you can tell which you have.
      http://img.photobucket.com/albums/v5...tatesMap-1.jpg

      Life is too short to ride an L.

        Comment

        • bbjumper
          #3
          That's correct, if you have low compression it can point you in the right direction such as rings or valves. IMO it's of little use though, if the compression is below limits on a hot, dry cylinder your still going to need to correct the problem.

            Comment

            • MisterCinders
              #4
              Originally posted by bbjumper
              That's correct, if you have low compression it can point you in the right direction such as rings or valves. IMO it's of little use though, if the compression is below limits on a hot, dry cylinder your still going to need to correct the problem.
              Nice to know whether you'll need to pull the jugs or just the head.

                Comment

                • Dogma
                  Forum Guru
                  • Sep 2007
                  • 7143
                  • Mason, OH (SW)
                  #5
                  Originally posted by MisterCinders
                  Nice to know whether you'll need to pull the jugs or just the head.
                  Pulling just the head is risky. There's a good change the base gasket will be disturbed, leading to a leak soon after you put everything back together.
                  Dogma
                  --
                  O LORD, be gracious to me; heal me, for I have sinned against you! - David

                  Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan
                  --
                   '80 GS850 GLT
                  '80 GS1000 GT
                  '01 ZRX1200R

                  How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

                    Comment

                    • bbjumper
                      #6
                      Originally posted by Dogma
                      Pulling just the head is risky. There's a good change the base gasket will be disturbed, leading to a leak soon after you put everything back together.
                      +1 Only thing worse than having to do this job is doing it twice.

                        Comment

                        • mvalenti
                          Forum Mentor
                          • Nov 2009
                          • 748
                          • Haverhill, MA
                          #7
                          Why wouldn't you replace the head gasket to be on the safe side?
                          -Mark
                          Boston, MA
                          Suck Squeeze Bang Blow..
                          sigpic
                          1980 GS850G with 79 carbs.....

                            Comment

                            • bbjumper
                              #8
                              Originally posted by mvalenti
                              Why wouldn't you replace the head gasket to be on the safe side?
                              I would, both

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