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Quad piston caliper blues (continued)

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  • #1

    Quad piston caliper blues (continued)

    I got back to working on or rather reworking the SOS Suspension R1 caliper brackets for the XS11 standard. Originally the spacers that came with the kit to move out the rotors to center in the new calipers were way to thick...

    My solution was to have the right amount machined off the brackets so they would set the calipers in closer to center the rotors in the calipers. I have to say I admire those that get the R1 calipers to work with stock XS11 rotors. I haven't been able to do it yet.

    It seems I measured or added it all up wrong since I was off by .7mm... My solution for now is to use thinner disks. I have some 5mm thick rotors from another bike that have the right offset and diameter and I'm going to send them out to have the centers opened up and drilled for XS11 wheels.

    I don't think any of my observations are all that useful to others but I needed to vent... I feel like Microsoft, by the time I get this to work, it should be great...

    Tony
    Hi my name is Tony and I'm a bikeoholic.

    The old gray biker ain't what he used to be.
    Tags: None
  • #2
    That will be a good mod, some sweeet stopping power. I'm interested in this.
    2H7 (79) owned since '89
    3H3 owned since '06

    "If it ain't broke, modify it"

    ☮

    Comment

    • #3
      I've never been thrilled about the stopping power of most early 80s and older Japanese bikes. Back then I had a Guzzi T3 that would stop on a dime and spit out change and I really miss that kind of stopping power.

      It turns out 1999~2000 CBR600 rotors have the same diameter and offset but the bolt holes are too small and too close in. However there is enough meat to rotate it 1/6th of a turn and drill all new holes... These rotors are about 1/3 the weight of stock XS11 rotors and are already cross drilled.

      If the CBR rotors I bought off eBay are OK when they arrive, I'm going to send them out for the required machine work. I don't trust myself to get them spaced correctly and concentric... I can get new EBC rotors at dealer cost but I'm too broke for that...

      Geezer
      Hi my name is Tony and I'm a bikeoholic.

      The old gray biker ain't what he used to be.

      Comment

      • #4
        Heh heh.... yep, change one thing and other things change, just like ripples in a pool.

        Can you post some pics? I'd be curious about those rotors (thickness, hub hole diameter, etc) too.

        '78E original owner
        Fast, Cheap, Reliable... Pick any two

        '78E original owner - resto project
        '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
        '82 XJ rebuild project
        '80SG restified, red SOLD
        '79F parts...
        '81H more parts...

        Other current bikes:
        '93 XL1200 Anniversary Sportster 85RWHP
        '86 XL883/1200 Chopper
        '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
        Cage: '13 Mustang GT/CS with a few 'custom' touches
        Yep, can't leave nuthin' alone...

        Comment

        • #5
          I'll take pix when I'm done. The center hole in the CBR rotors are about 2mm too small and will have to be opened up on a lathe. Fortunately I've found a guy here in town that does this kind of work.

          I'm looking into getting the caliper brackets drawn up so I can get a quote from eMachineshop.com. If the production costs aren't too bad, I'll have some made up... I could make them here but I would need a new band saw and an oscillating spindle sander. I don't mind buying more equipment but I don't have room for them in my shop...

          Geezer
          Hi my name is Tony and I'm a bikeoholic.

          The old gray biker ain't what he used to be.

          Comment

          • #6
            I made 1 new bracket for the R1 calipers out of 1/2" thick aluminum bar stock and to toot my own horn, I think mine is better than the ones from Australia. I made it in a rather Burt Munro fashion using my band saw, drill press and belt sander. Making a second matching one for the other side is going to be a trick unless I send it out to be cut out by water jet.

            I still don't know if the cost of making them would be worth what any one would pay for them. I like the idea that the calipers are still Yamaha parts and pads won't be hard to find. it looks like the FJR1300 calipers up to 2005 are the same as the ones on the early R1. I will be looking for a pair of FJR calipers to make sure. If this is the case it may be worth offering the brackets for sale but the price will be around $100 pair and I don't think too many XS riders would pop for them.

            I will be dropping the CBR rotors off at the machine shop tomorrow to have the center opened up and the new holes drilled. When I'm done I should have a couple pounds less unsprung weight and more stopping power. I'm stoked just thinking about it...

            If nothing else this has been an interesting journey...

            Geezer
            Hi my name is Tony and I'm a bikeoholic.

            The old gray biker ain't what he used to be.

