Old Bike, new rider, same ol' problems - 1980 GS550E

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  • NateDogg83
    Forum Newbie
    • Apr 2026
    • 2
    • Cincinnati, Ohio

    #1

    Old Bike, new rider, same ol' problems - 1980 GS550E

    Hello!

    This weekend I finally picked up my first bike, something local I had been eyeing since it looked to be in really decent condition, a 1980 GS550E with a little over 19K miles(30.5 KM).

    A nice middle aged guy had owned it for the past 13 years, putting in WAY more love to it than one would think to it, wintered it up 4 years ago and hadn't ridden it since due to his kiddos getting older, sold it to me for a very reasonable price (at around a little more than a grand) for a bike that was very clean, and still cranked but didn't run.

    After renting a U-haul sprinter van getting help from a friend, we got it loaded up in a way less sketchier way than any of us thought, and brought her home to get working on her.

    After giving it a once over with my dad (who used to own sport bikes when he was my age) it looks like I got a really nice ride.

    Pads, rotors, battery and tires were all fresh (for being 4 years old) since he replaced it all the last year he rode it. I do have a aftermarket front brake handle/rez, but included in the litany of extra parts that came with the bike is the original handle/tank that's seized up.

    He told me over the years he had he tank properly coated since he was never able to find a decent condition one anywhere, and he repainted the bike from the factory black to Ford Highland green, and put on gold Suzuki badges to pair better with the green. He also took off the stock rear view mirrors as the aftermarket clutch handle wasn't left hand thread to it aways came loose from the wind, and put on smaller square mirrors on instead.

    Other than that the bike is pretty much stock. original wheels, seat and turn signals, as well as the original gages.

    I was able to get off the carbs with not much struggle, and over the weekend i slowly worked to get it all apart and cleaned up.

    I had to get the bike out of the garage by Sunday night and back to my apartment, so I went with a Amazon carb rebuild kit as I needed new gaskets as well as new main jet filters and seats. the bike came with a a whole spare set of carbs (unracked) + misc. bits but didn't have all the parts i needed so I took what i could get with 2 day shipping.

    After waiting all day for the amazon truck, i was able to get the new float bowls, main jet seats and gaskets in and the carb back on the bike (TIL its easier to get the carbs in when you take the airbox bolts off to let it move around, who would have thought?) and to me and my dads surprise, she started right up with a couple cranks!

    Unfortunately, even after a disassembly and thorough cleaning, I am not getting fuel to cylinder 1, and inconsistent fuel to cyl 2. 3 and 4 are running fine, enough that the bike will idle and can be driven around which still made me happy.

    It was unfortunately late at that point, so my dad rode the bike over to my apartment (i only have my TIPIC, and am not allowed to ride at night yet) but all in all both me and my dad already have really great thoughts about the bike. My dad described it as so comfy it was like riding a couch compared to his GSXR 1000 he rode around on back in the day, and thinks it will be a great bike for me to ride around town and to work on. '

    Ill post up some pics of her when i get home, new to the forum to will have to figure out if i have to host the pics somewhere else.

    1980 GS550 - Highland green
  • Rich82GS750TZ
    Forum Guru
    Past Site Supporter
    Super Site Supporter
    • Jun 2018
    • 5653
    • Mifflinburg, PA / Land of Tar & Chip

    #2
    Welcome. Great story. Yes, hosting pics somewhere else is a good idea. Someplace that can give you the BBCode to copy and paste here in a post.

    I've written quite a bit about it. Click on the orange text and go to post # 6. Posting Pics

    You can also post pics directly to the forum from you phone or computer using the image icon in the reply tool bar. That usually ends up a frustrating experience for me. Size restrictions, etc. And I'm just used to doing it the other way.
    Links

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    • gtem
      Forum Mentor
      Past Site Supporter
      • May 2022
      • 157
      • Indianapolis

      #3
      Congrats on the 550! What is a "main jet seat?" As soon as I heard "amazon Carb kit" I'm quite suspicious. Did you use the jets in the kit? Sounds like you'll be taking the carbs back off. So it's idling on 3 cylinders and being ridden as such? I'd do some bench testing of the carbs with filling the bowls via the fuel inlet that feeds the whole rack, then draining the bowls to confirm whether they all have the same amount of fuel in them.
      Past GSes: '78 1000C, '79 750E, '81 1100E
      Current: '81 GS850G, '98 GSF1200S

