Another CRF1000L fork thread!! Reg vs Adv Sport forks.

Discussion in 'Japanese polycylindered adventure bikes' started by Motociclo, Oct 22, 2018.

  1. Motociclo

    Motociclo Long timer

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    Cheers.
    With some luck, new bits will hold up.
    That would be a good mod using DRZ forks.
    Keep us posted.
    I looked into SSS option and getting triples and axle boots made so as to keep twin disc and make forks plug and play. But the cost. Too much.
    #61
  2. madafakinges

    madafakinges SUPERENDURO

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    27459387_1508491012583216_5588825278108806941_n.jpg 35241501_1637668376332145_6186334506471915520_n.jpg 35223975_1637668442998805_157548260934811648_n.jpg 20140167_1331935950238724_7335886443329641687_n.jpg
    Italian tunner RBracing made this adapters to fit crf450 fork into Africa Twin
    #62
  3. yokesman

    yokesman Long timer

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    RB racing googles in the US as a HD shop, any links?
    How are the ATAS forks doing, thanks for the updates and info.
    #63
  4. madafakinges

    madafakinges SUPERENDURO

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    Find them on Facebook
    #64
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  5. madafakinges

    madafakinges SUPERENDURO

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    I have change oil from 10w to 5w becouse it was too stiff when offroad. But now is winter... im not riding maybe in sunday i will take it for test ride.
    #65
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  6. Motociclo

    Motociclo Long timer

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    #66
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  7. Motociclo

    Motociclo Long timer

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    Finished swapping over fork bits.
    Substantial difference between reg af twin outers and adv sport outers.
    20190317_154029.jpg

    Have installed Teknik oil locks also.
    The circlip that locates on shaft, i have cut in half. I use rubber grease to hold in groove until the lock halves hold it captive.
    Is better than trying to get clip over thread and down shaft.

    20190307_133911.jpg
    20190307_133927.jpg

    Gone back to 10wt oil. Have done another revalve to suit also.
    And gone to slightly light 0.78 fork springs.
    Don't need to shim the slide bush. 0.15mm clearance. Same as what i have with current forks after installing 0.05mm shim.
    The outer tube has same ID as current tube. The obvious guess is the groove the bush sits in, has slighty larger OD, in the order of 0.10mm. I used shim to achieve same thing.

    Will report back after ride.
    #67
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  8. BLU_FZ1

    BLU_FZ1 Been here awhile

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    Watching with interest
    #68
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  9. MillennialFalcon

    MillennialFalcon Improvement starts with self

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    Obvious question: is Italian company selling fork conversion bits?

    Thanks again for all your work on the AT forks, Motociclo.
    #69
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  10. Motociclo

    Motociclo Long timer

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    Don't know. I will look into it.
    I flicked an email. Will see what returns!!

    No worries. Happy to help.
    #70
  11. xr650rRider

    xr650rRider Adventurer

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    What part number for oil locks?
    #71
  12. Motociclo

    Motociclo Long timer

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    #72
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  13. RustySpokes

    RustySpokes Ordinary average guy Supporter

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    You know it just occurred to me that Emig racing makes conversation triple clamps for a number of bikes. I think they use the entire front end from a motocross bike and their clamps to adapt them to DR650’s, KLR’s and some BMW’s. I’ll take a look at their website and report back...

    http://www.emigracing.com/

    Edit: Didn't see anything on their website but sent them an email.
    #73
  14. xr650rRider

    xr650rRider Adventurer

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    #74
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  15. Dillo

    Dillo Almost Awesome

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    You can get fork conversion bearings from All-Balls to allow you to take the forks and triples from another bike but it relies on the steering stem being close enough to the same length on both bikes.
    #75
  16. Motociclo

    Motociclo Long timer

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    Gave new forks a shakedown.
    Tried to cover as much variation in terrain as possible.
    Forks feel a bit more stout on tar alone.
    Turn in a little quicker.
    There is noticably a lot less flex.
    I noticed this most on corrugations.
    The high frequency of corrugations used to make old forks flex like crazy. Front wheel looked like a pendulum. No feel, just flex.
    These new forks, much better. There is still a degree of flex, but so much less. SO much less.
    Corrugations through corners didn't make bike run wide, just track through nicely.
    On a short roughish single track section, could feel forks are much more rigid.
    Under hard braking, more so on the tar , i could better feel what front tyre was doing.

    Hopefully these outers are up to task. My thoughts are flex has a big contribution to the wear issue. These don't flex much.

    I stripped my old forks to measure wear parts. No wear. 30k km on bush kit, no measurable wear. Funny or sad really!!!

    Overall, quite happy with how this has turned out.

    To recap on previous posts to anyone unsure.
    The adv sport outers, and lower legs are a direct swap with reg af twin. Zero mods. 100% compatible.
    The bush and seal kits, also 100% compatible.
    The major differences between the 2 fork types,
    1. Damper cartridges are different. Thats how adv sport achieves longer travel. This includes rebound needle.
    2. Adv sport has longer springs.
    3. Bush on lower leg is 29mm higher than regular Af twin. This difference does not affect compatibiliy.

    Every thing else is a straight swap.
    Hope this helps you guys and gals considering this option. Ohlins maybe the best. Swapping out with twin chamber KYB or Showa forks another.
    But this hopefully will be an affordable, mod free option that will work.
    10k km from now. I will strip and review.
    That will be on going.
    #76
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  17. leexc

    leexc Been here awhile

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    I did not read the whole thread just bits but when I saw the word overlap in the first post I knew we were thinking along the same lines.
    I have an ATAS that is fairly standard but with narrow rims on standard hubs to take desert tyres with mousses, I used it in the 2018 Sahari rally in Algeria and then the 2019 africa eco race, I had massive problems hitting rocks it seems the forks were locking especially on the babies head size rocks in morocco, I was aware of the 16/17 AT forks problem and out of desperation tried touching the front brake just before hitting a rock (the last thing you would normally do) to give the forks more overlap and maybe less chance of locking, It seemed to work at least to an extent but it is difficult to ride with your hand on the lever for mile after mile on big rocks.

    Just yesterday we pulled the forks out of the bike and tipped the oil out, I was expecting to find something broken or bits in the oil like people have found in there 16/ 17 bikes but nothing and in fact the oil was very clean especially for a bike that has done about 8000 kms of desert rallys.
    I also had problems with the front end washing out in very soft sand and an understeer feel but because I have no plans to return to the desert I am going to see how it is in the terrain we have here in the uk.
    #77
  18. Motociclo

    Motociclo Long timer

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    You have given it work out. Re assurung that firks have held out given what riding you have done. I have taken my Twin on some roughish single tracks etc. Not often. Normally my riding is much more sedate.
    Good stuff.
    #78
  19. africa twin

    africa twin Been here awhile

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    #79
  20. Motociclo

    Motociclo Long timer

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    I haven't found out what adv sport fork spring rates are. Unlikely to be much higher than regular af twin rate though, (if at all), which is 0.55/0.56.
    Just as easy to get aftermarket springs.


    Edit, Adv sport spring rates,( forks and shock ), are the same as regular Af twin. Did some investigating.
    #80
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