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'77 710...ish

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    #31
    [QUOTE=Chuck78;2573954]Confusing title at first, I kept thinking of what size GS650 piston would make 710cc, or what you could do to destroke a 750!
    Then I saw the clutch cover linkage... Then the 710 started making sense! Not quite as talked about as the 7/11 swaps... A hyphen or backslash would make 710 (7-10 or 7/10) a lot more self explanatory!

    ​You're absolutely correct. I take full responsibility for this snafu... This build wasn't intended but since the 750cc ripped #1-2 cam cover out of the head I purchased another cylinder head. While waiting on parts a 1000cc mill showed up... and then the 2002 GSXR 750 called my name. So here we are !!!

    I think you're going to be searching for shock springs for a while, but you may want to look into ATV and snowmobile shocks. Something of a laid down angle on one of those heavier machines could be closer to your range needed? Then you'll need different valving as well vs standard bike valving... There's likely going to be a lot of trial and error involved unless you enlist someone like Racetech to plug everything into their computer formula for a valving answer, or if you know someone with a shock dyno and you find some online calculator tool that gives you valving/damping rate targets based on suspension geometry...

    I'm going to keep it old school and build my own with what I have. No fun in paying someone to do something that I need to learn about if I am going to be street racing and cruising the First Coast. When I want to dip into the 8's, then I'll talk to a shock specialist. I do however have access to a LSR holder that currently goes around in squiggly circles... on a Triton!!!

    Personally I would shorten that swingarm A LOT, to maybe 2.5" or 3" longer than stock if I was only looking for higher hp straight line performance.
    Are you going with a 16v 1100E clutch basket? Or custom making a H.D. backing plate for the 1000 clutch basket?

    This swingarm gives me a range of adjustment from 3-6". I am NOT looking to turn corners as I have a BWM R1100 for this.
    I'll look into the clutch basket. Not going that quick... yet.

    Suzuki Performance Spares sell a spacer kit for the clutch cover to be able to run an 1100E clutch basket without loosing any clutch discs (as the basket has to be machined down to fit in a 1000 otherwise).

    IIRC MRE sells a cover that orients the clutch cable to run down the right side.

    Welded crank will be VERY necessary, from the rear tire choices alone... A lot more traction than a 79 GS1000 had available back then, & hard use/abuse could twist a crank on those even!

    I've looked into this and I'm sure it's in my future...

    What pistons? MTC had some bargains on some old school 74mm GS1000/1100G pistons a year or so ago. They are pretty old school though, NOS, heavier than a modern Wiseco or JE by a fair bit.
    Would require 1100G cylinders, 1000 base gasket trimmed, block decked a fair bit (.020"?)

    Stock.

    What carbs? Can't make out in the pics. Sticking with the small port head?

    Jetted 26's for now.


    Best of luck.

    Thanks

    As this is the initial assembly, engine wise everything is stock except for the jetted carbs, Dyna S and V&H header into some $15 fleabay muffler that actually sounds pretty good. Deeper tone. I'll play with the gearing, learn about spring rates, rebound and more all while having some fun. Then after the thrill wears off I'll start adding duration and lift, pistons and more.

    Last edited by unfocused; 12-03-2019, 06:57 PM.
    Current:
    1993 ZX11 - 2nd build in progress
    1977 GS750 (710 is getting closer)
    1998 Kawasaki Voyager - selling
    1998 Chevy C2500
    1999 Rav4

    Comment


      #32
      [QUOTE=80GS1000;2571669]Looking good...

      A couple things to keep in mind when using late model upside down forks on our GS bikes:

      1. Fork springs on late model GSXR forks tend to be too soft for installation on a GS. You'll likely need around 1.0 kg/mm springs to get it right. Check the Racetech website for recommendations on spring rate https://racetech.com/ChooseVehicle.aspx and factor in the weight difference between the GSXR and GS in your calculation.


      I see what you mean about soft. Under normal suspension sag, I had 1.5". After further research and understanding I was able to adjust pre-load enough to keep sag at about 20mm-ish but this just about maxes out pre-load. Bike is running/driving and the front feels decent. I have let loose some part throttle hole shots but since the swing arm/suspension isn't finished squat/weight transfer is still up in the air. Although she comes out of the hole pretty good.


      1. Check your rake and trail to make sure the bike will be stable and handle decently with a calculator like this: https://www.rbracing-rsr.com/rakeandtrail.html Trail is very important and you don't want to go under about 3.8" of trail for stability. Given this is a dragbike, more trail is better to keep it stable in a straight line at speed.


      As the bike sits right now ( no rear suspension ) we're pretty close. This is something I have watched during my build. I have ridden her and in short burst of up to about 35-50 mph she tracks well. At about 30 mph I can let go of the bars and feel comfortable. Will check back on this after finalizing the rear setup.

