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New Front Sprocket Too Thin?

Discussion in 'Technical and Troubleshooting Torque' started by aus_dragon, Aug 13, 2007.

  1. Hey guys,
    Just a quick question. I bought a new front sproket for the bike the other day and when I took the old one off I noticed it was alot thicker.

    So I screwed the retaining nut back on and checked what the minimal distance was for the width of the sprocket. It measured to about 9mm.

    I measued the width of the old sprocket and it was about 9.5mm which is fine but the new sprocket measures to only about 7.2mm. Even with the washer this is not going to be enough before the nut bottoms out, meaning there wil be about 1.5mm-2mm free play for the sprocket to move around.

    Everything else about the sprocket is fine (ie: spline, teeth, diameter etc). I considered buying some thick washers to put either side but was not sure how safe that would be.

    Has anyone else experienced a similar problem or can anyone offer a solution. I have put the old sprocket on for the moment however it does still need to be changed.

  2. If it in link it "should" be ok.
    Personally, I'd be taking it back and replacing it with the same size that came off.
    A little movement on the spline will shop out the center of the sprocket or worse, the splines them selves.
  3. Sounds like you got a wrong size sprocket. Take it back.
  4. Yep, return it.
  5. take it back. it's the wrong one. either get it replaced for the correct one or a refund. your intilteled to it as its not the correct part.
  6. thanks guys I am going back to the shop either tomorrow or friday to get it changed or returned.
  7. It's the wrong pitch dragon...
  8. No the pitch is fine. When I noticed the difference in width I checked the rest of it (ie: pitch, spline, diameter etc) and it's all fine. It is just about 1.8-2mm to thin.

    You can trust I know what I am doing as I am a Mechanical Engineer by trade :grin: .

    As I said I will take it back to the shop and see what they say.
  9. Is it the shoulder of the sprocket that incorrect thickness or the width of the teeth?
  10. On a '91 FZR250 which would make it a 3LN3, if your swapping the front sprocket which i have a feeling you are... then it's the same 15 toother as off a Honda CT110 postie bike. I would know, i did the same mod on my FZR250!