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    #1

    Frustrated in California

    > I have a 1979 Suzuki GS850. I bought this bike as a project 2 years ago. The bike is completely stock.I test rode it and it ran but not very well I figured tune up and carbs it had set for a few years. so I trailerd it home once of the trailer it would barley run ....So I went about refurbishing the bike looks great still wont run!
    > I have tried everything I can think of..Set Valves to spec.
    Went thru the carbs about 5 times There spotless Carb dipped then tried ultrasonically cleaning Floats set to factory spec as per manual Jets are correct, all new O rings and gaskets ..She will fire right up But any throttle and she dies.I converted it over to electronic ignition along with new coils and wire to no avail. Dynatex kit..
    Timing looks spot on. I also put new crab tubes on it ( the rubber manifolds)It is presently only firing on two cylinders and at some point fired on all cylinders but not evenly. I check the heat on the header tubes and there all over the place from 85 to 300 degrees.. I use a FLUKE IR Thermometer
    The compression seems ok I have never checked it when it was hot the cold reading was from 90 to 110 psi.
    Any help would be appreciated
    VM Carbs
    Matt



    >
    > Matt
    Last edited by Guest; 02-11-2015, 09:03 PM.
    Tags: None
    #2
    Use these links..
    Unsure if you have VM or CV carbs so there are both tutorials.

    http://members.dslextreme.com/users/bikecliff/


    Page Not Found
    http://www.mtsac.edu/~cliff/storage/gs/mc_maint/GS_CV_Carb_Cleaning_Series.pdf


    http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf


    index
    http://cycleorings.com/


    Pilot jet plugs and carb gaskets available here..

    http://www.siriusconinc.com/search_result.php?make=3&model=&part=1&partno=&x=20&y=13&search=search&start=0
    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.

    Comment

      #3
      Its not firing on all cylinders because the carb sync is all jacked up. You have VMs or CV carbs????
      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.

      Comment

        #4
        Mikuni VM Carburetors

        Comment

          #5
          Fiches show VM carbs. Did you bench sync them before installing on the bike??? Have you freshened up the ends of the wires by clipping off about 1/4 inch and rescrewing the caps back on? Have you removed the resistors and replaced them with 1/8 inch brass or copper rods cut to the same length as the resistors?

          Look inside the caps and youll see the slotted thing that grips the top of the plug. Unscrew it and dump the resistors out...they get weak and fail and thus cause spark and ignition problems. Note that 1 and 4 dont have a spring..drop in the replacement rods and then the slotted deal screws in. On number 2 and 3 there is a spring. Spring goes back in first...then the rods..and then the slotted thing.

          New orings in the intake manifolds too???
          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.

          Comment

            #6
            Yes replaced O rings in the manifolds. All new spark wires and boots from dyna when I changed the coils.
            Last edited by Guest; 02-11-2015, 09:27 PM.

            Comment

              #7
              Never used a Dynatex kit..im sure someone that has is gonna chime in. I have covered all the basic things that effect the carbs and spark. I am thinking maybe the needles are a little different on the Dyna kit??? Someone thats used them will be better qualified than me to go into that rhelm. Someone will be along..be patient.
              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.

              Comment

                #8
                Do you have an airbox installed?

                The VM carbs are not quite as sensitive as the BS carbs, but they still run a LOT better with an airbox.

                Also, what are your mixture screw settings? For a stock bike, the fuel screw (the one on the bottom) should be between 3/4 and 7/8 turn out from lightly seated, the air screw (the one on the side) should be about double that. When warmed up, slowly turn the air screw, listening for best idle.

                .
                sigpic
                mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                #2 son: 1980 GS1000G
                Family Portrait
                Siblings and Spouses
                Mom's first ride
                Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                (Click on my username in the upper-left corner for e-mail info.)

                Comment

                  #9
                  [QUOTE=Steve;2155741]Do you have an airbox installed?


                  This was my 1st thought also. If installed, is it sealed?
                  Larry

                  '79 GS 1000E
                  '93 Honda ST 1100 SOLD-- now residing in Arizona.
                  '18 Triumph Tiger 800 (gone too soon)
                  '19 Triumph Tiger 800 Christmas 2018 to me from me.
                  '01 BMW R1100RL project purchased from a friend, now for sale.

                  Comment

                    #10
                    [QUOTE=alke46;2155802]
                    Originally posted by Steve View Post
                    Do you have an airbox installed?


                    This was my 1st thought also. If installed, is it sealed?
                    Yes. Make sure all the rubber boots are good and the lid has a good seal.
                    sigpicMrBill Been a GSR member on and off since April 2002
                    1980 GS 750E Bought new in Feb of 1980
                    2015 CAN AM RTS


                    Stuff I've done to my bike:dancing: 1100E front end with new Sonic springs, 1100E swing arm conversion with new Progressive shocks installed, 530 sprockets/chain conversion, new SS brake lines, new brake pads. New SS fasteners through out. Rebuilt carbs, new EBC clutch springs and horn installed. New paint. Motor runs strong.

                    Comment

                      #11
                      Hi Guys Thanks for your feed back. The air box is sealed very well with rubber seal and some foam tape..the hoses from the box to the carbs are new as well as yhe tubes from the head to the carbs. I adjusted the cabs as per Steve's advice with some tinkering the Bike now idels with choke off. I had to turn the air mixture screws in to 1/2 turn out from seat to achieve this in order yo get all cylinders up to temp. two cylinders stayed cold at original settings once leaned they came on.. still not rideabul wants to die when throttled.. Pulled plugs two look good two Look fowled (black soot) The coolest cylinders of course.. Checked compression with engin still hot 1=120 2=110 3=110 3=120 2&3 were not as hot as 1&4 While running but only about 30 degrees. any ways better ill keep at it.
                      Matt

                      Comment

                        #12
                        The Bike Has a new K&N air filter

                        Comment

                          #13
                          Are any of the pilot screw tips broke off and lodged in the carb bodies?
                          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

                            #14
                            No all jets are intact

                            Comment

                              #15
                              Originally posted by reoccur View Post
                              No all jets are intact
                              That's not what Ed asked

                              The fuel screw tips often break off, blocking the pilot circuits, which would cause the symptoms you describe

                              You need to pull the carbs (again!) turn them over and pull out all of the fuel screws, then shine a light down the carb throast and see if the light is visible down the hole the fuel screws sit in
                              1978 GS 1000 (since new)
                              1979 GS 1000 (The Fridge, superbike replica project)
                              1978 GS 1000 (parts)
                              1981 GS 850 (anyone want a project?)
                              1981 GPZ 550 (backroad screamer)
                              1970 450 Mk IIID (THUMP!)
                              2007 DRz 400S
                              1999 ATK 490ES
                              1994 DR 350SES

                              Comment

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