Chain jam almost lead to a GREAT FALL!! help!

Discussion in 'General Questions' started by StrontiumEthics, May 11, 2010.

  1. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    Today i was riding, and I got into what my motorcycle friend called "Ninja Mode" when you get so airheaded and thing you can do anything. While traveling down a fairly wide street, the engine chain seized up locking my wheel! Thank God a car was far away from me or else I would have been roadkill. What is a way I can insure both the tension of the chain, and the alignment of the sprocket? I have one bike with a shift kit, and frankly I like it an all but I love the simplicity and power of just a single drive. But It seems a little unsafe. Is there some kind of bracket to safely mount the sprocket? By the way my bike tires were 27" by 1/4 so skidding on those aren't that safe. Not to mention the rims are Totally messed up now.
     

  2. I use the chain tensioner as a tensioner and guide. I also use a bracket to hold my tensioner to the frame so it won't move.
     
  3. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    Do you mind posting some pictures? I have pretty thin rear stays so the tensioner doesnt clamp it tight enought when I tighten it. That is one of the reasons why the chain jamed because it was very slack and got caught in the engine.
     
  4. KCvale

    KCvale Motorized Bicycle Vendor

    Just do like I do. Adjust the motor chain so it's perfect to wheel with no tensioner, then mess with the pedal chain, if you are lucky just a 1/2 link will set you up and you won't need any tensioner like this.

    [​IMG]

    If you can't get a match with just a little slack in the pedal chain so you can just move the wheel back to tighten the motor chain, put the tensioner on the seldom used pedal side.
    Either way, the always moving drive chain is like a motorcycles, it won't screw up and wreck you.
     
    Last edited: May 13, 2010
  5. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    Ahh. I really wish I can do that but I don't have a horizontal drop frame where i can adjust the wheel! Its not like the one in the picture that allows adjusting. Any other alternatives?
     
  6. In the pic of my bike you can see i added a extra kickstand(does not actually work as a kickstand). The kickstand had a hole for mounting,i mounted the kickstand using a bolt from the tensioner and then clamped the kickstand to the frame,now my tensioner/guide does not move or go into wheel.

    You could also use a metal bracket,clamps or screw.
     

    Attached Files:

  7. KCvale

    KCvale Motorized Bicycle Vendor

    Post a pic of the the back wheel of your bike.
     
  8. I reworked the stock tensioner

    This works well for me so far. One draw back I have found is if the this tensioner has more then 3/4 in down play the bike tend to lock on start up.
     

    Attached Files:

  9. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    To my realization I check my tensioner mount today and I seen that It was Bent downward. So now I gotta make a new tensioner of some sort! Any ideas? Pictures or post. Keep in mind that I have to fit fairly small stays. I was thinking of using a steel or aluminum strap from a junkyard and using a U clamp but where can I get such a small u clamp from?
     
  10. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    where did you get the chrome part of the mount from?
     
  11. 210061741

    210061741 Guest

    Use shim plates or nuts between the engine and the rear mount block.

    All you need to do is jack the engine forward to get the right tension.

    Then you don't need the tensioner.

    Them tensioners are dangerous and don't work.
     
  12. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    Hmm. Dangerous is definately the right word! lol. Perhaps I should try that idea of yours. lol. Can you elaborate on it a little.
     
  13. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    This is pretty much how my bicycle is. Notice the rear stays. If I get a tight chain tension wouldn't it like pull the bike wheel off? I was also thinking I would probably need some sort of guide.
     

    Attached Files:

  14. It is a stock tensioner. The swingarm is the trough the frame mount that comes with kit.
    Nuts were welded to the bracket facing out so the swingarm bolt can be locked with a nut. I welded the spring nut as well so it can be replaced if needed.
     
  15. 210061741

    210061741 Guest

  16. KCvale

    KCvale Motorized Bicycle Vendor

    I had to put a tensioner on my bike today.
    I bumped the rear pedal sprocket up from 18 to 19 teeth for a little better coaster braking and I just couldn't get the chains to match.

    [​IMG]

    Note the drive chain still doesn't need one.

    All you need to do for the small chainstay area like this is use some inner tube are shims. Works great, and again, it is not on the drive chain.

    That tensioner was $20 on-line.
    Sleek and small, and as you can see it does the light work of the pedal side great.
     
  17. 210061741

    210061741 Guest

    Cool setup.

    Ya keep the tensioner on the peddle side.

    I'd just pop a few links out of the chain.

    The rear derailer can compensate for 1 link easily.
     
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