Busa USD swap
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  • 1 Post By beestoys

Thread: Busa USD swap

  1. #1

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    Busa USD swap

    Hi, I just bought gen1 hayabusa usd fork. I'm trying to find info/guides about fitting that. All I've found for now is that upper bearing should be changed to size 30x47x15.. I found couple of possible solutions

    https://www.allballsracing.com/99-3540-5.html this is listed as fork swap bearings but the size is 30x47x12..

    http://www.twfracing.com/PartsPages/...adbearing.html this was found from some thread and shold be suitable, only thing is that twf doesn't tell the bearing size

    So I was just wondering that if someone has used one of these manufacturers and can tell if they are ok. Or is there some else manufacturer who sells suitable bearing? I've been searching couple of hours and can't find any.. thanks

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  3. #2

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    Re: Busa USD swap

    I used this top bearing - https://www.ebay.co.uk/itm/Tapered-r...-/291457610520

    But - you need to put a 2mm spacer ring under the bearing or the inner race will rub on the headstock casting.
    Last edited by CBRDEAN0; 08-13-2019 at 5:26 PM.

  4. #3

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    Re: Busa USD swap

    You can pull the stem. It presses out from the top. There is a lock ring so don't try pushing in out from the bottom side. Once it's out you can have the top of the spindle remachined to accept the stock BB top bearing and spanner nuts
    adeyren likes this.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

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  6. #4

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    Thank you for your answers! I think I will order that pyramid bearing. In future I'm going to buy different yolks to widen the whole fork so it might be better to do stem modifications then.

    Is there spacing rings for sale somewhere or did you made one by machining?

  7. #5

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    Re: Busa USD swap

    Do a thread search here. There are more than a few if us that have made the conversion. There is enough info between all of these to make a swap fairly painless.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  8. #6

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    I can tell you that I've done so many searches here and other forums. The problem is that I don't speak english in my native language so maybe I can't find right keywords and so on.. it's a pain in the ass to search many and many hours information when someone who knows the answer can just aswer.. 🙄😅

    These kind of ordinary swaps etc should be under of one thread in some mods section or something like that

  9. #7

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    Re: Busa USD swap

    Tony, ask away, bees, Deano and myself have done the swap.
    20190428_164045 (Large).jpg
    carpe diem

  10. #8

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    I think theres no questions anymore, if original bottom steering head bearing fits busas stem then everything is ok. I was just asking if theres that 2mm spacer for sale already somewhere because what I've read that upper bearing size needs to be exactly the same (30x47x17) in many usd swaps between different bikes. Would be so easy to just order that from ebay than go to machining shop and pay multiple times more than from ebay when its done mass production 🙂

    Bike is going to be naked so nothing to worry about hitting fairings or lenght of cables and so on because they are going to be new anyways

    Steering stops probably will not work with bird but I'll figure out something with that

  11. #9

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    Re: Busa USD swap

    Tony
    Unfortunately there isn't a bolt on kit. Delano has installed a gen 2 using all the Busa parts. As mentioned the only hitch is the upper bearing. I've done 2 here at my shop. But I designed and had a billet top hat made that allows the use of the Busa bar assembly or can adapt to straight bars as well you just have to get the correct base mounts. Then you can press out the shaft and have it cut down and threads cut as I stated to allow the use of the factory castle nuts bearings seals and spacers. The gen 2's are as stated 3/8 of an inch shorter than the stock BB length but Deano has a fix for that as well. I haven't made that change yet because a suspension specialist I know wants to see where the system is with a special suspension analyzing program he uses. The gen1's match length wise but the 6 piston calipers need a second gen master to have at least the same feel as the original BB front brake.
    Delinking will require you to change out the rear master as well. You can use one from a cbr600 it's a bolt on with the exception of having to shorten the pedal linkage to get the pedal back up in height.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  12. #10

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    Re: Busa USD swap

    bees, you using the cbr 600 rear master? I use a NSR125 one and i believe Deano uses a CBR300 one. Both need a different banjo bolt. Both equally as good.
    carpe diem

  13. #11

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    Re: Busa USD swap

    Yep
    Everything bolts right on. Actually kept both lines as well so I'm using all 3 pistons. Wow does it take a little adjustment on how much pedal I need now
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.


 

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