1981 gs750 (gs750e) Retro Racer project

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  • LarsKroghStea
    Forum Mentor
    • Oct 2015
    • 389
    • Aust-Agder Norway

    #406
    Did some research on the swingarm. The 750 pivot bolt is thinner than the 1100. This means that either the frame will be drilled to accept a thicker bolt, or the old bolt is used with fabricated "top hat" spacers. Because of strict Norwegian regulations regulating modifications to the frame, I don't want to drill the holes bigger. I can probably make some top hats myself, and the swing arm seems like a good upgrade. There's only one of them on ebay, and 13 people has it in their watchlist. Maybe it's stupid to let that one go?

    Comment

    • LarsKroghStea
      Forum Mentor
      • Oct 2015
      • 389
      • Aust-Agder Norway

      #407
      I found an image online of a GS with similar exhaust as I have, box swing arm and the same YSS shocks. I'm leaning towards this being a worthwile upgrade, some time in the future.



      Comment

      • LarsKroghStea
        Forum Mentor
        • Oct 2015
        • 389
        • Aust-Agder Norway

        #408
        I weighed my bike on bathroom scales today in case I decide to order new springs for the fork. It weighs 101kg on the front wheel, and 98kg on the rear. That's without any gas in the tank, and with 10 liters of fuel it will have about the same front rear weight bias as a mid 2000 GSXR. I was aiming for a weight below 200kg, so I'm pretty happy with the result. This will also make the fork handle as intended, wich will contribute to a safe ride
        Trail is 114mm and I believe stock is 107mm. I guess that is close enough?

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        • slayer61
          Forum Mentor
          • Jun 2018
          • 302
          • Stuck in Lodi, again

          #409
          Originally posted by LarsKroghStea
          I found an image online of a GS with similar exhaust as I have, box swing arm and the same YSS shocks. I'm leaning towards this being a worthwile upgrade, some time in the future.


          The swingarm is a common and popular conversion, so much so, I did it on my wife's Kawasaki GPz!
          Paul


          sigpic




          Comment

          • LarsKroghStea
            Forum Mentor
            • Oct 2015
            • 389
            • Aust-Agder Norway

            #410
            Originally posted by slayer61

            The swingarm is a common and popular conversion, so much so, I did it on my wife's Kawasaki GPz!
            Nice to know I've now bought it, and will try to do the conversion this winter.

            Comment

            • LarsKroghStea
              Forum Mentor
              • Oct 2015
              • 389
              • Aust-Agder Norway

              #411
              Ok guys, I've ridden the bike for the first time with the Gixxer fork. So far, it is everything I hoped for It was only 1st and 2nd gear at a large parking lot right by my house, but the brakes and low speed handling and turning couldn't be better.


              Comment

              • Rob S.
                Forum Guru
                Past Site Supporter
                • Dec 2013
                • 9387
                • New York City

                #412
                Is this a seven/eleven conversion? Side cover says 1100.
                1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

                2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

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                • LarsKroghStea
                  Forum Mentor
                  • Oct 2015
                  • 389
                  • Aust-Agder Norway

                  #413
                  Originally posted by Rob S.
                  Is this a seven/eleven conversion? Side cover says 1100.
                  Hi!
                  If you mean the black/orange bike on the picture, that's not mine. Just a random picture showing the 1100 box-section swing arm.

                  My bike looks like this (older photo, bike is more complete now)


                  It has a 16v 750 engine, but with BS34 carburetors from a GS1000 and a Kerker 4-1 exhaust.

                  Comment

                  • LarsKroghStea
                    Forum Mentor
                    • Oct 2015
                    • 389
                    • Aust-Agder Norway

                    #414
                    I need a front fender to secure the brake line going from right to left caliper, but I'm not getting things right with the parts I was using. I've decided to go with the full Ducati Monster-setup until I can find something that fits better. On the Monster it looks like this (I don't have a Ducati.. only the fender):



                    I think the silver brackets make the design a bit noisy, so I did a quick sprayover with black braces and a darker gray on the fender. I think that looks much better.





                    The the bottom part of the braces are too short to fit over a 19" inch weel, and the holes are also wrong. I will get a piece of straight bar and make two new mounts.



                    Comment

                    • LarsKroghStea
                      Forum Mentor
                      • Oct 2015
                      • 389
                      • Aust-Agder Norway

                      #415
                      During the test run I found it hard to change gears, and when I got home I saw something has happened to the left rear set:





                      When mounting the rearset, I believed I had bent the tab in to position, but I probably just bent the bolt. When I rode the bike, the bolt turned a quarter turn from the weight of my foot and got totally misaligned.

                      On the other side I modified the aluminum brackets, and that turned out well:



                      On that side there are two extra bolts, so I just grinded off the tab on the frame.





                      On the left side, I can not grind off the tab, as I need it to secure the aluminum bracket.



                      I'll need to split the top of the tab (on the frame) with an angle grinder, and bend it inwards until it's parallell with the riding direction.



                      Then I'll grind off metal from the back of the bracket until that also sits parallell to the frame. I'll also shorten it. Then the gear-side footpegs will also sit perpendicular to the frame, just like it does on the brake side. At least, that is the plan

                      Comment

                      • LarsKroghStea
                        Forum Mentor
                        • Oct 2015
                        • 389
                        • Aust-Agder Norway

                        #416
                        I've changed some of the bolts already, and today the bolts for the lower triple arrived:

                        From this:



                        To this:





                        Comment

                        • LarsKroghStea
                          Forum Mentor
                          • Oct 2015
                          • 389
                          • Aust-Agder Norway

                          #417
                          The front fender is a more modern look than I wanted, but will have to do for now.



                          I've bought som flat aluminum rods, and will cut them a little longer than the originals.



                          Comment

                          • slayer61
                            Forum Mentor
                            • Jun 2018
                            • 302
                            • Stuck in Lodi, again

                            #418
                            I love the attention paid to wiring pinch bolts
                            Paul


                            sigpic




                            Comment

                            • LarsKroghStea
                              Forum Mentor
                              • Oct 2015
                              • 389
                              • Aust-Agder Norway

                              #419
                              The swing arm has arrived, and I've taken some measurements.

                              First of all; it's very light:



                              I haven't weighed the steel one, but I would guess the weight is almost half.



                              The inner bushing is 16mm (difficult to measure exactly).



                              And the pivot bolt is 14mm.



                              I would guess I could just buy a length of steel tubing with ID=14mm and OD=16mm (1mm wall thickness). Easy to get hold of in 304 stainless steel, and as it'll just sit between the bolt and the bushing (not directly on the needle bearing) I'm pretty sure that will be strong enough

                              Comment

                              • LarsKroghStea
                                Forum Mentor
                                • Oct 2015
                                • 389
                                • Aust-Agder Norway

                                #420
                                Lots of stuff going on lately, and before I could finish the Ducati fender I came by another front fender that suits my build much better:



                                It came with som braces and clamps. I didn't like the clamps, and will swap them with rubber lined clamps. I'll use the rear brace, but will have to make a new front brace because it's too short for a 19" wheel. I'll pick up a length of 6mm stainless steel rod tomorrow along with a pack of clamps



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