Clutch I lost my lock screw.

Discussion in 'Transmission / Drivetrain' started by Zaqq, Apr 13, 2014.

  1. Zaqq

    Zaqq New Member

    Well, this is a rather simple question. Do you guys know where I can get a new lock screw for the flower nut in the clutch? I seemed to have misplaced mine during a disassembly. I lost it last year before the winter and it started slipping after a mile or so. I have looked on many of the online vendors and I cannot find any replacements. I was wondering if you guys could point me in the right direction for finding a replacement online or the thread count/size.

    Thanks.
     

  2. 074KU

    074KU Member

    It is a 3mm screw with a 0.7 thread pitch.
     
    Zaqq and Fabian like this.
  3. Fabian

    Fabian Well-Known Member

    I never knew it had a 0.7mm pitch thread.

    You learn something new every day, especially on this forum!
     
  4. Zaqq

    Zaqq New Member

    Thanks a lot, this will definitely help out!
     
  5. 074KU

    074KU Member

    Glad I could be of some help.
     
  6. Zaqq

    Zaqq New Member

    I finally had a chance to fix this thing and I found that it is really 4mm with .7 thread pitch. It may just be my specific Chinese engine or you may have typed it up wrong.
    Cheers.
     
  7. 074KU

    074KU Member

    heh, could be a change, I gave it a second measure with my verniers and it is indeed a 3mm on my bike. The engine is many many years old though so that may be something else they changed over the years.
     
  8. Fabian

    Fabian Well-Known Member

    Although i haven't measured my flower nut indexing screw, from memory it appeared to be around 3mm, though my engines are around 4 - 5 years old.
     
  9. 074KU

    074KU Member

    Your engine is of similar age to mine, if there isn't already perhaps some ambitious person could log these changes and give each type an unofficial model number as I have had a lot of trouble trying to get an "official" engine designation for any of my kits.
     
  10. crassius

    crassius Well-Known Member

    flower nut lock screw is usually same as clutch cable lock screw
     
  11. DudeMar

    DudeMar New Member

    For those who may need to make a replacement flower nut indexing screw. A common PC screw with a little metal filing fits perfect. This type of screw has the anti back-out inner ring on the underside of head and is the proper thread count and about 5mm thread length when in original condition. Will add a pic if any are interested.
     
  12. butre

    butre Well-Known Member

    it's worth noting that there are at least 3 different screw types in any given computer on account of the fact that a modern pc is an amalgamation of about a dozen different styles. I believe the screw you're referring to is the same one that holds the main board in place.
     
  13. DudeMar

    DudeMar New Member

    Indeed Sir. You called it, so I had a pic at the ready. incoming Pic:
     

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