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GS650 - Needle Jet Plat and Main Jet Removal Tips?

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    #1

    GS650 - Needle Jet Plat and Main Jet Removal Tips?

    BS32SS carburetors. Doing my first carburetor rebuild.

    Started with carburetor #1 and have everything taken apart except for the screw holding the needle jet plate and the the main jet.

    I have JIS screwdrivers, but I am afraid I am going to strip the needle jet plate screw and the main jet is just not budging. I have left things over night sprayed with carb cleaner and liquid wrench and will try again tonight.

    Any tips for getting these last parts off without doing damage?

    Thanks,
    Dave
    Blog of my motorcycle projects - http://twowheeljunkie.wordpress.com/
    1981 Suzuki GS650L - Project Bike - Sold
    2013 Suzuki SFV650 - Sold
    2016 Ducati Multistrada 1200 Touring
    Tags: None
    #2
    What are you calling the "needle jet plate"? Where is it located?

    The only real trick to getting the main jet out is to use a screwdriver that exactly matches the slot in the jet. Using a driver that's too thin or too narrow will most likely give you problems.

    Do you have an impact screwdriver set? I've found them to be most helpful on stubborn screws.

    1980 GS1000GT (Daily rider with a 1983 1100G engine)
    1998 Honda ST1100 (Daily long distance rider)
    1982 GS850GLZ (Daily rider when the weather is crap)

    Darn, with so many daily riders it's hard to decide which one to jump on next.

    JTGS850GL aka Julius

    GS Resource Greetings

    Comment

      #3
      The red circle on the photo shows the plate.



      Part no. 45 on this diagram: http://www.bikebandit.com/1981-suzuk...1423#sch258417. I should have said needle valve plate.

      I wasn't sure that an impact driver was the appropriate tool for carburetor work.
      Last edited by DaveP; 05-19-2014, 12:00 PM. Reason: Added text
      Blog of my motorcycle projects - http://twowheeljunkie.wordpress.com/
      1981 Suzuki GS650L - Project Bike - Sold
      2013 Suzuki SFV650 - Sold
      2016 Ducati Multistrada 1200 Touring

      Comment

        #4
        That would be "INLET NEEDLE" or "INLET VALVE", there is no "jet" involved there.

        An impact driver with a good bit does wonders there.

        I have never had to use an impact on the main jet, a well-fitting driver has always been sufficient.

        .
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        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
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        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
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        Comment

          #5
          The hand held impact, a tip that fits the screw well, that you tap lightly with a hammer is the tool for this.


          Life is too short to ride an L.

          Comment

            #6
            A pair of vise grips will work on that plate screw.
            '85 GS550L - SOLD
            '85 GS550E - SOLD
            '82 GS650GL - SOLD
            '81 GS750L - SOLD
            '82 GS850GL - trusty steed
            '80 GS1100L - son's project bike
            '82 GS1100G - SOLD
            '81 GS1100E - Big Red (daily rider)

            Comment

              #7
              Of course, you did remove the mixture screw stuff hidden behind the plug???? (on top of carb throat on engine side)
              1981 gs650L

              "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

              Comment

                #8
                That main jet slot looks pretty buggered up. Suggest using a better screwdriver in the future. You may have to cut a deeper slot into the main just using a hack saw blade and giving it another go with a better fitting screwdriver. In your case you may have to use a hand impact driver on that one.

                1980 GS1000GT (Daily rider with a 1983 1100G engine)
                1998 Honda ST1100 (Daily long distance rider)
                1982 GS850GLZ (Daily rider when the weather is crap)

                Darn, with so many daily riders it's hard to decide which one to jump on next.

                JTGS850GL aka Julius

                GS Resource Greetings

                Comment

                  #9
                  99% sure that everything else that needs to be removed has been removed. I was following the two BS(CV) tutorials on http://members.dslextreme.com/users/bikecliff/

                  Is there a known screwdriver size/make that is best for the main jet?
                  Blog of my motorcycle projects - http://twowheeljunkie.wordpress.com/
                  1981 Suzuki GS650L - Project Bike - Sold
                  2013 Suzuki SFV650 - Sold
                  2016 Ducati Multistrada 1200 Touring

                  Comment

                    #10
                    A good quality one that fits tight.


