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Winter project: upgrading time! (R6 forks and more...)

Discussion in 'The Garage' started by Bjorn, Dec 28, 2019.

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  1. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Following your work Bjorn! Would like to do an YZF600R fork/dual disk setup with spoke wheel at some time in the future.
     
  2. Bjorn

    Bjorn XS650 Addict

    Sounds cool Gary! I'll post as much details as possible. Might help other out :)
     
    gggGary likes this.
  3. arcticXS

    arcticXS XS650 Guru Top Contributor

    Regarding aluminium bearing spacers. They should work fine, I have made and fitted a few myself. I make them a tiny bit longer than stock, due to aluminium being more elastic than steel (Young's Modulus is only a third of steel, typically 70 GPa vs 210 GPa)
    On my 1997 Ducati ST2, the OEM bearing spacers are super light alloy extrusions. Smooth inside, longitudinal ribs on the outside, for centering and stiffness. They appear to be made of a high tensile grade, most likely some 70XX. Definitely harder than 6082T6.

    Regarding crankcase ventilation/ reed valve/ catch tank. After I fitted a reed valve from Heiden Tuning, and a single outlet oem breather to my internally stock 77 model, I haven't seen a single drop of oil escaping from the breather hose. I just have it pointing downwards between the carbs, so any oil should show immedeately on top of the crankcase/gearbox. Your reed valve seems to be of a newer design, integrated into the breather housing, while mine is attached to an oem breather via a short hose. Bottom of the line is that you most likely never need to drain your catch tank.

    Although dual discs look great, the front suspension definitely works better with a single And my take on oem vs aftermarket electronic speedo is definitely in favor of aftermarket. Less weight, both unsprung and sprung. No cable to worry about, more exact/correct. And generally added functions like max/average/ dual trip meters and so on. I have good experience with Koso and Daytona
     
    Last edited: Mar 20, 2020
    Bjorn and gggGary like this.
  4. Bjorn

    Bjorn XS650 Addict

    Great feedback, thanks!

    Good to know alu works a bearing spacer . I think I used 6000 series. At work we use a lot of 7075 and 2024, both are quite strong.

    Interesting your breather didn't show any drips. My filter on the end was still sweating a bit. That's why I made the catch tank. We'll see if it stays dry. If it does, made a great practice welding thin stuff haha.

    Yeah I can't argue that the aftermarket Speedo does have its benefits. I'm just not super convinced it can handle the XS vibrations....

    I worked in automotive doing vibrations tests on components, I know for a fact it can mess up quite a lot. I do know the OEM Speedo works...

    Why would the setup work better with one disc? It's a fork that came originally with double discs... interesting to hear your view on it.

    Also scored some nice second hand parts:
    IMG_20200322_132657319.jpg
    IMG_20200322_132716270.jpg
     
  5. LEGEND_10

    LEGEND_10 XS650 Enthusiast

    Bjorn, sorry for the late response. I have about .230" clearance.
     
    gggGary likes this.
  6. Bjorn

    Bjorn XS650 Addict

    After taking my XS for a trip I realized I never posted any updates here about the forks and stuff. Let me see if i can find some pictures of the parts ive been making in the last couple of months.
     
    Jim and gggGary like this.
  7. Bjorn

    Bjorn XS650 Addict

    As a beginning machinist I really enjoyed making this top yoke, learned lots!

    yoke 1.jpg
    It started out life as a block of 5083 aluminium. Not as strong as 7075 but the mechanical properties are about the same as 6082. It is very corrosion resistant.

    yoke 2.jpg I started with the bottom, here the roughing has been done.

    yoke 3.jpg
    Holes added and some more finishing work.

    yoke 4.jpg
    In order to do set-up 2 on the machine, I needed to make a cut in the yoke so I can use its clamping mechanism.

    yoke 5.jpg
    I made a jig representing the forks of the bike. That way i can clamp the yoke and machine everything around it.

    yoke 6.jpg
    Second set-up on the machine. making sure its level with the machine axis.

    yoke 7.jpg Here most of the top side is machined, leaving only the top fillets to be done with a ballnose endmill

    yoke 8.jpg

    yoke 9.jpg
    here is the end result, super happy how it cam out!

    yoke 10.jpg
    last step was to press in the vibration dampers for the handlebars.

    Gonna leave the yoke like it is now. I might have it anodized this winter, not sure yet.
     