            Comment

            • #7
              Progress

              I bolted the calipers and the mounts up to a pair of junk fork legs this morning for pix. I won't have them mounted to my bike for at least a week. I've got to much going on and I've had to squeeze the work in on these between other projects...

              warning, this pix are not dial up friendly...

              http://www.oregonmotorcycleparts.com/images/QPC1.JPG
              http://www.oregonmotorcycleparts.com/images/QPC2.JPG
              http://www.oregonmotorcycleparts.com/images/QPC3.JPG
              http://www.oregonmotorcycleparts.com/images/QPC4.JPG
              http://www.oregonmotorcycleparts.com/images/QPC5.JPG

              The stainless bolts I used to mount them to the fork legs are too long and will have to be shortened or replaced and the adapter plates will be painted black before they go on my bike.

              If I can either farm out the cutting of the adapter plates or get some better equipment for the task, I may consider offering these for sale. As it is now, they're way to much work to make. I'd be willing to supply a cardboard cut out so you can make you own for the cost of postage...

              Geezer
              Hi my name is Tony and I'm a bikeoholic.

              The old gray biker ain't what he used to be.

              Comment

              • #8
                Originally posted by Geezer View Post
                I'd be willing to supply a cardboard cut out so you can make you own for the cost of postage...
                You could just make a drawing of it, and post it here, so folks could print it out for themselves. Just like the printable middle/final drive dipsticks.
                1980 XS850SG - Sold
                1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
                Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
                Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

                Whether you think you can, or you think you cannot - You're right.
                -H. Ford

                Comment

                • #9
                  I'll talk to Yaman about doing that. I can't draw worth shiite.

                  In the meantime, I've bought another set of 1999 R1 calipers and I'm going to make one more set of plates after I've tried a new blade in my band saw. If it makes it easier to cut them out, I'll consider making them on special order. I have enough aluminum to make a few more sets...

                  Geezer
                  Hi my name is Tony and I'm a bikeoholic.

                  The old gray biker ain't what he used to be.

                  Comment

                  • #10
                    Hey Tony,

                    Looks nice, but why all the fancy curves...asides from aesthetics?

                    I would think straight line cuts would be easier and quicker to make, and still not look bad!? JAT!
                    T.C.
                    T. C. Gresham
                    81SH "Godzilla" . . .1179cc super-rat.
                    79SF "The Teacher" . . .basket case!
                    History shows again and again,
                    How nature points out the folly of men!

                    Comment

                    • #11
                      Originally posted by TopCatGr58 View Post
                      Hey Tony,

                      Looks nice, but why all the fancy curves...asides from aesthetics?

                      I would think straight line cuts would be easier and quicker to make, and still not look bad!? JAT!
                      T.C.
                      Says the guy with an Octogon deck!!
                      Life is what happens while your planning everything else!

                      When your work speaks for itself, don't interrupt.

                      81 XS1100 Special - Humpty Dumpty
                      80 XS1100 Special - Project Resurrection


                      Previously owned
                      93 GSX600F
                      80 XS1100 Special - Ruby
                      81 XS1100 Special
                      81 CB750 C
                      80 CB750 C
                      78 XS750

                      Comment

                      • #12
                        I think aesthetics are the reason! Those look really nice, man!
                        Healthy is merely the slowest rate at which you can die

                        Some people will tell you that slow is good - and it may be, on some days - but I am here to tell you that fast is better. I’ve always believed this, in spite of the trouble it’s caused me. Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba….Hunter S. Thompson

                        Comment

                        • #13
                          The curves on one side are for clearance and the ones on the other side are for weight reduction. It was either that or drill some holes in it. What would have looked the coolest. would be to sculpt it out but I don't have a milling machine. In the end, I did what was easiest...

                          Given better cutting tools, it would be even more curvy but since I did much of the work Burt Monro style. I got it to this point and decided I worked on it enough.

                          Geezer
                          Hi my name is Tony and I'm a bikeoholic.

                          The old gray biker ain't what he used to be.

                          Comment

                          • #14
                            Adapter plate looks good, Geezer. I know what a PITA they are to make with limited tools.
                            2H7 (79) owned since '89
                            3H3 owned since '06

                            "If it ain't broke, modify it"

                            ☮

                            Comment

                            • #15
                              I had my wife talked into getting the equipment to make these but my shop is already too F'ing small and I don't know where the hell I'd put it.

                              I have my fingers crossed that I can finance a new place with a bigger shop but at the moment it's looking like a long shot...

                              Anyway I'll be looking for stainless caliper pistons for these and some sintered brake pads too...

                              Geezer
                              Hi my name is Tony and I'm a bikeoholic.

                              The old gray biker ain't what he used to be.

                              Comment

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