Chain Binding

Discussion in 'Motorized Bicycle General Discussion' started by T-White, Apr 14, 2008.

  1. T-White

    T-White New Member

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    I just got a Chinese 2stroke engine kit. fitting the kit was a breeze but mounting the chain has been a real nightmare. my chain is not sitting on the teeth very well and the teeth just push the chain to derail. I am thinking of grinding the teeth. does any one know of a solution. any suggestions thanks
     
  2. SeattleMike

    SeattleMike New Member

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    Pretty much everyone has to file/dremel the teeth of the rear sprocket so that they are more pointy. I think it is almost guaranteed that without doing this, the chain will pop off.

    When I first got my bike going the chain popped off every minute, and the chain bunched up in the front sprocket area, and it was a real pain. Once I filed the sprocket teeth, no more problems with this.
     
    #2 SeattleMike, Apr 14, 2008
    Last edited: Apr 14, 2008
  3. T-White

    T-White New Member

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    it seems to sit fine on the rear but the front is where the problems are. It seams tight to get the file in to the front sprocket is it possible to remove the front sprocket and go from there with a file?
     
  4. SeattleMike

    SeattleMike New Member

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    Hmm, if the chain is being pushed off the teeth of the front sprocket it could be that your chain is not tight enough. These chains need to be pretty darn tight, I read somewhere that the chain should only move up and down 1/4 inch.
    I'm not sure how to get the front sprocket off, I'm sure there are lots of people on this forum that can help you; its full of helpful people that know the bike kits inside and out.
     
  5. T-White

    T-White New Member

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    I think a combination of teeth reshaping and chain tension will be the way to go for my problem. I have a RK 415h chain that I will take the master link out and cut to the correct length. This chain is allot nicer than the stock chain.
     
  6. deacon

    deacon minor bike philosopher

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    Adjust your chain length first, but yes some people do have to file the front sprocket. I didn't so i don't now how to do it but there will be others who answer and do know how.

    Try this thread it looks to be your problem.... http://motorbicycling.com/f3/drive-sprocket-518.html
     
    #6 deacon, Apr 14, 2008
    Last edited: Apr 14, 2008
  7. SeattleMike

    SeattleMike New Member

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    Does the chain really fit well? My chain stretches so much I've been wondering if there was another chain out there the same size that wouldn't stretch.
     
  8. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    3/4" not 1/4".

    These chains should be run fairly LOOSE or you will encounter all kinds of bearing and tensioner problems.
     
  9. SeattleMike

    SeattleMike New Member

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    maybe this has been my problem! dang
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Some have to file the front sprocket, depending on who you bought your kit from.

    The chain will stretch for quite a long time, but once it's done, it will not need to be adjusted frequently. 300 miles or so should do it, until then you will have to adjust the chain very often.
     
  11. ran49

    ran49 New Member

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    T-White
    I also had a problem with my chain fitting the drive sprocket.So bad I thought I had the wrong size sprocket.The helpful folks on this forum were kind enough to inform me that the unidentifiable part I had left over(short piece of threaded pipe with a nut on it) was actually a gear/sprocket puller.If you have one,Its alot easier to work on your sprocket if you pull it out.To remove sprocket nut I jammed the sprocket with a small piece of wood between teeth and motor housing to keep engine from turning.Dremmel tool does work good.Ron
     

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