chain froze up

Discussion in 'Transmission / Drivetrain' started by daveet66, May 13, 2015.

  1. daveet66

    daveet66 Member

    last week my chain froze engine quit it was jammed in front anyone know what causes this and how to prevent it?

  2. crassius

    crassius Well-Known Member

    can be that chain is too loose, but sometimes a heavy duty chain will rise up on a cheap drive sprocket that has flat topped teeth and won't let the chain fall down into the valleys - this can be fixed by filing or grinding the teeth to be more narrow in the direction of turning
    daveet66 likes this.
  3. Aaron Atkinson

    Aaron Atkinson New Member

    Chain jams

    Hi all I'm new here and I recently bought a motor from bike berry on Amazon and the chain jams and I can't figure out what to do now because it jams then now the clutch won't work plz help!!!!
  4. crassius

    crassius Well-Known Member

    you first need to get it unstuck, then fix whatever is making it get stuck
  5. The_Aleman

    The_Aleman Active Member

    Some castings are pretty tight around the engine sprocket which makes the chain get stuck. You need to increase the clearance or run a smaller chain.

    Kit chain is usually 415H, running a standard 415 might take care of the problem. Otherwise you'll have to get in there with files or a dremel.
  6. Aaron Atkinson

    Aaron Atkinson New Member

    Thanks for the help I'll try that
  7. KCvale

    KCvale Motorized Bicycle Vendor

    Pull your left drive sprocket cover off and look inside it, in the front of the cover where it is flat.
    Chances are you see chain scraping marks.
    Either grind that area down, or just cut a chunk of the cover out to let the chain ride free.
    This hurts nothing and you can't even see it as the magneto cover is right next to it.
    daveet66 likes this.