chain keeps popping off sprocket

Discussion in 'Frame Mounted Engines' started by madaneerg, Aug 20, 2010.

  1. madaneerg

    madaneerg New Member

    always heard a bit of a "click" once in awhile, but yesterday the whole chain seemed to climb off the rear sprocket under speed and popped off.

    I can't seem to get it back into alignment now. & not sure what's wrong as I adjust the tensioner (cheap nasty one) that came with the kit and looks dead on. Then I wheel the bike and it climbs up again.

    Strangest thing is when I roll it in reverse, no problems.

    Any ideas? Sure it's right under my nose :)

  2. Alaskavan

    Alaskavan Guest

    It just about "Has to be" alignment. The only other possibility (that I can think of) would be that your chain has stretched on one side (possible half broken link?). I'd put a straight edge on the rear sprocket and see if it lines up with the front one.
  3. madaneerg

    madaneerg New Member

    ok, like the straight edge idea - didn't think of that. better than guessing
  4. Al.Fisherman

    Al.Fisherman Active Member

    String would most likely be easier to thread through frame. Pull on both ends for a straight line.
  5. madaneerg

    madaneerg New Member

    thanks Al.Fisherman - and thanks for being so helpful in other threads.
  6. Lazieboy

    Lazieboy Member


    Is your tensioner pushing up on bottom of chain. maby this is a stupid responce but i screwed this up at first build.
  7. Lazieboy

    Lazieboy Member

    Al, I also did that but only on the motor's sprocket.
  8. Al.Fisherman

    Al.Fisherman Active Member

    I do both on all builds weather they look like they need it or not. Had a issue on my first build and the rear sprocket was more of a PITA on then off.
  9. gearhead222

    gearhead222 Member

    FWIW, the stock chains are, in a word, ca-ca. I had mine for about 200 miles and she stretched and stretched and STRETCHED! A heavier duty chain is highly recommended. My .02-Gearhead