Motomaster 320mm single front disk

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by K2m, Sep 30, 2007.

  1. K2m

    K2m ....58....

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    For those who are thinking about fitting a single disk

    It's simple

    Grab some small bearings from a bearing supplier to space the disk, and the caliper (from the calliper carrier)

    2 bearings X 5mm wide M8 axle

    6 bearings X 5mm wide M6 axle

    6 X 5mm longer KTM bolts (they trigger the speedo signal {hall effect}and must be steel)

    [​IMG][/IMG]

    [​IMG][/IMG]

    You will also have to relocate your speedo drive

    [​IMG][/IMG]

    you will have to remove 1.5mm from the inside of the calliper carrier. I used an angle grinder with a flap disk. A bit of trial and error

    This side
    [​IMG][/IMG]

    But now for the best bit____

    On the box which no one reads:eek1

    [​IMG][/IMG]

    is advice relating to the master cylinder, so I got ..........a

    [​IMG][/IMG]

    off the Super enduro ($180AU) which works PERFECT with this 4 pot caliper.

    You can do anything with this combination...... Simply Perfect. :clap

    If you are worried about twisting forks then don't do it!

    Thanks to those who went before me, and gave advice...... Flanny, Gregore, Ricardo, Stephen and evilkymevil and many more.........
    #1
  2. Lewy

    Lewy Minus the LC8

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    Nice one Rory.

    Why do you have to worry about twisting forks?

    As far as I can tell the forks are the same as the ones I had on my 640SM.

    It had 320mm disc and 4 piston caliper and never twisted anything
    #2
  3. K2m

    K2m ....58....

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    Maybe I should rephrase that.

    "If you think that going to a single disk will cause the forks to twist then don't do it."

    The last time this was discussed it turned into a safety argument. Ended the very good idea's that were flowing freely.:lol3
    #3
  4. Lewy

    Lewy Minus the LC8

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    Ok so it was just people who hadn't done it before saying it wouldn't work:deal
    #4
  5. K2m

    K2m ....58....

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    Well said Lewy.:evil
    #5
  6. uk_mouse

    uk_mouse Aquatic adventurer

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    Why bearings instead of plain spacers? Were they just convenient?
    #6
  7. K2m

    K2m ....58....

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    It was all I could find with that accuracy. you could have an engineering shop make them, but it would cost a fortune. They work well as there are 2 surfaces to sit on, and the load is spread, Life can be a bit tough down here in the antipodes, as there are so many things you cannot get, that are freely available in Europe and the States. If we can get it it will be at a Rip-off price.

    We do a lot of shopping on the Internet:lol3

    I got the Motomaster from motostrano http://www.motostrano.com/cosubrsy.html

    $550 on special:clap Less than a week to get here.
    #7
  8. K2m

    K2m ....58....

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    This brake is much stronger than the standard twin disks. There is excellent feedback through the SE master cylinder.:wink: I have had it on for a month, but have not been on the dirt yet.
    #8
  9. evilkymevil

    evilkymevil The Modifier

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    On ya Rory,

    You have seen the light the lightening of 3 kg off the front end will transform the way you can now powerslide out of turns without the front pushing. On dirt that is.
    Not to mention the feel and control at the lever.
    Now you just need a set of 17" wheels to go with that set up to really put it to the test .
    I have the motomaster off my kx450 supermoto i am yet to try on my 17" rims.
    I'm using the se master cylinder with the standed caliper for serious dirt work, and i'm extremely happy with the power and feel.
    I'm keen to get feedback on how the motomaster feels on the dirt.
    I know on my kx450 the front brake lacks feel on the dirt sections and too much power. This bike only weighs 100 kg though so i suspect it will feel different to the 950.
    My plan was to swap the standard caliper,brake line and se master cylinder
    when i'm swapping from standard wheels to 17" wheels, and put on my motomaster ,line and a suitable master cylinder to obtain the best brakes for road riding and the occasional track day.
    But Rory you say that that your set up using the se master cylinder is stronger than the twin disc set up.
    Maybe thats all i need is to just use the motomaster for both wheels.
    #9
  10. K2m

    K2m ....58....

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    I followed you after you picked up your SE pump I picked up mine, and ran a single floating(990) disk for a few weeks, but was disappointed with its lack of power for an emergency stop. I'm sure it would work well on the dirt.

    We need some testing of the SE pump and Motomaster caliper on the dirt. I tried emergency stopping in the wet and was most impressed.

    I have a new set of scorpions to ware out so I have time to consider what to do with my original rims. I have a set of spare wheels with a 21 X 1.85 front and a 18 X 3.5 rear with excellent German dual sport tires. The rear, pictured here is a 140 X18.

    [​IMG][/IMG]
    #10
  11. mookymoo

    mookymoo Mookish Mook

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    Whats the motivation behind having a single disc?
    #11
  12. mookymoo

    mookymoo Mookish Mook

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    I dont want to hijack the thread-but what are those rear tanks?
    #12
  13. K2m

    K2m ....58....

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    "the lightening of 3 kg off the front end will transform the way you can now powerslide out of turns without the front pushing. On dirt that is.
    Not to mention the feel and control at the lever." = evilkymevil<EVILKYMEVIL>

    I think that that sums it up quit well.

    It's all-right it's my thread:lol3

    I did some fiberglass work on my bike. Sort of "make the things that you cannot buy."
    Here's another shot from the front

    [​IMG][/IMG]
    #13
  14. mookymoo

    mookymoo Mookish Mook

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    Ok. I forgot about the calipers when considering the weight. It had been suggested that single disk gives you more options when it comes to buying hubs - and that the gentler braking in the dirt is better.

    As for the tanks, looks good.
    Post some pics of your tanks on the "Show us your pics" thread.
    #14
  15. Bannisdale

    Bannisdale ....snowing now!

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    A lot less of it is always a good thing....3 Kg is a lot!:clap
    #15
  16. Stephen

    Stephen Long timer

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    Three kg is a lot, indeed. :nod

    Way to go, Rory. What would we do without you? :thumb

    I really like this.

    So, now the bracket comes with the brake -- Gregor had to make his own.
    #16
  17. K2m

    K2m ....58....

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    Thank you Stephen for your kind words:D

    A big thanks to Mateo (Barbasma) on his advice
    I ordered the brake kit for the 620/625/640 KTM
    Molto bene!
    #17
  18. MvZee

    MvZee Been here awhile

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    So.... who was it that said it couldn't be done??? :ear Been there... done that.... years ago!
    #18
  19. KrustyKustom

    KrustyKustom Lets Go....

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    could you mount up two of the 320's? or is the caliper only set up for one side (that is a brake line port on one end)

    Wow, two 320s would be cool.
    #19
  20. K2m

    K2m ....58....

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    :lol3 It will not mount on the other side:lol3 How much is to much?
    #20