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CB900 Cafe Racer project

This is a discussion on CB900 Cafe Racer project within the Project Builds forums, part of the Caferacer.net Forums category; Yeah - this is going to be a problem:...

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Thread: CB900 Cafe Racer project

  1. #261
    Senior Member hillsy's Avatar
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    Yeah - this is going to be a problem:

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  2. #262
    Member tjurek51's Avatar
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    Answer: Chain Tensioner; going with sprocket style. My bike shop says even this distance may not be a problem, but doesn't hurt to have one.

  3. #263
    Senior Member TrialsRider's Avatar
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    Time to find a new bike shop
    8ball likes this.

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  5. #264
    Member tjurek51's Avatar
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    you know, most older triumphs had 6-7" distance between sprocket and pivot point. most pictures I saw showed them without a tensioner. most of my research says if the distance is under 9" tension is not much of an issue. I'm still installing one anyway.

  6. #265
    Senior Member hillsy's Avatar
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    Quote Originally Posted by tjurek51 View Post
    My bike shop says even this distance may not be a problem
    Of course they would say that - how much have you spent with them so far on this thing?

  7. #266
    Member tjurek51's Avatar
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    By "Assemble the Bike" I mean... put the backend together...
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    With a small glimpse of the potential of what it could look like...
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    may need to modify the crank case a tiny bit to ensure the lower chain travel is unencumbered. It appears I may have some issues with positioning the new rearsets. will post on that later.

    - - - Updated - - -

    more that anticipated, but not much

  8. #267
    Junior Member DannyKZ's Avatar
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    With the tank and seat, I can see where you're going here.

    If you get yourself a long piece of 1/2 inch or 3/4 inch thick delrin about 2" wide by 8" long... you could make a "slider" cover for the swing-arm to prevent the top of the chain from sagging and garring up the swingarm.

    You could also work-out a tensioner from the front-side of the swingarm above where the peg mounts. It would keep it tucked out of the way.

  9. #268
    Senior Member Cyorg's Avatar
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    Quote Originally Posted by tjurek51 View Post
    you know, most older triumphs had 6-7" distance between sprocket and pivot point. most pictures I saw showed them without a tensioner. most of my research says if the distance is under 9" tension is not much of an issue. I'm still installing one anyway.
    In addition to wondering how your chain and tensioner are going to react under compression braking on bumpy roads... I wonder what sort of squat you are going to end up with and what that will do to your line when navigating corners at speed. Before you stuff it into any corners, you might want to ride it somewhere sans traffic and trees to see if it has any bad habits.

    edit... we should probably stop referring to it as a chain tensioner, because it looks like it needs to be more of an idler sprocket to change direction of the chain and guide it around the frame cross member and swing arm. Its hard to tell from the photos, but a spring loaded tensioner might be a recipe for trouble if it has too much travel. If under decel, it allows enough slack that the chain can climb the drive sprocket.... it might ruin your day.
    Last edited by Cyorg; 05-19-2017 at 01:13 PM.
    "Non urinat in ventum"

  10. #269
    jcw
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    Senior Member jcw's Avatar
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    Or you could have started with the right bike...

  11. #270
    Member miniman's Avatar
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    Quote Originally Posted by jcw View Post
    Or you could have started with the right bike...
    To be fair I'm enjoying the engineering that has gone into solving this (even though as you pointed out there was an easy easy around the problem).
    Already proved a lot of people wrong by getting this far.
    I haven't got half the patience or money to solve a problem that didn't exist in the first place hahaha.

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