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Home built XR 69 replica ( not mine)

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    #1

    Home built XR 69 replica ( not mine)

    I found this interesting XR 69 build on the internet.
    I believe the guy is from the Netherlands.
    Everything is possible when you want it!
    Suzuki gs1000r xr69 endurance replica
    http://www.fmsp.net/t11306-suzuki-gs1000r-xr69-endurance-replica
    sigpicJohn Kat
    My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
    GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020
    Tags: None
    #2
    COOL thread! Thanks for adding it John!
    Ray.

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      #3
      Ive never seen dimples and holes in the engine before.....interesting.
      sigpic
      When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

      Glen
      -85 1150 es - Plus size supermodel.
      -Rusty old scooter.
      Other things I like to photograph.....instagram.com/gs_junkie
      https://www.instagram.com/glen_brenner/
      https://www.flickr.com/photos/152267...7713345317771/

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        #4
        I would imagine it adds more surface area for cooling. I thought the dimples around the sparkplugs was most interesting.
        http://img633.imageshack.us/img633/811/douMvs.jpg
        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

          #5
          Originally posted by dorkburger View Post
          Ive never seen dimples and holes in the engine before.....interesting.
          most of the yoshi GS1000R engines were drilled like this, pops theory was that it aided airflow removing stagnant pockets of air from between the fins

          Comment

            #6
            Originally posted by dorkburger View Post
            Ive never seen dimples and holes in the engine before.....interesting.
            Extra surface area for cooling, there is a fair amount of non-cooled surface area around the plugs. My guess anyways.

            Really cool thread though, I was toying with the idea of building a replica like this a few years ago. Maybe just a little beyond my abilities at the time, but I am getting there.

            Here are some replica panels to help. http://www.airtech-streamlining.com/vintage/hammer.htm
            1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
            1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

            I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

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              #7
              our version of the XR69



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                #8
                Further proof of POPY's attention to detail
                check out the gap between cyl 1 and 2 plus 3 and 4
                between the cylinders and between the fins have been opened up with a porting tool



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                  #9
                  extra roller in bottom of head and mounting point for the top roller



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                    #10
                    cylinders drilled and sleeves cut away




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                      #11
                      smaller valve stems

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                        #12
                        Reduced valve stem or just reduced shank at the head? Interesting that you posted pictures of extra cooling holes drilled into the head. I have never seen that before and have been opening up
                        the factory cooling holes on the past two builds for the same logical reasoning. Hmmm. Good to know!

                        Comment

                          #13
                          I remember the GS1000 works valves were nominally 6.6mm , back in the early 80's i supplied 2 'works' yoshimura motors sourced thru dixon racing ,in Goldalming Uk, who were the official UK Distributor at the time.

                          Comment

                            #14
                            Beautiful work,tons of info.thanks for posting.
                            Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple:twistedevil:, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
                            Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
                            Work in progress: 78 GS1000, unknown year GS1100ES

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                              #15
                              I was looking at an early pops built 1000R motor a few weeks ago, in the Steve Roberts built alloy monocoque which was the predecessor of the plastic fantastic glass monocoques...Anyway, the cases have hand cut grooving all over them. I'd assume, like the holes in the finning, to increase surface area. There's a formula for holes in fins or brake discs to establish what diameter actually increases surface area vs reducing it.
                              I've always been rather surprised at the retention of the 12mm dia Kawasaki valve shims too, you'd think if they went to the trouble of using lighter valves, smaller shims wouldn't have been a problem.

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