Sprockets Chain wont stay on sprocket

Discussion in 'Transmission / Drivetrain' started by Andrew735, May 14, 2008.

  1. Andrew735

    Andrew735 Member

    My chain keeps coming off of the sprocket. I heard about grinding off some of the crome from the sprocket, but im not sure if thats the problem. Take a look and see if you can help me or send me to a page that can. thanks!
    CIMG0122.jpg

    CIMG0123.jpg
     

  2. spad4me

    spad4me Member

    Those are really nice close ups
    Place or wrap a wire pointer around the bikes frame. Next to the sprocket.
    Spin the tire.
    Does the sprocket wobble when compared to the pointer
    Tighten the high spots.
    Loosen the low spots a little bit.
    You need sprocket, rag washer, spokes, rag washer, and finally backing plate.
    This can take an hour. If you are not careful.

    Super glue the finished work.
     
  3. Simon_A

    Simon_A Member

    That sprocket looks way too underflush. The sprocket needs to come further away from the spokes.

    Edit: or the motor needs to be shifted a eighth to the right.
     
  4. The chain doesnt seem to fit it. Take the wheel off and wrap the chain around the sprocket to see if it fits in the grooves all the way around. It It looks like it fits correctly in the rear but on the front/ bottom it looks like the rollers are hitting top of teeth, might have been made wrong.
     
  5. Andrew735

    Andrew735 Member

    Thanks for all of the help! i will check things out and see.
     
  6. I did take a dremel tool with a bit and take some of the excess chrome off both my sprockets but neither one looked that bad...but maybe its just how I see the chain in the pic..
     
  7. Andrew735

    Andrew735 Member

    I did that and the sprocket did wobble. The sprocket wasnt mounted perfectly in the center of the hub so one side was higher than the other. I took the wheel off and loosened the bolts. now i just have to tighten them and make sure it stays flush in the middle. thanks for your help.
     
  8. HoughMade

    HoughMade Guest

    Wait, why is there a metal plate and rubber doughnut on the outside of the sprocket? One rubber goes on the inside of the spokes, one on the outside- both on the spoke side of the sprocket.

    Spad mentioned that, but it will cause problems if you do not do it this way. Here is a pic from Dax' website.
     

    Attached Files:

  9. Andrew735

    Andrew735 Member

    yea i have the rubber doughnuts in the right spot, but the sprocket wasnt centered on the wheel hub, so that caused it to wobble.
     
  10. Andrew735

    Andrew735 Member

    Hey everyone! i took the chain and wrapped it around the sprocket and this is what happened... im not sure what to do now. i think i might just have to take some of the crome off of the sprocket, but im not sure if that will make that much of a difference. take a look and tell me what you think. Thanks!
     

    Attached Files:


  11. I did take a dremel tool with a bit and take some of the excess chrome off both my sprockets but neither one looked that bad...but maybe its just how I see the chain in the pic..


    I would contact the vendor you purchased the kit from and see if he would send you another sprocket...
     
  12. Andrew735

    Andrew735 Member

    I think i will try that. Are most of the companies understanding about that kind of stuff?
     
  13. fetor56

    fetor56 Guest

    Your sprocket mounting system isn't setup correctly....the convex sprocket should be facing towards the outside,& those half-moon backing plates should be on the inside.The chain doesn't seem to be the correct chain cos it's riding-up on the sprocket...does it fit the countershaft sprocket ok?
    http://www.zbox.com.au/instructions.htm
     
    Last edited by a moderator: May 18, 2008
  14. Dude. What chain is that? Is that a BMX chain? The reason why I'm asking is that if you wrap a 10 speed chain around a front sprocket in a BMX bike it looks exactly like that.
    Did you buy that chain at a Wal Mart or someplace? Is there a chance you mistakenly bought a 10 speed chain?
     
  15. You do have the sprocket, doughnuts, backing plate mounted wrong. Are there any markings on the links for the chain? My stock chain, which I dont use anymore is marked ".081" on the links. I don't know what that means but you might check that and also check the front sprocket fit like Fetor suggested.
     
  16. spad4me

    spad4me Member

    You need sprocket, rag washer, spokes, rag washer, and finally backing plate.
    This can take an hour. If you are not careful.

    Your picture shows backing plate, sprocket etc this is not right.

    Make sure yot also have a bmx chain and not a multi speed chain for the engine driven side.
     
    Last edited: May 19, 2008
  17. Andrew735

    Andrew735 Member

    Hey everyone. thanks for the help. I moved the rubber doughnut to the inside so it sandwiches the spokes like its supposed to, but the half moon brackets are on the outside. Will that cause any problems or am i going to have to take it all apart again? The chain i have came with the kit i got from bicycle-engines.com, so it should be the right one. could i go buy one that would work from just a normal bike shop? or is the chain even the problem? Thanks again!
     
    Last edited: May 19, 2008
  18. You should follow the instructions from zbox.com that Fetor posted above. This is the proven way to make it work. Did you look on the chain to see if there were any markings?
     
  19. Andrew735

    Andrew735 Member

    I checked the chain for markings and i didnt see any. The chain fits the drive sprocket, so im not sure what the problem is. Im not sure if i can flip the sprocket around because that might bring the chain too close to the tire and it will rub. will it work this way or do i have to flip it and then find a way for it to clear the tire?
     
  20. fetor56

    fetor56 Guest

    About the only set rules in this is that the front & rear sprocket teeth are perfectly inline(or as close to perfect) as humanly possible & that the chain fits BOTH sprockets correctly....other than that u can do what u want.
    IF your having chain problems i suggest u either contact the vendor or get a better chain that is known to fit(KMC K910 Kool Chain)
    If u opt for the KMC chain you'll need 2 cos u just miss-out with links with 1.
    Contact the vendor anyway and see if there are any known problems with either the sprocket or chain cos i don't know for sure which one is the problem,i'm just assuming it's the chain.
     
    Last edited by a moderator: May 20, 2008
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