Announcement

Collapse
No announcement yet.

GS1000 '78 top end noise when warm

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

    GS1000 '78 top end noise when warm

    Hello GSResources Forum!

    We have been working on a Suzuki GS1000 and it's finally ready to be driven around!
    What we've noticed after a drive, was there would be a tapping/flippering noise when the engine is warm. It seems to be coming from the top left of the engine.

    The carbs are cleaned/synced, valves have been adjusted, compression is tested, all cilinders have spark, the contact breakers have been set (timing+gap).

    We're just not sure what the noice could be when it's warm (and if it's worrisome)! Do you guys have any ideas for things to check or what it could be?
    It sounds a bit like a valve, but since they have been adjusted I wouldn't suspect them to be an issue.

    Noise when warm: https://youtube.com/shorts/BRmQiqLNqyU

    Noise when cooled of a bit: https://youtube.com/shorts/pNREmZnSysM
    (You can still hear the sound, just a lot less)

    Thanks in advance!

    Regards,
    Timon
    Tags: None
    #2
    Sounds like an exhaust gasket leak to me. run a lighter flame or cigarette smoke around the pipes. if its leaking youll see it
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.
    • Likes 1

    Comment

      #3
      Agree with the exhaust leak. Did you install new crush gaskets?

      Installing an exhaust can be tricky with these old bikes. It's important to use new crush gaskets, and don't tighten up the header bolts unless the muffler hanger bolts are loose. The idea is to pull the header pipes into the exhaust ports evenly, a little at a time, working across the bank. The entire exhaust system will move backwards when the bolts are tightened, thus the need to tighten the muffler bolts last in the process.
      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
      • Likes 2

      Comment

        #4
        Thanks for your take guys! We had a exhaust leak for sure on cilinder nr2, but we just replaced the gasket for another new one, so I thought that was solved. Probably not then!

        The exhaust isn’t original and the flanges not in great shape. Just happy it probably isn’t too bad!

        thanks again

        Comment

          #5
          How about some pics of the whole bike and the story behind it?
          2@ \'78 GS1000

          Comment

            #6
            Just something I've got into before. Pieces of old baked in gaskets can be camouflaged in the back of the exhaust port. Same color and texture as the alum. Be sure "all" is cleaned out good.
            1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

            Comment

              #7
              Originally posted by rphillips View Post
              Just something I've got into before. Pieces of old baked in gaskets can be camouflaged in the back of the exhaust port. Same color and texture as the alum. Be sure "all" is cleaned out good.
              Interesting, I double checked this, but luckily it was clean.

              The probleem seems to be the weird spacers the previous owner made. They are a bit crooked and bent, making them turn a bit into the clamp. That way the exhaust doesn't crush the gaskets!

              IMG_1930.jpg

              Comment

                #8
                Originally posted by steve murdoch View Post
                How about some pics of the whole bike and the story behind it?
                The bike is a '78 GS1000, we're rebuilding for a friend. It was in pretty bad shape when we got it, so we pulled it apart.
                After a few years it's finally close to done!

                gs1000_osr8694.jpg

                Comment

                Previous template Next
                Working...
                X