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    #1

    Best way to find air leak?

    I am the new owner of a 1982 GS1100GK. This bike is in excellent condition and was "restored" by the PO. The bike runs pretty good but stumbles a bit in different throttle positions when it's cold. Only after about an hour or so of riding does it clear up. Even then, sometimes it doesn't. It stumbles at launch (only when cold) , and at WOT (most of the time). It's fine in the middle and when cruising. Following the advice of the Top Ten Newbie Mistakes on this forum, I'm going to do a full teardown and cleaning of the carbs and document exactly what jets are installed. I know they're larger than normal but I don't know what size. Will do all of the other maintenance items as well before I start troubleshooting.

    My question is, if spraying starter fluid around the intake boots isn't a reliable method for finding air leaks, what is? When I re-install the carbs I want to make absolutely sure there are no air leaks.
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    #2
    Good idea to just go ahead and do a thorough clean like you plan. Don't take shortcuts. Follow this tutorial by Nessism.
    https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

    Good Idea to just go ahead and order a new set of o-rings from Nessism for the rebuild.
    You'll want to order new o-rings for the carb boots, the ones that seal the boots to the head. You'll have to evaluate whether the boots themselves are still pliable enough to seal. Spraying almost anything around those boots while running should reveal any leaks in that area, even water, WD-40. Doesn't have to be starting fluid. In fact, I don't think I would use starting fluid. Just my opinion. You're looking for any change in engine RPMs when you spray something around those boots.
    While you're at it, also a good idea to refurb the cam chain tensioner.
    Suzuki GS Motorcycle Illustrated Repair and Maintenance
    https://www.bwringer.com/gs/camchaintens.html


    Oh, and you ride your GK at Wide Open Throttle "most of the time"?
    Last edited by Rich82GS750TZ; 10-02-2024, 12:14 PM.
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200
    BikeCliff's / Charging System Sorted / Posting Pics
    Destroy-Rebuild 750T/ Destroy-Rebuild part deux
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      #3
      That's the tutorial I plan to follow. Will check out the cam chain tensioner link as well. Thanks for the tips!

      Oh, and you ride your GK at Wide Open Throttle "most of the time"?[/QUOTE]

      And is there any other way to ride! lol.

      What I really meant there is that most of the time, when at WOT, it will hesitate. But sometimes it doesn't which is weird that it's inconsistent.

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        #4
        I kinda thought that's what you meant. But, figured I'd bust you ba!!s about it anyway. Good luck with your project.
        Rich
        1982 GS 750TZ
        2015 Triumph Tiger 1200
        BikeCliff's / Charging System Sorted / Posting Pics
        Destroy-Rebuild 750T/ Destroy-Rebuild part deux
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          #5
          Just thinking, just for kicks, while waiting for "O" rings, run a tank of fuel with a big dose of "Seafoam" through it. Wouldn't count on fixing problem, but what if it does?... And No, I don't own stock in Seafoam.
          1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100
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            #6
            Originally posted by rphillips View Post
            Just thinking, just for kicks, while waiting for "O" rings, run a tank of fuel with a big dose of "Seafoam" through it. Wouldn't count on fixing problem, but what if it does?... And No, I don't own stock in Seafoam.
            Couldn’t hurt. I’ve always used seafoam but never been sure if it’s actually doing anything. That would be a good test!

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              #7
              Seafoam is your friend! Also, I was recently in a spot where I was getting low on gas and the only thing available was 93 octane ethanol free gasoline. At $4.75 a gallon I only bought enough to get me to a gas station but holy cow, the bike ran great after running some of that through it!
              1980 Yamaha XS1100G (Current bike)
              1982 GS450txz (former bike)
              LONG list of previous bikes not listed here.

              I identify as a man but according to the label on a box of Stauffers Baked Lasagne I'm actually a family of four
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                #8
                Originally posted by LAB3 View Post
                ...93 octane ethanol free gasoline.
                We don't have any of that here in the Big Apple.
                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.

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                  #9
                  Originally posted by Rob S. View Post

                  We don't have any of that here in the Big Apple.
                  That was at Deals Gap Motorcycle Lodge on the NC side of the Tail of the Dragon.
                  1980 Yamaha XS1100G (Current bike)
                  1982 GS450txz (former bike)
                  LONG list of previous bikes not listed here.

                  I identify as a man but according to the label on a box of Stauffers Baked Lasagne I'm actually a family of four

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                    #10
                    Originally posted by LAB3 View Post
                    Seafoam is your friend! Also, I was recently in a spot where I was getting low on gas and the only thing available was 93 octane ethanol free gasoline. At $4.75 a gallon I only bought enough to get me to a gas station but holy cow, the bike ran great after running some of that through it!
                    Huh.. I read that higher octane doesn’t make any real difference. Maybe the ethanol free is what did it? I just filled up with ethanol free. So we’ll see!

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                      #11
                      Originally posted by danny01975 View Post

                      Huh.. I read that higher octane doesn’t make any real difference. Maybe the ethanol free is what did it? I just filled up with ethanol free. So we’ll see!
                      Higher octane won't make a difference if the engine isn't built to take advantage of it. However, it's perfectly possible the OP filled up with something decent from a Top Tier brand. I certainly notice when I'm using Texaco, compared to the other crap around here.
                      ---- Dave

                      Only a dog knows why a motorcyclist sticks his head out of a car window
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