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    #1

    gs650 slide questions

    I put k&n pods on my 81 gs650. went up 3 jet sizes and put 3 shims under each needle. runs ok but has a bog under acceleration like the slides aren't opening fast enough. My uncle said something about drilling the hole in the bottom of the slides bigger? If I spring for a dyno jet kit will it help my problem? Oh running stock exhaust right now but plan on swapping open universal mufflers on it this week.
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    #2
    Yes, a Dynojet kit will help, but in the meantime, I have to ask if you did it correctly.

    When you put the three shims under the needle, what did you do with the thick plastic spacer above the clip?

    There is a spring that pushes the needle UP into position. Adding spacers under the clip will do nothing except increase the preload on the spring.
    What you need to do is to remove the thick plastic spacer and replace it with spacers (washers) that are about half as thick so the needle will ride a bit higher.

    .
    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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      #3
      ohh ok i put the washers under the clip.

      Comment

        #4
        Originally posted by 67camaro View Post
        ohh ok i put the washers under the clip.
        As mentioned earlier, all that does is add preload to the spring.

        You might not have to remove the carbs, just take the tops off (you will have to also loosen the throttle and "choke" cable brackets) and you can pull the slides.

        .
        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

          #5
          removed plastic spacer and put two washers on top of the clip. Night and day difference. I'm gonna run it like this for a while or until money comes my way. thanks for the help

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            #6
            put on the open mufflers and went up to 120 mains and 3 turns out on the screws. after i just ride it around no wide open just cruising the plugs looked a little lean but not too bad. After I adjusted the mixture screws again and let it idle for a minute or two the plugs all look brown/tan. I want to drill the holes in the slides bigger tonight since I have to take the carbs back off to get to the timing chain tensioner. How big should I drill them? What size drill bit does the dynojet kit come with?

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              #7
              anybody know what size the drill bit in the kit is? All I can find is stuff for harleys and they say to drill to 1/8th but i know that's way to big

              Comment

                #8
                These instructions from Dynojet for a GS 700 indicate a 5/32 bit. The 750 instructions are the same. Unfortunately there are no instructions on Dynojets website for GS 650s

                Jet Kit for 1980-1985 Suzuki GS700
                http://www.dynojet.com/pdf/3125.pdf
                Dynojet Jet Kits Whether you run a standard motorcycle, or a tuned sportbike, Dynojet Carburetor Jet Kits can provide you with a simple and affordable solution to all your carburetion problems. Dynojet Jet Kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy. Each Dynojet Jet Kit includes comprehensive instructions which show step-by-step installation and testing procedures to ensure a perfect setup every time. This is backed by free telephone and Internet support to Dynojet customers. Kit installation and Dynamometer services are available in many parts of the world. Please see the Dynamometer Center Search Page to locate your nearest dyno shop. Read Full Description Jet Kit Types Needle & Needle Jet Caps Many newer bikes have very flat power and fuel delivery curves when used with the stock exhaust and air-box. When aftermarket pipes are used, the power curve is usually not flat. You find the need to lean out for low speed and richen up for top end; or leaner on the top end and richer at the low speed. In order to achieve full function and driveability, Dynojet develops shrouds or cap style nozzles for adjusting the upper or lower top end. They also have an effect similar to fuel injection by breaking up the fuel as it enters the air stream. Fuel Needle The design of the needle is where Dynojet spends most of its R&D time. The needle is designed to give the correct amount of fuel throughout the mid-range and is also designed to allow adjustment from groove 1 to groove 6 with little or no effect below 3000 R.P.M.; then with the correct end dimensions, the needle will have little effect on the main jet regardless of needle position. This isolates all circuits from each other and ensures easy set-up of the midrange and driveability. Main Air Jet This jet allows air into the emulsion tube to mix with fuel being drawn up from the float bowl. It controls the amount of fuel which can be pulled from the float bowl into the venturi. The larger the size of the main air jet, the more air you get and less fuel. The smaller the main air jet, the more fuel you get and less air. Dynojet alters this only to achieve the flattest possible fuel delivery curve. Pilot Circuit This controls 100% of the engine idle and 25% of the transition onto the needle. Dynojet has found that the engine will idle with the standard pilot jet, with or without the air-box and with the slides and needles removed from the carburetors; therefore we never change the pilot jet. Doing so is proof that you are not using the other circuits correctly. Idle and off idle is controlled by the mixture screws and the float level which have the most positive effect below 4000 R.P.M. On some models the pilot air jet is changed to provide optimum fuel economy. Correct balancing of the carburetors also ensures a smooth idle. Main Jet We develop our main jets to correctly serve two functions; static load and dynamic load. The static load is the fuel received through the main jet in the upper gears, where the tachometer is moving very slow. The dynamic fueling portion of the main jet is the amount of fuel received from the jet in the mid-range potion of the power. For example, you have a GSXR1100 G,H with #130 main jets. You then install #125 mains. After running the bike you notice the top end has improved but the mid-range doesn't pull as well. You then install #135 mains and you notice the mid-range is great but the top end is slower. This is a common compromise when using stock main jets and needles. If you install Dy 93 Dealers Orders Dealer Orders "Dealer Orders Dynojet Research Inc. dealers much call in to place an order. Please call us at: 1-800-992-4993 (Toll Free)/Suzuki/GS700/1985


                Did a bit more digging.

                The instructions in this post for a 650 indicate a 5/32 bit as well.

                Got my Dynojet kit in the mail today, W/ no instructions! Help! - The GSResources Forums
                http://www.thegsresources.com/_forum/showpost.php?p=1187733&postcount=7
                Place your GS performance, tuning or mods related questions in this forum.


                Good luck.

                BTW I got these by searching...

                Comment

                  #9
                  thanks for the info

                  Comment

                    #10
                    went ahead and bought the dyno jet kit last night. I'm really getting tired of messing with this thing and I just want to ride. SO once I getthat in hopefuly I'm about done with messing with the carbs

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