                    Life is too short to ride an L.

                    Comment

                      #11
                      Take your jet to the store and see which one fits best. You'll want to take a Main, Pilot, Pilot air and the Fuel Mixture Screw with you.

                      As for the one that's stuck and all buggered up, I know of no screwdriver that's going to fit that one correctly.

                      1980 GS1000GT (Daily rider with a 1983 1100G engine)
                      1998 Honda ST1100 (Daily long distance rider)
                      1982 GS850GLZ (Daily rider when the weather is crap)

                      Darn, with so many daily riders it's hard to decide which one to jump on next.

                      JTGS850GL aka Julius

                      GS Resource Greetings

                      Comment

                        #12
                        Originally posted by DaveP View Post
                        The red circle on the photo shows the plate.



                        Part no. 45 on this diagram: http://www.bikebandit.com/1981-suzuk...1423#sch258417. I should have said needle valve plate.

                        I wasn't sure that an impact driver was the appropriate tool for carburetor work.
                        Those were buggered up as well on the set of carbs I'm doing now. They were so full of rust and corrosion that you could barely tell they were machine screws. Looked like round rivet heads. Soaked well with PB Blaster. Wire brushed until i could get to the slots. Dental pick for final clean-out.

                        None of my impact driver bits would fit those. I have a set of JIS screwdrivers, but I found that a #1 Phillips screwdriver fit the closest. Flattened the point on the end of the screwdriver just a bit for a better fit. Then with LOTS of downward pressure to keep the screwdriver from 'walking' out, got two of them to break loose.

                        On the other two, ground a slot with a fine cut-off wheel on my Dremel and was able to use a standard flat-blade. Again, LOTS of downward pressure to keep the screwdriver blade from walking out.

                        As others have said - the importance of screwdrivers that exactly fit each individual jet or fastener can't be over-emphasized. Remember - you can't have too many tools!

                        Comment

                          #13
                          I've found that a set of needle nose Vise-Grips is a tool I can't live without.

                          1980 GS1000GT (Daily rider with a 1983 1100G engine)
                          1998 Honda ST1100 (Daily long distance rider)
                          1982 GS850GLZ (Daily rider when the weather is crap)

                          Darn, with so many daily riders it's hard to decide which one to jump on next.

                          JTGS850GL aka Julius

                          GS Resource Greetings

                          Comment

                            #14
                            Main Jet is Out

                            Rather than run around looking for another screwdriver tonight I filed down my 5/16" screw driver until it fit just right. The main jet is not buggered up as bad as it looked in the original photo. A little bit, but more knocking the varnish off.



                            Still need to work on the needle valve plate, but can't work on it again until Wednesday night. I'll let it soak some more, but will probably need to find a new screw for this one and most likely the other three carbs if they have the same corrosion.
                            Blog of my motorcycle projects - http://twowheeljunkie.wordpress.com/
                            1981 Suzuki GS650L - Project Bike - Sold
                            2013 Suzuki SFV650 - Sold
                            2016 Ducati Multistrada 1200 Touring

                            Comment

                              #15
                              Just grab that plate screw from the side with a pair vice grips & that screw will break free in a heartbeat...

                              The main jet might need a torch shot on the outside to expand things a bit.
                              Last edited by hikermikem; 05-20-2014, 06:18 AM.
                              '85 GS550L - SOLD
                              '85 GS550E - SOLD
                              '82 GS650GL - SOLD
                              '81 GS750L - SOLD
                              '82 GS850GL - trusty steed
                              '80 GS1100L - son's project bike
                              '82 GS1100G - SOLD
                              '81 GS1100E - Big Red (daily rider)

                              Comment

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