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vm carb tuning 78 gs 1000

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    #16
    Chuck,

    from your previous posts, it appears that the fuel screws (bottom) richen the mixture when turned out, whereas the air screws (side) lean the mixture when turned out, correct?

    This would make sense, as opening the screw would either allow more fuel or more air...
    Cogito ergo sum - "I think, therefore I am"
    René Descartes

    Comment

      #17
      That's how they work. You can get it to idle a lot better by fine tuning both.
      http://img.photobucket.com/albums/v5...tatesMap-1.jpg

      Life is too short to ride an L.

      Comment

        #18
        The bottom ones richen the pilot circuit only. But Like I said before, thats all the circuit really needs as a maximum setting to stay a tad rich. Below 3/4 I find its too lean. How do I know this you may ask...I used my colortune and watched the color change as I made some investigative adjustments.

        Now, like I also said before, once i set them at 7/8 I have found absolutely no need to dick with them ever again..why?? Because when I put the colortune in and start turning IN the side ( mixture screws ) I watch as the color goes to the orange / yellow color which indicates a too rich fuel to air mixture. Turn the mixture screws back outward and the the flame returns to the bunson burner blue as indicitive of the proper fuel to air ratio.

        These are my findings as the colortune bears the evidence. Take whatever advice your inclined to. All I do is report my exact findings as I have found thru using the tool to tell me what the carbs are doing and why.

        Set the bottom pilots ONCE and forget about them.....again heres how the side ( mixture screws) work. Turning them in cuts off air being mixed with the fuel which makes the mixture RICH. Turning them out adds more air to the mixture which makes the mixture more lean. Picture a water faucet and a sink. The sink full of air is the cylinder with fuel in it. As you OPEN the faucet ( side mixture screw in this case ) more water rushes out ( more air goes into the fuel mixture ).. Just the opposite if your closing the faucet..right?? Same as with the mixture screws..turn them in ( closing them ) takes the air away. Its just as simple as that really.
        Last edited by chuck hahn; 06-19-2014, 06:44 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

          #19
          And yes I note that every engine is its own animal due to wear, mileage, how it was or wasnt maintained etc etc. But i assure you my settings will get you so so very close that youll have to do very little adjusting.
          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

            #20
            Unfortunately not done by carb dip, but after 28 hrs in pinesol these carbs look pretty darn clean !!
            I set up the pilot fuel screw and air screw exactly as Chuck suggested !!
            Fingers crossed all goes well , going out to install them now ...
            Keep you posted .. and again thanks tken and Chuck both your opinions I value !! & appreciate ...

            Comment

              #21
              Bottom view ..

              Comment

                #22
                Looks nice, but I can't see inside the tiny passages where it's important. I guess we'll find out soon enough.
                http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                Life is too short to ride an L.

                Comment

                  #23
                  Did you flush the passages with lots of carb spray and air also...to flush out whatever the Pine Sol has dislodged and softened?????? Set the float hts???
                  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

                    #24
                    Set the big idle knob as well. Touch it off to the throttle linkage then add about 1 1/2 to 2 turns. It may be a bit high but thats normal till you idle her down. And if it starts on choke but idles low after you turn the choke off it may even stall...just add another half turn to the idle knob and try again.
                    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

                      #25
                      Inside looked cleaner then the outside ... and yeah rinsed , then pulled out all my picks and needles etc . Blasted every hole tunnel jet etc 10 times over , and blew it all out with compressor ! What I find handy is the needle you use to blow up footballs etc hooked up to compressor .. fine needle blasting air gets in most those tiny spots !!

                      Comment

                        #26
                        Amnd yeah I set the floats to 24 mm . Measuring from rim below gasket ..

                        Comment

                          #27
                          Sounds good...she should fire right off I would expect.
                          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

                            #28
                            OHHH BABY !!! FIRED RIGHT UP !!
                            like what was said just had to adjust the big idle screw 1 turn ... idling right at 1100 rpm , if I turn the idle down to 1000 I start getting that rattle in the clutch basket .. which is going to be one of the next projects .. taking this girl out for aride and see how she behaves ..
                            Thx again to you both ..

                            Comment

                              #29
                              Also a thx goes out to gatekeeper who has been suggesting things all along via text and his suggestion to use pinesol cuzz I had no carb dip .. he did offer his I will add . But the impatient bugger I am I had to move forward ... lol thx all

                              Comment

                                #30
                                That rattle or CHUGGING is because you now need to vacuum sync the carbs and verify the timing is correct. The bench sync is intended to get the slides "close enough" to start and maintain it running. Now the fine tuning begins. Obviously the timing and syncing cant be done untill it will run and maintain itself..right???

                                Once you have verified the timing and the carbs are synced with gauges, you can then fine tune with the side mixture screws. If, after all that, you still hear a clunking, pull in the clutch lever and listen for the sound to change or even disappear. Dont worry about the clutch hub hut, springs in the back etc etc till your done with the tuning
                                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

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