Chain keeps breaking

Discussion in 'Frame Mounted Engines' started by intheclear, Oct 1, 2011.

  1. intheclear

    intheclear New Member

    My chain keeps breaking. My theory is that it comes off the rear sprocket because there is a lot of sideways pull on the chain by the idler in order to get around a thick wheel.
    My first idea for a solution is to space the rear sprocket farther away from the spokes in order to remove the sideways pull on the chain.
    Any ideas of what I could use for spacers / Any other suggestions as to how I could fix this problem?

    -Greg
     

  2. bideronit13

    bideronit13 Member

    Check out google search for 7 speed dearailer adjustment and youl find a video tutorial. Thats what I did. I didnt know about it before know I got it down.
     
  3. professor

    professor Active Member

    Seems to me the solution is a smaller cross section tire and better chain alignment.
    I suppose you could tweak the spoke setting to move the wheel over away from the chain.
     
  4. bideronit13

    bideronit13 Member

    The other day I was just doing a final test on my SBP 4 stroke shift kit and I was going to fast as I needed to adjust the breaks. So anyway I could'nt down-shift in time to stop at a red light.
    So I made a mistake while I was stopped to try and down-shift all the way. My chain broke when I took off.
    My stuff is all brand new.
    What condition is your stuff in? Another rim would allow you to conduct a test were you could compaire the possable wear on the internal parts of the rim.
    Another way to see the play in the internal parts of the rim is to just use the front freewheel in reverse spinning the chain backwards while watching the rear sproket turn looking for the amount of movement.
    Even mine being new has some play and there is minimal movement from side to side.
     
  5. intheclear

    intheclear New Member

    I wanted to try spacing out the sprocket before buying a whole new tire, because I should be able to get it to run with a standard 26 inch tire. but if worst comes to worst...

    Its all brand new. I'm not using a shift kit though, its just a standard clutch. Is the shift-kit a "frame-mounted drive-train"?
     
  6. bideronit13

    bideronit13 Member

    The shift kit flips the drive train to the other side to the actual bikes chain.
    Mayby your chain is snagging. Try to run tests so you can watch it and not ridding it.
    Is it the master link thats comming apart or just random links?
     
  7. bideronit13

    bideronit13 Member

    I hate to do this to you but I weight like 240 and I bend axle's.

    Take the rim off and check and see if your axle's bent.
     
    Last edited: Oct 2, 2011
  8. intheclear

    intheclear New Member

    I checked the axle and its fine. Its not the master link, its random links... and it always breaks next to the sprocket. There are indentations on the sprocket screws from the chain rubbing against them which means that it breaks AFTER it comes off the sprocket. This suggests that it is somehow being pulled off the sprocket.
     
  9. bideronit13

    bideronit13 Member

    From what I think your getting aqt its the front sproket chain guard screws? Are all the teeth on the sprockets streight.
    If those are the screws your talking about I'd try to remove the chaingaurd.
     
    Last edited: Oct 2, 2011
  10. bideronit13

    bideronit13 Member

    Maybe when its coming of the sprocket its snagging on the chain gaurd screw and gettng stuck and snap.
     
  11. bideronit13

    bideronit13 Member

    One more thing to worry about is after a few breaks the chain get kinked and Im not talking about a girl either. Just kidding
    You might want to check for kinks also things just pile up sometimes.
     
  12. bideronit13

    bideronit13 Member

    Id have to say Im pretty sure you found it. The wear on those screws pretty much is it. You might need a new chain you did great hanging in there and if it goes any further I be around .
     
  13. intheclear

    intheclear New Member

    Well, that seems to have been it... I spaced out the sprocket with blank CDs, so that there was no sideways pull on the chain. It seems like it works now but now I'm having problems with the clutch slipping so I can only start the thing... 20% of the time.
     
  14. bideronit13

    bideronit13 Member

    Minimize your setup & problem to a few words and run it through google then look for the link to this site.
     
  15. bideronit13

    bideronit13 Member

    If your running a 2 stroke 66CC make sure your running the hot plug NGK B5HS.
    I'll see ya Later
     
  16. AirEdRacing

    AirEdRacing New Member

    Buy American made roller chain. The Chinese stuff is ****.
     
  17. richirich1113

    richirich1113 Member

  18. Holly

    Holly Member

    Can you explain better how you used the CDs?
     
  19. CrazyDan

    CrazyDan Member

    Intheclear hasn't been on the forums almost 5 years, doubt he'll reply.
     
  20. Holly

    Holly Member

    It was worth a shot. I fixed my chain issue last night anyway. Thanks!
     
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