DR650 Cush Drive Bearings

Discussion in 'Thumpers' started by BergDonk, Apr 7, 2011.

?

How's your > 96 DR650 Cush Drive?

  1. Lateral movement of sprocket 0-1 mm

  2. Lateral movement of sprocket 1-3 mm

  3. Lateral movement of sprocket 3-6 mm

  4. Lateral movement of sprocket > 6 mm

  5. Bearings changed @ < 5,000 kms

  6. Bearings changed @ < 10,000 kms

  7. Bearings changed @ < 15,000 kms

  8. Bearings changed @ < 20,000 kms

  9. Bearings changed @ > 20,000 kms

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  1. motolab

    motolab Long timer

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    Yes.
    That would involve the customer boring (or organizing boring) the inboard bore, which has to be coaxial to the existing bearing bore (I use a 6-jaw adjustable chuck and true until the needle on a .0001" reading dial indicator does not deviate at the adjuster positions), and have a diameter precise enough to achieve the correct press fit.
    I suppose they could be offered on an exchange basis, but they would have to be done in batches to get the price down (by using each setup multiple times instead of once).

    Regards,

    Derek
    #61
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  2. thump!

    thump! Adventurer

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    I'd likely be interested if we can get a batch going. What would you consider a minimum batch and given said batch, what would the price be?
    #62
  3. LexLeroy

    LexLeroy Nerds Rule

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    Please let us know how that inboard bearing works out. I like your approach because it places the bearing's center line as far away from the outboard bearing's center line as possible and because it preserves most of the spigot's thickness. The pressed-in sleeve may add strength to the spigot as well.
    #63
  4. BergDonk

    BergDonk Old Enough to Know Better

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    My latest iteration vs stock:

    [​IMG]

    [​IMG]

    I'm still using a 4205s in place of the stock 6205s and I still have a 3804 in play. I also have another hub setup with a 37 mm OD needle roller bearing 4904 2RS needle roller in the spigot. Its been going fine too, with a lot more bearing area than the 3804. My 3rd iteration, above, uses a pair of 6904s with a longer sleeve in the spigot which are a fraction of the price of 4904 and much stronger than the 3804. I think this is my 'final solution' :jack

    Derek's solution does make for a thin spigot, but likely not an issue, time will tell I expect.
    #64
  5. motolab

    motolab Long timer

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    I don't expect it to be an issue because the way I designed it, the spigot does little more than provide a place to install a seal.

    Regards,

    Derek
    #65
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  6. phreakingeek

    phreakingeek adventurer

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    Hope to have some input on my cush hub that Derek modified for me in the next month or so. I am putting on the modified cush hub and will do a shake down ride this weekend. If all goes well, I'm heading out on a TAT ride on 7/15. By my best guess I'll have nearly 7k miles on it before all is said and done. I will have a backup cush boxed up and ready to ship overnight just in case, but doubt I will even have to think about it.
    #66
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  7. Halifax614

    Halifax614 Misadventurer

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    #67
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  8. phreakingeek

    phreakingeek adventurer

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    After 3.5 weeks riding the TAT with my modified stock cush hub...over 6k miles through rain/mud/sand/dust/deep water, I finally had an opportunity to check and see how my bearings are holding up.

    The modified cush hub/sprocket carrier has no measurable play (by me and my small set of garage 'instruments'). My stock setup would normally be ready for new cush rubber and potentially new cush bearing after that long and abusive ride...but I am unable to measure a difference between the one with 6500 miles and the spare one.

    I am going to keep going and see provide a long term test with the current hub configuration. As it stands, I couldnt me more happy with the way this hub is performing. If you're like me and do not have the skills or tools to do the machining work, reach out to Derek at @motolab .



    #68
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  9. thump!

    thump! Adventurer

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    @derek, has anyone else shown interest in this? I, for one, would like to pursue it. With winter down time coming for many owners I'm thinking we might be able to get a "batch" going. I have a spare hub that I could send anytime.
    #69
  10. motolab

    motolab Long timer

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    Not really.
    I can certainly do one for you.

    Regards,

    Derek
    #70
  11. phreakingeek

    phreakingeek adventurer

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    @motolab
    Derek,
    Just swapped out my modified cush to the warp9 'backup'. Planning to get the two modified hubs shipped out your way for your assessment of wear. Hopefully my dubiously calibrated eyeball measurements will be justified when you get a chance to check the play.

    thanks again, I love the work you did on my hubs.
    #71
  12. thump!

    thump! Adventurer

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    PM sent
    #72
  13. motolab

    motolab Long timer

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    I haven't gotten anything yet. Did you send them?
    You're welcome, and thank you!

    Regards,

    Derek
    #73
  14. phreakingeek

    phreakingeek adventurer

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    Just to follow up for the folks following along.

    Took me a while to get the cush hubs shipped out to Derek @motolab but it finally happened. He measured the two modified cush hubs (one was used for 6500 miles on my TAT ride and the other was un-used).

    Derek sent me the results:
    "What I did was a shake measurement next to the sprocket centering edge. The results were 0.0035" (0.089 mm) for the unused one and 0.005" (0.127 mm) for the used one"

    After seeing the numbers, I realized that the only way to really know for sure that the double bearing mod is a worthwhile upgrade would be to measure a brand new stock cush hub and then again after 6500 miles of riding. Once we have all 4 measurements, it will show a little better if the mod improves durability or decreases wear.

    Anyone want to ship their hub to Derek for a quick measurement? I'll cover the shipping and labor if you dont mind being sidelined for a week or two. Or, once I get my modified cush back on the bike, I'll loan you my Warp9 cush hub while you send in your stock cush. We need one that's brand new or very low mile and one with approx 6500 miles. (probably not going to be a real accurate test since chain tension, weight of rider and gear, and type of terrain do play a big role in wear...but I'll take it)
    #74
  15. Belgradian

    Belgradian Been here awhile

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    I have a new hub on order, but it will be about 12 days out. I'd sure send it on to Derek @motolab for measurement and alteration. What bearings should I order?
    #75
  16. DR Steve

    DR Steve Been here awhile

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    Good to see a few inmates fixing this issue on their DR's.

    Just to add another data point, I'm still using the same NA49042RS needle roller bearing and stock 6205 2RS bearing that I fitted when originally doing this modification 5 -6 years ago. Must have about 50 K on it now. I inspect the hub every time I have the wheel off and it's still good.
    #76
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  17. motolab

    motolab Long timer

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    I've got the bearings and seals covered.

    Regards,

    Derek
    #77
  18. Belgradian

    Belgradian Been here awhile

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    Great, I'll contact you Derek when the hub is here. Thanks.
    #78
  19. motolab

    motolab Long timer

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    Sounds good.

    Regards,

    Derek
    #79
  20. LexLeroy

    LexLeroy Nerds Rule

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    I followed your approach when I adapted a DR650SE rear hub to my XR650L. It's still tight and sweet, although I don't have anywhere near your mileage.
    #80