    TwoManyXS1Bs, Signal, Jim and 4 others like this.
  8. Bjorn

    Bjorn XS650 Addict

    Here it is mounted on the bike
    yoke mounted.jpg Couldn't stand the molested stem nut. The PO removed the dome from the nut in order to install a RAM mount.

    stem nut 1.jpg
    Made a new nut

    stem nut 2.jpg Much better! For now I used to handlebar risers I had. But i want to make new ones. these are super heavy, I think I can make a version that is more lightweight.

    brake bracket 1.jpg
    The R6 master cylinder uses a separate fluid container, or morning urine pot as I like to call it. I didnt have a bracket.....Because...CNC haha.

    brake bracket 2.jpg
    Dont be fooled by the amount of work that goes into making a bracket like this. Yes the end result might look simple but first you got to come up with the design, then draw it in CAD and finally do the CAM programming to actually have the machine make it. Single pieces might actually take more time this way.

    headlight bracket.jpg The R6 forks have a different diameter than the original XS ones. I made some brackets to be able to mount the headlight. Here there is a benefit doing it on a CNC. the first takes the most time. the rest is a matter of hitting cycle start
     
    TwoManyXS1Bs, Jim, Grimly and 4 others like this.
  9. Bjorn

    Bjorn XS650 Addict

    I bought a adjustable clutch lever from a KTM, sure enough the adjuster bolt didn't fit, it uses a fine metric pitch. Had to make one myself
    clutch adapter.jpg
    wheel spacer 1.jpg
    Remember these wheel - brakedisk spacers? I made them at home but figured i could remove some excess weight to keep the unsprung weight down.

    wheel spacer 2.jpg
    Also made a new spacer for the replacement of the speedo pick up. Wont be using that anymore.

    wheels 1.jpg
    Here is the wheel assembly with the spacers and TDM 850 disks.
     
    Last edited: Sep 16, 2020
    TwoManyXS1Bs, Signal, Jim and 4 others like this.
  10. Bjorn

    Bjorn XS650 Addict

    I had some bad luck with the brake set-up at first. They came with the forks and looked decent on the outside. After fitting the entire system together, it took me about one day of cursing to get all the air out of the system. The next day i would see the bleed nipples weeping :( They were holding pressure but i couldn't live with this. I tried the easy stuff first. The nipples themselves use a 90° seat against the brake calliper. since they looked beat up, i refreshed them first.
    bleed nipple 1.jpg
    bleed nipple 2.jpg
    I cut a new 90° face on the nipple to see if it would cure the problem. Unfortunately it didn't.

    Inspecting the seats of the callipers is hard because they are hidden deep inside the calliper body. I made a lap and a guiding bushing to re-lap the seats. Just like you would with the seats of valves.

    bleed nipple 3.jpg Here is the lap

    bleed nipple 4.jpg Really didnt want to bleed the system again, so i mounted the callipers upside-down for this step. Used the grinding paste for valves, course and fine. Afterwards i flushed out the entire system with clean fluid.

    bleed nipple 5.jpg
    After this i had no more leaks
     
    TwoManyXS1Bs, Signal, Jim and 2 others like this.
  11. Bjorn

    Bjorn XS650 Addict

    probably skipped over some details along the way. But here is the end result:
    endresult 1.jpg
    endresult 2.jpg

    And i made this quick little video:


    I took the bike for a long weekend to Luxemburg with some friends. unfortunately I had (and still have) some nasty malfunctions with the ignition system which made it more of an adventure then i wanted. Any ways you can read more about that in my other topic (Help safe my trip).

    On the positive side: The forks and brakes work outstanding! I could not be more pleased with the end result. I think my offset top yoke paid off because the bike doesn't feel nervous at all. The brakes are unbelievable. two finger braking all day long. my friends ride mainly old BMW's (R60,R80 and R100). Riding those bikes, made me realize how much better the forks and brakes are.

    Apart from the non running issues, there are still some things I want to look into. Things like a lightweight front fender, been using the oem steel one for now. getting the tacho to work, changing the seat, it looks comfy but isnt. and probably lots more.

    Let me know what you guys think! and if you have any questions, shoot!
     
    TwoManyXS1Bs, DoubleE, Jim and 3 others like this.
  12. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Wow, just WOW!
    Thanks for the detailed report on the front end. Hung on every word of your machining, CAD adventure.
    You know you just forced me to do an R6 front with spoke wheel? Thanks bbbbBuddy!
     
    TwoManyXS1Bs, Signal and Jim like this.
  13. Grimly

    Grimly XS650 Addict

    245
    500
    93
    Ireland
    I nominate this as a calendar bike.
     

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