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Thread: Suspension questions

  1. #11
    Senior Member ancientdad's Avatar
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    Man, quite the story Jim - glad you took the time to share it. Can't say I've ever seen a bad manufactured front sprocket before... especially leading to all of that. Wow

    Hope all is back to normal with the post-surgery issues, and glad you're hearing things again
    Tom

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    running points... because I'm too old for mysteries that begin with pushing

  2. #12
    Super Moderator longdistancerider's Avatar
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    The 2nd CI has made a vast improvement, now I get directional sound. Word/speech recognition seems to have decreased some but I'm working on training the other half of my brain to recognize that, hours spent each day listening to speech. Basic rehab of training the brain to hear again.
    80cb400t and JamesPal like this.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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  3. #13
    Member Alexd's Avatar
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    Wow what a story, I will be looking at the front sprocket. Too bad can’t really find out if the tire is good.
    1978 CB 400 T2 Hawk

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  5. #14
    Member Alexd's Avatar
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    Pogoing is speed related, anything below 50 feel it between 50-60 smoothies out. I looked at rear tire and looks like it might be bead not seated right, I will try to break the bead and reseat it.
    longdistancerider likes this.
    1978 CB 400 T2 Hawk

  6. #15
    Junior Member ErNor's Avatar
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    Hi, I am experiencing the same pogo effect on my slightly scrambler modified 82 CM 400.
    Did you ever fix your pogo Alex?

    I have checked and rechecked tires, shocks, even bought a new front rim, but no change.
    I am running 19” K60 Heidenau front and 18” rear so I am suspecting that this could be the reason.

    Will definitely check front and rear sprockets.

    Any suggestions guys?

    Ernst

  7. #16
    Super Moderator longdistancerider's Avatar
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    I'll suggest swapping out the rear tire first and see if that solves it, then the front if it doesn't. See if your local bike/tire stores have any old ones laying around to use temporarily.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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  8. #17
    Junior Member ErNor's Avatar
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    Thanks!

  9. #18
    Member Alexd's Avatar
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    Hi, haven’t rode it for a bit. Took carbs apart again. I think I found the issue but haven’t been able to do anything yet. Looks like my rear tire is not seated perfectly in the bead. So when I spin rear tire it looks out of round. I will try to break the bead and reseat it and see what happens but first finish with carbs and seal the tank.
    1978 CB 400 T2 Hawk

  10. #19
    Junior Member ErNor's Avatar
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    @Longdistancerider. Thanks for the advice some weeks ago. Alex, Sorry to hear that your carbs are acting up.
    I was able to persuade a local dealer to “lend” me a pair of normal road tires and it feels better. It has significantly reduced both the vibration/pogo feeling and the floating sensation. However talking to a mechanic (he also sells stuff) he mentioned that old suspensions, even after being serviced and have correct spring length etc, can get stiction and this might lead to what I have described. The suspension is kind of frozen and not reactive on straits especially when the surface is good and this will create a vibration/floating feeling in the bike.
    He is recommending a set of progressive springs that will solve this without swapping the tires.

    Sorry for the long story...any comments to his advice and how to get rid of this stiction?

  11. #20
    Super Moderator longdistancerider's Avatar
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    Progressive springs won't cure stiction but they do make the ride more pleasant especially if you have them front and rear. The suspension shouldn't be overly stiff. The rear should drop @1" or so when you sit on it and if you bounce it should move some. The front end should also be able to manually move up/down with some effort.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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