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gs 850 carb help needed please

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    #1

    gs 850 carb help needed please

    I have an 82 gs 850 running no air box and an open exhaust system.
    The carbs are rebuilt as per the wonderful instructions I found here and a stage 3 dynojet kit installed per their instructions. The bike starts just fine hot or cold( cold needs a bit of choke) idles great but stumbles and misses at nearly all steady throttle positions. if you really crank it the bike gets happy for a couple seconds. Also while unhappy it pops thru the carb and exhaust at crusing speeds.
    Pilots are 4 1/2 turns out and I even raised the needle one groove but still not happy
    Attached Files
    Last edited by Guest; 07-07-2015, 08:44 PM.
    Tags: None
    #2
    ok....where did you come up with 4 1/2 out on the screws.

    Got pods or just an open intake to the carbs..no filters??


    Open exhaust...yeah that never works out well.
    Last edited by chuck hahn; 07-07-2015, 08:56 PM.
    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
      4 1/2 turns out per DynoJet instruction sheet, thank you for correcting me on the Mixture screws because I don't sound stupid enough having no filters and open exhaust.
      Yes open stack no filters and I hear ya on the exhaust, the bike was slated to be a just around town local bike.
      Your help and advice are appreciated
      Last edited by Guest; 07-07-2015, 09:11 PM.

      Comment

        #4
        The thing is that the exhaust will also effect flow and has a monicle of control on how rich or lean it runs also.
        Look at the plugs..use new ones that arent already discolored and run it a bit and then pull then to see how they look.
        And the CV carbs like a bit of restriction at the intake side so get some pods at some point. But in the interum do this...
        Get 4 zip ties long enough to go around the intake side and use some Tshirt material and cover the throats with a square held on with a zip tie. start with 1 layer and youll see a vast throttle response improvement. Dont like it at the 1 layer..then try 2. Basically your tricking them to think they are sucking air thru a pod.

        You need some filtration control and you need to read the plugs and heed what they are saying. Ashy whiteish grey and the carbs are too lean...sooty black is too rich. My bet is they are too rich right now. But get some covers on the front of the carbs and see what happens.
        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

          #5
          Its not that ONE MAGIC THING that gonna make it run good and right..its balance of ALL the factors. All the valve adjustments done and to spec...timing set right..no vacuum leaks in the intake manifold orings..carbs vacuum synced with the gauges... proper air filter / air box. Its all relivant and works in concert on these bikes.
          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
            thanks Chuck will do on the t shirt tomorrow eve.
            I have pulled the plugs on several occasions and they are always dark flat black.

            Comment

              #7
              OK but were they old plugs or new ones after you did the dyna kit??

              The top mixture screw is all that there is on a CV carb to adjust the mixture thats allowed in. Not how much air to fuel ratio though. The fuel and air ar premixed in the needle jet ( the one the main jet is screwed into ). Turning the top screws in will put LESS premix into the cylinders and thus make it run LEANER..out obviously allows more mix in and it runs RICHER.

              So if new plugs turn black they are telling you youve got the screws out too far. And so on if they are whitish grey. See how it all gels now??

              And at the top of the carb/ fuel/ exhaust section in the tech area youll see STICKYS at the top..read them!!!
              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
                And even more good reading......

                Page not found – Ian Williams Tuning
                http://www.iwt.com.au/mikunicarb.htm


                Good info on these pages as well...

                GS850 Carb Specs and Float Height Pix
                http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html#A03


                GS850 Carb Specs and Float Height Pix
                http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html#A04


                GS850 Carb Specs and Float Height Pix
                http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html#A06
                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

                  #9
                  Chuck the plugs were black post jet kit.
                  Gonna get on it tonight with fresh plugs and some adjustments
                  thank you

                  Comment

                    #10
                    Got adjustable jet needles?? May need to drop the needles a tad. This will also lean things out a bit. And like I said before, the only adjustments you can make in the bowls is going with smaller pilot jets or mains. Find some cheapo pods for right now at the local shop. Dont over oil them either. to much oil is like having a stuck on choke. Just a LIGHT mist is all they need...just enough to make the dust stick to them.
                    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

                      #11
                      So tonights carb adventures consisted of going back to the 3rd from the top needle(dyno jet spec) 4 1/2 turns out on the Mixture screws,165 main jets and t shirt over the open carbs. Idles and starts great but now it is unrideable even the gentlest bit of throttle causes the engine to faulter. Man oh man I have never felt so defeated. No matter what I change the machines reactions change but never improve.
                      At this point I am at a loss as to what any possible solutions might be. Craigslist is looking better and better every time I take the carbs off the bike

                      Comment

                        #12
                        The plugs were black AFTER you out the kit in....as you stated right And we know what will lean the carbs out a lot right??? But you still say the screws are at 4 1/2 . Turn the screws IN 2 full turns and see what happens. Sounds like its DROWNING itself outright.

                        Start there and see if theres any improvement..leave the make shift Tshirt filter on..1 layer. Just why did you put the kit in in the first place? Never did know that.

                        Put your location in the signature and ask someone to come by and help. Its easier for an experienced person if they are there to witness the bikes actions first hand.
                        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

                          #13
                          DynoJet info came from here and I will screw the mixture screws in
                          Thank you very much for trying to help me

                          03-27-2015, 11:12 AM #12
                          JTGS850GL
                          Forum Sage Super Site Supporter


                          Join DateAug 2013LocationGrayson, GAPosts2,863




                          With no airbox at all it will idle but will not run much above that. If you plan on running without the stock air filter then be prepaired to purchase some quality pod filters (K&N or APE) and pickup up the Dyno-Jet kit. If not then it will be a LONG drawn out exercise in tuning it properly. Yes, it has been done without the kit and cheap pods but MUCH more hit and miss on the jetting.

                          Comment

                            #14
                            You notice your not getting much help? Because your giving motorcyclists a bad name by running around with open exhaust. Most members will shy away from assisting you

                            Quit while your ahead, there is no way to properly tune that setup

                            Comment

                              #15
                              Actually Jeff I hadn't noticed but thanks for pointing that out. I really didn't think this forum was comprised of tightasses like yourself. I rather thought they were a nice bunch of guys willing to help fellow bikers despite their exhaust preferences.

                              I appreciate you taking the time to critique me rather than offer help.

                              So should I just put the bike out by the curb OR perhaps douse it with gasoline and burn it in my driveway. Perhaps not the latter because the smoke might offend someone.

                              Hey Jeff thanks for nothing

                              Mark

                              Comment

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