      Comment

      • NateDogg83
        Forum Newbie
        • Apr 2026
        • 2
        • Cincinnati, Ohio

        #4
        Originally posted by gtem
        Congrats on the 550! What is a "main jet seat?" As soon as I heard "amazon Carb kit" I'm quite suspicious. Did you use the jets in the kit? Sounds like you'll be taking the carbs back off. So it's idling on 3 cylinders and being ridden as such? I'd do some bench testing of the carbs with filling the bowls via the fuel inlet that feeds the whole rack, then draining the bowls to confirm whether they all have the same amount of fuel in them.
        I'm still pretty new to carbs, main jet seat is the wrong thing, I meant the float needle seats.

        I did not use the jets in the carb kit (their 92.5s), I reused what was already in the carbs, 102 on the outer cylinders, and 110s? on the inners. Definitely pulling them again this weekend. I do know all 4 are getting fuel, as they all dripped fuel out the drain screws.

        I did need to use the amazon float needles and seats as I damaged a couple of the stock ones trying to pull them out, the o ring turned to rocks on a couple of them and I had to use vice grips to get one really stuck one out. I unfortunately shot one of the stock float needle retaining clips across my garage while taking it off and its now gone. I have spare stock seats that have the correct detent ring for the stock retaining clips, but don't have any spare clips. of course the amazon ones don't have them, and the float needles in the kit have the pin clip built into them to hold directly onto the float height adjustment tab, so i had to use the amazon seats and needles.

        In the spare carb bits box i have a set of nice C&L needles, but unless I can source another stock clip i cant use them.

        Funny enough all 3 seems to have no problems, but I kept the original needles and seats in one of the outer ones as it looked like it had already been replaced, might be source on why cylinder 1 is getting no fuel.

        I also suspect that cyl 1 slide diaphragm is sticking and not lifting to allow the carb to jet out fuel into the emulsion tube, but that's just a hunch. i remember one of the outsides ones was stickier than the other 3.

        Can i take the intake box off to see if the slides are moving while the bike is running? or will the carbs run so poorly it wont idle with the airbox off? I do 2 nice K&N dual pod filters but I don't plane to use them, not a big fan of the way they look.

        I only drove it back to my apartment from my dads garage as I had to have it out by the weekend so my dad can park his car. with the inconsistent throttle my dad doesn't want me to learn how to ride on it yet, so its just sitting covered and locked in my parking lot.
        1980 GS550 - Highland green

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        • salty_monk
          Forum LongTimer
          GSResource Superstar
          Past Site Supporter
          Super Site Supporter
          • Oct 2006
          • 14020
          • London, UK to Redondo Beach, California

          #5
          Welcome to the forum. You're in the right place...!
          1980 GS1000G - Sold
          1978 GS1000E - Finished!
          1980 GS550E - Fixed & given to a friend
          1983 GS750ES Special - Sold
          2009 KLR 650 - Sold - gone to TX!
          1982 GS1100G - Rebuilt and finished. - Sold
          2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

          www.parasiticsanalytics.com

          TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

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          • gtem
            Forum Mentor
            Past Site Supporter
            • May 2022
            • 157
            • Indianapolis

            #6
            Another thing to take a look at is a bench sync: making sure the throttle plates are exposing the pilot/idle holes evenly (also make sure they all flow well when you shoot some WD40 or something through them with some compressed air). That's to start, and then ideally a "real" sync with a quad vac setup. The 850G I'm working on currently had a dead cylinder when I first fired it up after a carb cleaning, I meant to do a "bench sync" but second guessed myself at what I saw as an inconsistent setting of the cyl #2 the throttle plate. Once I tweaked it on the bike I had all four cylinders kicking in at idle, at which point I hooked up my carb-tune and did the fine adjustment.
            Past GSes: '78 1000C, '79 750E, '81 1100E
            Current: '81 GS850G, '98 GSF1200S

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