      Thanks
      Current:
      1993 ZX11 - 2nd build in progress
      1977 GS750 (710 is getting closer)
      1998 Kawasaki Voyager - selling
      1998 Chevy C2500
      1999 Rav4

      Comment


        #33
        As of Dec. 3rd 2019

        She runs.
        She drives.
        Signals work. Well the fronts are getting some odd feedback. But they still work, without the engine running
        Horns not installed yet so listen for the 9mm
        Funny how the original charging system not only works but charges at 13.8 volts.
        Simple hole shots have elicited large smiles.
        A mild burnout (can be seen on Instagram under unfocused_adventure) sent me to Cycle Gear for some Bridgestones LOL
        Sounds well, looks good.
        Still needs foot pegs, rear suspension and rear brakes.

        Knee surgery in two weeks, down for two weeks very little will be done after this weekend until the turn of the New Year !!!


        3.jpg
        Current:
        1993 ZX11 - 2nd build in progress
        1977 GS750 (710 is getting closer)
        1998 Kawasaki Voyager - selling
        1998 Chevy C2500
        1999 Rav4

        Comment


          #34
          Another one...

          2.jpg
          Current:
          1993 ZX11 - 2nd build in progress
          1977 GS750 (710 is getting closer)
          1998 Kawasaki Voyager - selling
          1998 Chevy C2500
          1999 Rav4

          Comment


            #35
            ... and it starts LOL

            burnout.jpg
            Current:
            1993 ZX11 - 2nd build in progress
            1977 GS750 (710 is getting closer)
            1998 Kawasaki Voyager - selling
            1998 Chevy C2500
            1999 Rav4

            Comment


              #36
              Originally posted by unfocused View Post
              Another one...

              [ATTACH=CONFIG]59689[/ATTACH]
              Looking good man! That GS1000 engine sounds healthy!
              Bikes:

              1980 GS1000 restomod
              2006 GSXR 750

              Comment


                #37
                [QUOTE=80GS1000;2574692]Looking good man! That GS1000 engine sounds healthy!

                Thank You.

                I believe the exhaust setup helps. As you are, I am impressed with the sound.
                I've managed to take her around the block and I'm very thankful for the deep tone!!!
                Current:
                1993 ZX11 - 2nd build in progress
                1977 GS750 (710 is getting closer)
                1998 Kawasaki Voyager - selling
                1998 Chevy C2500
                1999 Rav4

                Comment


                  #38
                  Still recovering from a nasty knee surgery.
                  But got this far.. anyone going to Eustis, FL this Saturday?
                  See it there.

                  home stretch 1.jpg
                  Current:
                  1993 ZX11 - 2nd build in progress
                  1977 GS750 (710 is getting closer)
                  1998 Kawasaki Voyager - selling
                  1998 Chevy C2500
                  1999 Rav4

                  Comment


                    #39
                    Thought I'd add a picture of the Norton that's also been occupying my time during recovery.

                    Shameless I know LOL...

                    home stretch 3.jpg
                    Current:
                    1993 ZX11 - 2nd build in progress
                    1977 GS750 (710 is getting closer)
                    1998 Kawasaki Voyager - selling
                    1998 Chevy C2500
                    1999 Rav4

                    Comment


                      #40
                      Made it to the show today. Had a good time chatting with everyone and met some wonderful people.

                      Also found this seat pan that looks fantastic.

                      seat 8.jpg
                      Current:
                      1993 ZX11 - 2nd build in progress
                      1977 GS750 (710 is getting closer)
                      1998 Kawasaki Voyager - selling
                      1998 Chevy C2500
                      1999 Rav4

                      Comment


                        #41
                        This is how she looked with the seat pan mocked in place.
                        This pan is engineered to fit a Triumph Bonneville made by a local Florida company.
                        It fits well...

                        seat 18.jpg
                        Current:
                        1993 ZX11 - 2nd build in progress
                        1977 GS750 (710 is getting closer)
                        1998 Kawasaki Voyager - selling
                        1998 Chevy C2500
                        1999 Rav4

                        Comment


                          #42
                          As of 01.28.2024:

                          I've removed the 1000cc engine to put in the other GS750 I have that took out it's engine.

                          In this picture I've installed a 95 Katana 750 engine and complete wiring.
                          It runs but has not been ridden yet.

                          Resized_20240128_124727.jpg
                          Current:
                          1993 ZX11 - 2nd build in progress
                          1977 GS750 (710 is getting closer)
                          1998 Kawasaki Voyager - selling
                          1998 Chevy C2500
                          1999 Rav4

                          Comment

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