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  1. #1
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    Dahon Helios Loose Stem( bottom locking part)

    Hi guys,
    was just given a used, but in excellent condition dahon helios bike. Reason for giving it away is that the stem at the very bottom locking mechanism( the one circled in the picture) is loose, so it is turning left or right with just applying small effort, which makes it dangerous to safe as as on as I try to steer, only stem goes in the desired direction, but wheel is keep going straight. I think it is the bracket that has an allen bolt on it( the one you use to fold the stem), but problem is that I can tighten it all the way. There is still about a 1mm gap between the two parts of the bracket, so they don't join completely. I tried to tighten as much as possible, but it doesn't allow me to tighten it all the way. But when I tighten it as much as possible, you need to apply much more pressure in order to turn the stem. Which makes me think that that bracket is the problem. The allen bolt looks a bit short( not sure if that how is meant to be), because when tightened it doesn't go all the way to the end of the thread. So i am wondering if replacing it with a longer one will allow me to tighten the bracket all the way so that both ends can join. Cheers

    helios.jpg

  2. #2
    Senior Member ThorUSA's Avatar
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    Quote Originally Posted by petko8680 View Post
    Hi guys,
    was just given a used, but in excellent condition dahon helios bike. Reason for giving it away is that the stem at the very bottom locking mechanism( the one circled in the picture) is loose, so it is turning left or right with just applying small effort, which makes it dangerous to safe as as on as I try to steer, only stem goes in the desired direction, but wheel is keep going straight. I think it is the bracket that has an allen bolt on it( the one you use to fold the stem), but problem is that I can tighten it all the way. There is still about a 1mm gap between the two parts of the bracket, so they don't join completely. I tried to tighten as much as possible, but it doesn't allow me to tighten it all the way. But when I tighten it as much as possible, you need to apply much more pressure in order to turn the stem. Which makes me think that that bracket is the problem. The allen bolt looks a bit short( not sure if that how is meant to be), because when tightened it doesn't go all the way to the end of the thread. So i am wondering if replacing it with a longer one will allow me to tighten the bracket all the way so that both ends can join. Cheers

    helios.jpg
    I would give you qa link to my site, where it explains how to adjust the handlepost, BUT some moderator would surely bann me again ....
    which is silly as others in the industry have their homepages listed in the signature and freely make advertising for their brand... but I digress..

    somebody els will find the link under technical ... dahon recall ... and surely post it for you
    thanks thor
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  3. #3
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    petko8680 - There is some good technical information on Dahons and Terns available at Technical.

    -HANK RYAN-
    Norman, Oklahoma USA
    DISCLOSURE: I have an ownership interest in an independent bike shop that is an authorized dealer for Raleigh, Dahon, Tern & Brompton.

  4. #4
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    Quote Originally Posted by HGR3inOK View Post
    petko8680 - There is some good technical information on Dahons and Terns available at Technical.

    -HANK RYAN-
    Norman, Oklahoma USA
    Hi,
    thanks. I went to that website, but couldn't find any info that might help me. also went to halfords today and explained them my problem, so the guy there told me it might be the length of the allen bolt that causes that issue. What do you think guys?

  5. #5
    Senior Member ThorUSA's Avatar
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    ok .. when u open the handlepost ... u see a big allen bolt silver shiny ..I think its a size 8 ...
    You loosen the outside allen bolt ... and than tighten the big shiny one to the point where you have no wobble or free play in the steerer colum.... than you tightne the outside smaller allen bolt ...
    voila
    done
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  6. #6
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    Quote Originally Posted by ThorUSA View Post
    ok .. when u open the handlepost ... u see a big allen bolt silver shiny ..I think its a size 8 ...
    You loosen the outside allen bolt ... and than tighten the big shiny one to the point where you have no wobble or free play in the steerer colum.... than you tightne the outside smaller allen bolt ...
    voila
    done
    By "a big shiny allen bolt", you mean the one that looks like a circle with a hexagonal hole in the middle(the circled one in the picture below. that's the only picture with similar item I managed to find, as bike is not with me now)?

    dahon_handle_post_ratchet_set_for_bikes_before_2009.jpg

  7. #7
    Senior Member ThorUSA's Avatar
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    yes
    see the plate on the left .. don't tighten the bolts there, the plate needs to move
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  8. #8
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    Quote Originally Posted by ThorUSA View Post
    yes
    see the plate on the left .. don't tighten the bolts there, the plate needs to move
    OK. Do you mean the plate in the upper right corner, with the two holes in it? The one that should basically lock the handlebar stem, right? I will not touch it at all- will only tighten the big circle shaped allen bolt and the small one on the outside.
    Last edited by petko8680; 03-18-14 at 03:20 AM.

  9. #9
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    Hi,
    I've done what i've been told and tightened the allen bolt inside the steering column. It actually locks the fork when tightened all the way down. But still got the issue with the loose stem. What else do you think it night be?

    P.s. what should be the length of the small allen bolt located at the bottom of the stem? Mine is 1" including the head of the bolt. Cheers

  10. #10
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    Are you sure that the play in the system is in the head set/stem attachment? have you put one hand on the front wheel and one on the handlebar and pushed in opposing directions while look at the stem? Photos and/or a video would be very helpful

  11. #11
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    Quote Originally Posted by thugpipe View Post
    Are you sure that the play in the system is in the head set/stem attachment? have you put one hand on the front wheel and one on the handlebar and pushed in opposing directions while look at the stem? Photos and/or a video would be very helpful
    Hi,
    can't post a video now, but let me try to explain it one more time, as I think I might have not done it properly in my first post. So, basically when all the handle bar and handle bar stem latches are locked, and I hold the front wheel tight between my legs and start turning the handbar to the left or right, it moves almost without any effort from bottom part all way up. Basically the whole stem turns left or right, but the wheel( and fork of course) isn't. So, if i try to ride, as soon as I try to steer, my bike keeps going straight, but my handle bar turns to desired direction. I am start thinking that it all comes from the allen key bolt at bottom of stem as it is just 2.5cm long and I think it needs to be about 3 or 3.5cm.
    Will be more than happy to hear your advice.

  12. #12
    Senior Member ThorUSA's Avatar
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    several right answers above to fix it.
    Now ...would be the time to look for adealer ...any bike dealer ..
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

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