KTM 500 EXC - Converting to Cush Hub

Discussion in 'Thumpers' started by mdlafferty, Dec 14, 2016.

  1. RideFreak

    RideFreak Torque Junky

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    I saw the seller from another guy who posted the link. Most of the anodized hubs are made in China which is what these are. Once thing I noticed, the seller states that the parts are 100% compatible with OEM. I take that to mean spokes, bearings and seals. Not all rim sets are like that.
    #21
  2. massholejim

    massholejim Been here awhile

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    Warp nine hubs I believe are made in the usa wheels I believe Japan spokes everything else not sure I do know the hub seams to be sealed well .
    #22
  3. Droptarotter

    Droptarotter Long timer

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    Just sent you a pm...........come on over and try a 640 wheel on your bike!

    You bring the beer!

    Merry Christmas.
    #23
  4. SRG

    SRG Long timer

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    Can anyone tell me/measure the width of either/or:

    1) Space between sprocket side of the swingarm and the brake caliper carrier (inside dimension).

    2) Width of assembled 640 cush hub, including spacers.

    These 2 have to be very close, no? #2 slightly less than #1? +_180mm?
    #24
  5. mdlafferty

    mdlafferty Adventurer

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    To conclude this topic for me, I'm 99% sure that the 640 cush hub will fit. It must use the 20 mm axle.
    I did not use an OEM KTM wheel but ended up buying a new wheel with cush hub from Haan. It fit. The label on the wheel is "KTM LC4 (20mm)".
    IMG_3125.JPG IMG_3130.JPG
    #25
  6. Ryno041

    Ryno041 racer -> adventurer

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    is this for a 2.5 inch rear rim that is black with silver hub?
    #26
  7. Honkey Cat

    Honkey Cat Tailights Fade!

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    DR 650 rear wheel
    #27
  8. LexLeroy

    LexLeroy Socially Distant Supporter

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    Yep. Use the 220 mm rear disk from a 1997-1999 DR350SE (69211-03D10), a 520 rear sprocket from various different Huskys (JT Sprockets - JTR822.x), adjust the outside spacer widths as required and you're in business - assuming that there's enough room in the swingarm. Here's one w/ an 18 x 2.5 rim adapted to a Honda XR650L, although it required a bearing swap to accommodate the Honda's 17 mm rear axle.

    [​IMG]

    Works fine and Suzuki parts will probably be around forever.
    #28
  9. Ryno041

    Ryno041 racer -> adventurer

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    So I did some research myself. I own a 2016 Husky FE501S and Wanted a cush rear wheel for longer Dual sport trips. After reading this thread I concluded that the 640 wheels will work, But I wanted a black rim, not silver. I think the 640 enduros came with silver rims, 640 ADV's came with black rims. (I could be wrong here but a google image search semi confirms this)
    So here is what I just ordered
    5821000104430 - Rear Wheel Cpl. Black '04
    58310050144 - Sprocket Support Cpl. 03
    54610459000 - Rubber Damping Block '91 (x6)

    Here is the link I found the part numbers off a 2005 640 ADV
    http://www.ktmpartspitstop.com/oemparts/a/ktm/524b7a39f8700231ac496456/rear-wheel-damped-18

    My parts should be in 3-5 days from now. So I will report back and let you all know how it goes.
    #29
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  10. Honkey Cat

    Honkey Cat Tailights Fade!

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    Or put your money into a rekluse and I have to believe this is as good as having a Cush hub.
    #30
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  11. Honkey Cat

    Honkey Cat Tailights Fade!

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    I had put a ktm wheel on my dr650. Only thing I had to do was lathe spacers a little
    #31
  12. Dao1

    Dao1 Long timer

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    the rekkuse releases engagement at very low rpm, like under 2500~1500rpm, depending on how it's setup by user. once rpm is
    above that, there is positive clutch engagement, same as a manual clutch.

    Thus, shock loading has already been passed through all the transmission components.

    The cush hub is still the best method for damping out all the shock loading coming from the rear tire used on pavement.
    #32
  13. RideFreak

    RideFreak Torque Junky

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    Also for smoothing out driveline snatch.
    #33
  14. Ryno041

    Ryno041 racer -> adventurer

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    Ya, that's what I intend on using the Cush hub for. I only want it for longer dual sport rides and desert rides. I blew up a tranny once in one of my past race bikes from fast paced desert whoops.
    Also, I'm not sure if everyone knows here, but I recently found out these bikes (at least my 2016 FE501S) have rubber damped clutches. It has little rubber blocks similar to what Cush hub ones look like only much smaller. I was told by mechanic that they relieve the drivetrain "surge or pulse' while riding on asphalt.
    #34
  15. RideFreak

    RideFreak Torque Junky

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    They do to some extent, you'll feel it improved even further with a cush wheel.
    #35
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  16. Ryno041

    Ryno041 racer -> adventurer

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    That's what I'm hoping for, and I don't think I'll ever put a recluse on one of my bikes. For the riding I do and my skill level it makes no sense
    #36
  17. miksu

    miksu Been here awhile

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    I used to have cush hub supermotos and 18" rear from adventure. Never used them since I go rekluse. IMO cush hub is a waste of money, just get rekluse instead.

    The rubber dampers in the clutch work as well and further diminish the need for a cush hub. Although z-start pro does away with those, but that is not a big deal.

    It would take pretty extensive research to determine what actually is the most harmful shock and vibration for the bike. Most people only care about rider comfort because they have found the bikes never fail anyway.

    Cush hub is an effective method to smoothen out the entire range, but rekluse does a better job smoothing out the peak forces. Rekluse does clearly slip up to pretty high revs. You can stick a camera to record chain movement and try, with rekluse you will notice chain always stays tight at full throttle. Slippage probably only some degrees each power stroke and happens at the very peak hit. It seems to have no effect on the clutch life and calculations confirm this. I, however, have not logged the actual gradual slippage angle vs. peak pressure. That would take more sophisticated dataloggers than I am comfortable with sticking to a dirtbike.
    #37
  18. Ryno041

    Ryno041 racer -> adventurer

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    Clutch disengages motor from tranny, so the rubber dampers in stock clutch and recluse do not protect your transmission or driveline like a Cush hub does
    #38
  19. RideFreak

    RideFreak Torque Junky

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    I don't have a recluse and don't want one.
    #39
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  20. Duzitall

    Duzitall old dude

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    Me either, and a Rekluse clutch has nothing to do with a Cush hub. I do want a set of wheels with 50/50 tires for my EXC.


    Sent from my iPhone using Tapatalk
    #40