KTM 640 Adventure owners, sign in please...

Discussion in 'Thumpers' started by creeper, Feb 20, 2004.

  1. mgorman

    mgorman Crashing since 1964

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    Must have missed your original post on the subject. I have a set of spacers available that lowers a 640 with USD forks 2" and cut down front springs. The spacers are installed inside the forks and shock to shorten them (not fully extend). If someone wants to pay the shipping, they are welcome to them. Best installed when you need your suspension rebuilt.
  2. bmwktmbill

    bmwktmbill Traveler

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    Are the springs OEM or are they are heavier weight springs.
    I would be interested if they are heavier wt. cut downs...I realize cutting OEM makes a heavier spring but I need more.
    bill
  3. mgorman

    mgorman Crashing since 1964

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    The previous owner was a 140 lb flyweight so I doubt it. The plus side, if the spring is cut, it automatically increases the rate since there are less coils to compress to move the same distance
  4. Low594

    Low594 Adventuring Creep

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    Damn, I'd be interested, but I've got the conventional 50mm.
  5. bmwktmbill

    bmwktmbill Traveler

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    Yep, got a set of OEM's cut 2 inches...better but I still see excessive sag fully loaded.
    bill
  6. bmwktmbill

    bmwktmbill Traveler

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    Go Low.
    bill
  7. Hipster

    Hipster Long timer

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    Bill,
    How much heavier are you looking for? I have stock length .48 and .54 kg/mm springs springs from my KTM 990 (465mm length).
  8. bmwktmbill

    bmwktmbill Traveler

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    One step heavier than OEM would get the front end up enough, I think.

    I forget what the OEM wt. was in 2002 for the Adventure?
    Anyone?
    bill
  9. gunnerbuck

    gunnerbuck Island Hopper

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    2002- 2003 OEM springs were .44s... The 04-07 Adventures went to .46s when they took on the 950 front end...

    I swapped some .46s into one of my bikes and that helped a lot to get rid of the pogo effect that the .44s gave... I have .48s in the other bike and they make the front quite stiff, but still worlds better than the OEM units...
  10. warewolf

    warewolf Tyre critic

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    I'm pretty light at 70kg but the 2005's 4.6s were too light for me, I swapped in 4.8s from a 950 and it is perfect! Totally transformed the front end having the correct springs.
  11. warewolf

    warewolf Tyre critic

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    Yes, because a coil spring is simply a conveniently-packaged lever. Shorten a lever, and we all know what happens, right? Stiffness increases.
  12. SCsurfer

    SCsurfer surfing explorer

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    I have the stock set off my '07 you can have.
    Paul
  13. gunnerbuck

    gunnerbuck Island Hopper

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    70 KG was the target rider weight for the stock springs, you must ride pretty hard... The 2005 bike is only about 8 LBS heavier {most of it un-sprung} than the 03 so overall there should not be much difference in that respect...

    My observations:
    44s: blew through the travel much too easily and also bottomed often..
    46s: Made best use of all the available travel without frequent bottoming...
    48s: Spent most of the time in the top 1/3 of the stroke, rarely bottomed and even felt a bit harsh for everyday riding...
  14. bmwktmbill

    bmwktmbill Traveler

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    My observations:
    44s: blew through the travel much too easily and also bottomed often..
    46s: Made best use of all the available travel without frequent bottoming...
    48s: Spent most of the time in the top 1/3 of the stroke, rarely bottomed and even felt a bit harsh for everyday riding...[/QUOTE]

    Thanks for that Gunner and to those who offered their springs.
    Guess I'll stick with what I have...with the ADV posted revalve the ride iis plush and does not bottom..
    bill
  15. tileman

    tileman Been here awhile

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    Hi All.

    I'm just sorting some parts on my new(used) 640. I had a motomaster disc not being used and I decided to swap it over. The disc OD is the same and the swap was easy.

    BUT. Now the front is making a weird clicking noise when being wheeled around the shed after the swap. The original front disc was just over 4mm thick and the M/M is just under 5mm. Is the new disc just to wide?

    [​IMG][/IMG]

    Has anyone else used such a disc? I got it with some other parts from a 950se. Motomaster doesn't list a disc for the 03 model. The metalgear site lists a option but it is only listed as 4mm thickness.

    http://metalgear.com.au/mgear-brake-disc-front-left-p-6772.html
  16. warewolf

    warewolf Tyre critic

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    Maybe, maybe not. Aside from the poor handling, I just could not get decent sag numbers. Opposite of the rear, which is too stiff. What my suspension guru said was that all those guys that have disappeared off the top-level competitive circuit are now KTM test riders. Not only do those guys prefer a stiff rear and light front - because that is best when you have the throttle open all the time - but from a sales & marketing point of view, when you have a choice of two then generally it is better to bias the front light and the rear hard. Seems to stack up to me, with the caveat that having raced from the same pit as Chris Birch, seeing just how blindingly quick he came past me on the track, and the attitude he had the bike under brakes on a whooped-out downhill (basically back wheel at head height waving in the air near full-lock), I completely understood when he said "they are badly under-sprung at the front for quicker riders". So I dunno what sort of terrain KTM test riders are on, but Chris thinks they are soft at the front on the sort of terrain I ride on. Admittedly we were on two-stroke EXCs at the time, but the theory seems to hold.

    Not my bike :D There's 8lbs of unnecessary crap sitting in a box on my garage shelf.:lol3

    To add my observations to yours:
    44s: blew through the travel much too easily and also bottomed often..
    Haven't tried.
    46s: Made best use of all the available travel without frequent bottoming...
    As per 44s above, and harsh because they moved too much so the damping kicked in hard.
    48s: Spent most of the time in the top 1/3 of the stroke, rarely bottomed and even felt a bit harsh for everyday riding...
    As per 46s above, and plush because the spring is supporting the bike and the damping matches it.

    Dunno why that is so different between years? :scratch
  17. Low594

    Low594 Adventuring Creep

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    Can you shake the outer disc?? Looks like the new one is a floating disc, when the old is solid. If so you now have a floating caliper and a floating disc, which I suspect wont work well together!
  18. gunnerbuck

    gunnerbuck Island Hopper

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    I guess it is up to individual tastes, a lot of guys bump up to 50s and 52s on these bikes and some also go with revalving to get the results they desire... You do have a different set of forks on your bike from the 950s,but it's likely that the valving was changed to something similar to what the 03s run..

    I don't race the bike and have stock damping up front, so ballpark is good enough for me... Out back I bumped the shock spring up one size stiffer on a revalved unit and it seems to match up pretty good with the front... With the stock valving the front end has a bit of chatter on the ripples when running light.. On the flip side, I do find is that my suspension gives the smoothest most comfortable ride when I'm loaded up for travel and that chatter felt on the ripples is much less prevalent...
  19. tileman

    tileman Been here awhile

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    What I didn't know!!!!! Thanks, maybe I'll have to put the old disc back.
  20. Low594

    Low594 Adventuring Creep

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    It does look pretty cool! And it could be that it is just designed as a non-floating 2-piece rotor. I've seen them, but all of them were cheap materials, think Bling-Bling. Definitely warrants a closer look and maybe contacting the manufacturer. The pic seemed to have a part number!