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Thread: Atc125m front sprocket sliding side to side

  1. #1
    DDQ's Avatar
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    Atc125m front sprocket sliding side to side

    I just tried to take this motir for a test run and as soon as I put it in gear and started going a lit of oil started leaking from around the front sprocket. I also noticed that shaft will slide side to side like in this video I took.
    Is this movement normal? Also, I cant find that seal online anywhere. What is the specific name for it? Thanks!


    https://youtu.be/8HDtyOuprpA

  2. #2
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    I'd guess that's not normal. Maybe a spacer or circlip missing inside?

  3. #3
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    I think I found the seal, sort of. I looked on Partzilla. I looked at the "left cover spacer + sub transmission cover" diagram. I believ it's number 16. Partzilla says that it's "part obsolete". They list the size as 31x43x7. I would guess that means 31mm inner diameter, 43mm outer diameter, 7mm thick. You could probably take those dimensions and find an aftermarket seal somewhere. Hope this helps.

  4. #4
    DDQ's Avatar
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    Thank you. I am going to pull the sub trans today and see what else I need. I hope I am just missing a c-clip somewhere on that shaft.

  5. #5
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  6. #6
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    I am missing a c-clip.




  7. #7
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    The parts missing are 8 and 9. I ordered them along with the oil seal. I hope this will get me going. Can anyone tell me if this seal must be removed through the back of the case where the sprocket is? That would mean I will have to pull the cover off the output shaft.


  8. #8
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    According to the diagram, it looks like you need to pull the cover off to get the seal out, but DON'T take that as gospel.

  9. #9
    DDQ's Avatar
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    I just pulled the cover off and am waiting on parts now.

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