Are these ok compression numbers?

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  • DimitriT
    Forum Guru
    Past Site Supporter
    • Sep 2005
    • 9897
    • USA
    #1

    Are these ok compression numbers?

    1982 GS550LZ

    Cyl#1 135
    Cyl#2 128
    Cyl#3 130
    Cyl#4 130

    Cold and dry numbers.

    Bike has 60k miles but the head is a bit younger (maybe 40k) and the sleeves were replaced about 20k ago (did not hone or replace rings at that time).

    Bike runs fine but needs a little gulp of extra air with choke to start cold.

    Also I am looking for shims on the thinner end (2.55 to 2.60). Can someone point me to a source please.
    Tags: None
    • Nessism
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Mar 2006
      • 35805
      • Torrance, CA
      #2
      Z1 has shims for $6/each.

      Your compression numbers are okay. Proper test method is hot engine and throttle held open.

      BTW, once you figure out what specific shims you need, PM me, and I'll check my stash.
      Last edited by Nessism; 12-23-2025, 02:17 PM.
      Ed

      To measure is to know.

      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

        Comment

        • Rob S.
          Forum Guru
          Past Site Supporter
          • Dec 2013
          • 9452
          • New York City
          #3
          Your bike is supposed to need the choke to start (cold). And Suzukis are notoriously finicky on cold start up, prompting Cycle World to celebrate when the choke control was moved to the left thumb.
          1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

          2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

            Comment

            • DimitriT
              Forum Guru
              Past Site Supporter
              • Sep 2005
              • 9897
              • USA
              #4
              Originally posted by Rob S.
              Your bike is supposed to need the choke to start (cold). And Suzukis are notoriously finicky on cold start up, prompting Cycle World to celebrate when the choke control was moved to the left thumb.
              In my case I find that if I add choke and crack the throttle for a split second while cranking it, it will start strong every time. It seems to like a little extra air in that starting crank. Probably to help with compression.

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