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    Compression & leakdown test

    I have a 82 GS850G with 56k on it. During my general tune up and valve check I usually do a compression check. The compression was low 115-130 PSI (supposed to range between 128-171). I'm not burning any oil,(no smoke out the exhaust) and I haven't lost any power. I checked with a local bike shop mechanic and he said he wouldn't worry about the low compression if I not seeing smoke out the exhaust he did suggest a leak down test. What is an acceptable psi loss in a leak down test. I did 1/2 ounce of oil in the cylinders and the compression raised 20 PSI. Any suggestions would be great. Thanks. Bob Shaw

    #2
    No smoking,no increase in oil demand.- still plenty of power...... I'd skip worrying. My bike has about same mileage. I figure the valves will go first!
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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      #3
      Thanks, I don't want to get into the engine if I don't have to..

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        #4
        I have an 80 850L with 52,000 on it, not great compression but runs like a striped ape with little oil use. Run it as is.

        V
        Gustov
        80 GS 1100 LT, 83 1100 G "Scruffy"
        81 GS 1000 G
        79 GS 850 G
        81 GS 850 L
        83 GS 550 ES, 85 GS 550 ES
        80 GS 550 L
        86 450 Rebel, 70CL 70, Yamaha TTR125
        2002 Honda 919
        2004 Ural Gear up

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          #5
          Have you adjusted the valve clearances yet? If not do it.
          http://img.photobucket.com/albums/v5...tatesMap-1.jpg

          Life is too short to ride an L.

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            #6
            Thanks for your help.

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              #7
              Well, who want's to open up an engine anyway? (DIYer stampede here)
              Of course you've lost power, don't be ignorant.
              1982 GS1100G- road bike
              1990 GSX750F-(1127cc '92 GSXR engine)
              1987 Honda CBR600F Hurricane

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                #8
                Warm up the bike and then do a compression test, if you pour in oil you will screw up the test result.
                Pouring in some oil is a way of testing worn piston rings, in your case: changing piston rings will probably help gain some power and compression back.

                If you don't need/use the power leave it as is like all the others are saying here

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                  #9
                  Did the compression come up after you adjusted the valve clearances?
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

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                    #10
                    Compression stayed the same. It only increased after I put half an ounce of oil in the cylinders. Rings may be worn but as I said I haven't lost power and I'm not burning oil. I'll leave it alone. Thanks again...

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