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This is a discussion on CB77 Project within the Project Builds forums, part of the Caferacer.net Forums category; So is this the correct size bearings I'll need, according to the above measurements? Upper: 25 x 48.5 x 15 Lower: 27 x 50 x ...

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  1. #171
    Senior Member CaTacL1sm's Avatar
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    So is this the correct size bearings I'll need, according to the above measurements?

    Upper: 25 x 48.5 x 15
    Lower: 27 x 50 x 14.25

    Upper 550 tree inner diameter: 25
    Upper CB77 outer diameter: 48.5

    Lower 550 tree inner diameter: 27
    Lower CB77 outer diameter: 50

    The upper bearing is easy to find. The lower not so much. Would it work to use a 30 x 50 x 14.25 bearing and press a sleeve onto the lower part of the 550 stem to increase its diameter?
    Last edited by CaTacL1sm; 02-12-2017 at 07:26 PM.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  2. #172
    Senior Member hillsy's Avatar
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    How are you going to fit a 50mm OD bearing into a 48.5mm neck?

  3. #173
    Senior Member CaTacL1sm's Avatar
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    Quote Originally Posted by hillsy View Post
    How are you going to fit a 50mm OD bearing into a 48.5mm neck?
    that was a typo.

    The CB77 has a 50mm neck

    Thinking more, the lower bearing can use the stock 48mm gt550 one with a 2mm spacer pressed into the cb77 neck
    Last edited by CaTacL1sm; 02-12-2017 at 09:15 PM.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

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  5. #174
    Senior Member hillsy's Avatar
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    Quote Originally Posted by CaTacL1sm View Post

    Thinking more, the lower bearing can use the stock 48mm gt550 one with a 2mm spacer pressed into the cb77 neck
    You mean a 1mm spacer....which is pretty thin.

    If you can spin the stem up in a lathe you might be better off building the stem up with weld and machining it to 30mm.

    Either way you look at it, you'll be dealing with a 1 or 1.5mm spacer which will be pretty hard to machine up or may crush with the interference fit of the bearing.

    Wouldn't be a problem if it was the top bearing but the lower takes all the load.

    EDIT: You'd probably be best off waiting until you get the 550 triple so you can compare stem length as well - you might have other problems / options if the stems are different lengths.
    Last edited by hillsy; 02-12-2017 at 10:26 PM.

  6. #175
    Senior Member CaTacL1sm's Avatar
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    I'm fairly certain the stems are different lengths.

    Agreed that this whole problem will be best solved when I have the parts physically in hand.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  7. #176
    Senior Member CaTacL1sm's Avatar
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    So the triple tree and forks arrived today.

    I dropped off the tree with my machinist, along with the CB77 tree. The stems are the same length, so the plan right now is to swap the CB77 stem onto the GT550 lower, and modify the upper to fit.

    Things yet to arrive:
    -All balls CB77 tapered bearings (though I may look at cleaning up and re-using the tapered bearings in there already)
    -GT550 85kg/mm Race-Tech spring set (stole for $99 and free shipping)
    -Cartridge emulator from mikesxs that I can modify to fit
    -Fork Seal
    -1972 GT550 Axle
    -1973 GT550 Axle
    ^ordered both because they're cheap and it may be useful with the 72 drum and 73 forks

    -I can't find anywhere that sells new fork bushings

    So my next hurdle is this:





    The GT550 forks are 3.5" longer than the CB77 forks (yes it shows 4" in the picture, but the 77 fork wasn't fully extended).
    I don't want to change the geometry of the CB77.
    I'm ok with having an inch or two of the forks poking above the triple.

    This leaves me with a few options:
    1. slide forks up in triple as much as it takes to maintain steering geometry
    2. get shorter fork springs
    3. get shorter fork springs and cut down fork tubes/buy new/shorter fork tubes
    4. keep on-order race tech springs, machine forks down 15mm (amount of preload I'll be using), slide forks up triple tree

    I have some things to think about.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  8. #177
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by CaTacL1sm View Post
    ...
    -I can't find anywhere that sells new fork bushings
    ....
    Maybe it doesn't have any, we've seen a lot of bikes come through here lately like that.

  9. #178
    Senior Member CaTacL1sm's Avatar
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    Quote Originally Posted by TrialsRider View Post
    Maybe it doesn't have any, we've seen a lot of bikes come through here lately like that.
    Looking at crappy pictures of fork diagrams on the internet has led me to believe otherwise, but I wouldn't be surprised.

    once everything is apart I'll see whats in there and take any measurements. I may be able to find a solution in here:

    FMB-ForkBushings
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

  10. #179
    Senior Member hillsy's Avatar
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    You could probably take an inch or two off the forks this way:



    And then just slide the rest through the forks as required.

    The good thing is you now have some extra adjustment either way to dial in the handling

  11. #180
    Senior Member CaTacL1sm's Avatar
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    Honda Cappellini CB72 REBUILT timing chain tensioner 19T sprocket, wide, RH adj | eBay

    I need to control myself. I won't buy this until the bike has been ridden for the first time.
    I thought that a cafe racer was a custom that you could do whatever you wanted and there is no right or wrong.

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