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Pods, Pipes, Panic! (Help! Your Bike has Pods)

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    #76
    so you have adjustable needles for sure?

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      #77
      i need to pull one and check..

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        #78
        Do high speed plug chops and read them. No one can tell you what to do from riding descriptions.
        1981 GS650G , all the bike you need
        1980 GS1000G Power corrupts, and absolute power corrupts absolutely

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          #79
          Referencing this link:

          Your bike came with 112.5 mains and 42.5 pilots.

          According to this link:
          The following useful guide to rejetting was posted by Mrkil in the forum. He found it at xjbikes.com: MAIN FUEL JET SIZE CHANGES NEEDED PER TYPICAL MODIFICATION: Typical Exhaust Changes: +2 main fuel jet size for custom 4-into-2 exhaust or +4 main fuel jet sizes for 4-into-1 exhaust or +4 main jet sizes for no muffler (open headers) Typical Intake Changes: +2 main fuel jet sizes for single K&N filter (inside a stock airbox) or +2 main fuel jet size for drilling holes in the airbox with stock fil

          You need 127.5 main jets and 47.5 pilots.

          Raise your needles about a mm, as per the WAG method(WAG - wild-@$$ guess).

          Comment


            #80
            Hi everybody
            Sorry for diusturbing everyone, with my "case"...
            I have a GS 550 E 1979, with VM22SS carbs, 4/1 with smg like a free megaphone exhaust, and a grid into the airbox....
            Historically, I puted 110 mains and had a "lean" behaviour... I did yesterday plug chops at WOT and half throttle (to see about the needle position), my spark plugs were very.... white. I tested 120 mains, but I could not go up 3000 rpm.... I am putting 115 mains now, with the clip on the 3rd position. I will try it tonight or tomorrow. I am so surprised that, with a free 4/1 exhaust, and a grid into the airbox, that I have to increase the size of mains about 40 / 45%!!! I think a grid into the airbox is a good solution to increase performance.

            http://imagesia.com/20150323-225342_vxi0

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              #81
              Originally posted by SoHum View Post
              I bought a pair of Uni double foam filters and a 6-Sigma jet kit. They supplied two sizes of main jets, pilot jets, a couple of drill bits in case I wanted to do wilder mods (which the instructions warn repeatedly can cause low speed/throttle drivability problems and should only be performed for racing purposes), and several shims for the fuel needles, as well as a pretty good set of instructions. The kit was reasonably priced ($56 shipped for a two carb kit) and they sent me an email asking about any mods and normal riding elevation.
              SoHum, let me know how the jets work. Contemplating a set, but with our really crappy exchange rate it is a bit pricey!

              thanx!

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                #82
                Guys, this is an informational stickie

                You should read it and post up your problems in the forum below, not here
                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

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                  #83
                  Ok so I'll try to ask smg about pilot and air screws settings when pods and 4/1...
                  In my '79 gs 550 (VM22 carbs), I had to put larger main jets, and raise the needles... ok for them.
                  About pilot (fuel) and air screws, Do I have to keep the standard settings or adjust them to increase the air / fuel flow when idling to avoid dying at idle?
                  I mean, standard setting to have the good air / fuel setting is air screw -1.5 turn / fuel screw -5/8 turn. Do I have to put for example a similar setting (but with more amount of air / fuel) like air screw -3 turns / fuel screw -1.25 turn?

                  This is for pods and 4/1 exhaust...

                  thanks!

                  Comment


                    #84
                    Hello i have a 81 450 with slip on jigh flow exhaust tips and pod filters i was looking at getting a jet kit from 6 sigma anyone bought from these guys wanted to know how there quality of the kits are

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                      #85
                      I have a jet kit, I ordered from them about 2 years ago, in my 1979 GS 750E. I had re-jetted when I put generic ebay pods on my bike, but when one popped off and blasted me in the leg at like 70mph, I decided to invest in some K&N pods. However, in doing so my bike would not run with the now increased air flow so I wasn't sure what to do next and I needed an answer fast so I found the 6 sigma kit on ebay. They asked me about my exact location and modifications and sent me a kit tailored to my bike and atmospheric conditions.

                      The kit had easy to follow instructions and told you where to set the needle with the "e-clip" and everything. However the installation was really easy for me since I have the VM carbs, depending on your carbs you may need to use the drill bit that comes with the kit.

                      One interesting note about that kit from them was that they even thought about different jets for the inner cylinders vs the outer cylinders which I found really interesting. I don't remember them proving an exact explanation but I believe it would be due to the fact that these engines are air-cooled so the inner cylinders can get hotter than the outer so they provide slightly bigger jets for the carbs for the inner 2 carburetors. I am not sure if that is a normal practice or not.

                      They even provided an alternate set of jet sizes in case the first ones weren't quite what you needed.

                      Comment


                        #86
                        Originally posted by Harry 66
                        Hello.I have a question to the carburator wizzards. This is a dyno run from my GS750 1977 Uni filter pods, open exhaust. Pilotjet 15, Mainjet 117.5, fuelscrew 2 turns ,air screw 1.75 turn, needle one notch from downside. So needle can move one higher.
                        It runs not bad however runs a bit lean on the lower revs. Float level standard . What should I do to make it a bit better?
                        [ATTACH=CONFIG]46629[/ATTACH]

                        I don't have as much experience with jetting cv type carbs as most of the people here, but I have jetted several regular style carbs using a wideband. I know on a cv carburetor working correctly that the slide isn't open all the way until the engine rpms are high enough to use the additional air. So if your carburetor slide is less than fully open it is using the needle to regulate the amount of fuel entering the engine, I would sure try raising the needle and it should help.
                        And that is really lean at low rpms...
                        1982 GS1100E "Jolene"

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                          #87
                          Hey guys,

                          so ive got my bike torn halfway apart and just started to put here back together. 1978 gs750. I will be running delkevic 4-1 exhaust and K&N pods. I did a full carb tear down, cleaning, orings/gaskets/fuel tubes, re jet (120 main/17.5 pilot) and jet needle moved one notch richer.

                          I guess my question is: should I start with stock fuel and air screw settings as a benchmark or does anyone have a similar setup that really purrs through the gears, and is willing to share their settings as a better starting point

                          also I'm installing SS exhaust studs to replace stock bolts.. I've read that you go locktite stud to head , and anti seize on the nuts. Is this correct??

                          thanks for the space and your time
                          andrew r
                          sigpic

                          1978 GS 750

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                            #88
                            No personal experience with your particular setup, but the general concensus is to go 1 turn out on the fuel screw (the one on the bottom) and 1.5 to 1.75 turns out on the air screw (the one on the side). After it warms up enough to run without "choke", use the air screws to fine-tune the mixture for best idling.

                            .
                            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.)

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                              #89
                              Perhaps a dumb question. But I have a 1978 gs550. Are there any aftermarket air filters that are perhaps a bit lower profile and smaller then the stock air box that do not require re-jetting?

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                                #90
                                Not that I've found.

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