Broke a keyway

Discussion in '4-Stroke Engines' started by chuck216, May 19, 2008.

  1. chuck216

    chuck216 Member

    For a while now I've had a problem with the chain coming off. Well this time it did it and caused the chain to wrap around itself on the front (engine) sprocket. The result.. a sheared keyway on one of the gears inside the gearbox. I have the huangsheng 4 stroke with one of the "figure 8" type gear boxes. does anyone know where I can get a replacement keyway?

    Also any suggestions of what may be causing my chain to come off in the first place, I've tried it tight, loose and all points in between.

  2. HoughMade

    HoughMade Guest

    Key, or keyway?

    A key can be found at any well stocked hardware store- Ace is a favorite of mine.
  3. chuck216

    chuck216 Member

    sorry .. the key itself that goes into the slots.
  4. Proboscis

    Proboscis Guest

    Up north here you can find woodruff keys at Canadian Tire.
  5. greguk

    greguk Member

  6. Marktur

    Marktur Member

    I would check the alignment of the gears. If you hear any type of clicks or funny sounds from the chain while rolling with the clutch disengaged, 99% of the time it's from an alignment problem. A wobbly gear at higher speeds will eventually throw the chain.

    Hope that helps :)
  7. chuck216

    chuck216 Member

    Yep, the alignment was slightly off, well not the chain itself but the idler wheel. I added a spacer and that fixed everything.
  8. Marktur

    Marktur Member

    Great - now go have some fun! :)