1. Dismiss Notice
  2. Hey Facebook people... We've created a group for XS650.com members to connect. Check it out!
    Dismiss Notice

Clutch worm gear

Discussion in 'The Garage' started by mofosheee, Sep 7, 2021.

  1. mofosheee

    mofosheee XS650 New Member

    Hello XS650 forum
    I have a NOS but "uncut" sprocket cover for my XR 750 undergoing restoration. The attachment shows that female threads for the worm gear were never cut. The exact replacement part is unobtainable and fat chance finding somebody who would cut the threads. I've looked

    Yamaha uses a similar system to actuate the XS650 clutch (attachment) as the XR750.
    The Yamaha part I found on EBay is very close in size, but a little too small.

    My intent is to mill the ears off theYamaha part, mill the HD sprocket cover to accept the Yamaha part and pin it in place.

    Is there anybody out there in forum world who has knowledge of a slightly larger clutch worm gear assembly?

    Yamaha clutch screw housing.jpg XR750 clutch release ramp2.jpg XR750 clutch release ramp2.jpg Yamaha clutch screw housing.jpg XR750 clutch release ramp2.jpg

    Thank you XS650 forum
     
    gggGary likes this.
  2. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

  3. MacMcMacmac

    MacMcMacmac Double Start Internal Left Handed Acme Thread.

    [​IMG]

    It might be easier to source a Suzuki unit that comes with the spiral gear inside a bearing cage with ball bearings in it. It seems easier to modify the case or the clutch mechanism with this design. It also has a steeper spiral, so you get more linear travel for the same amount of lever movement. They were used from the early 80's up until the last of the Katanas, and probably are still in use by some models.
     
    thuban and jetmechmarty like this.
  4. mofosheee

    mofosheee XS650 New Member

    thuban and jetmechmarty like this.
  5. DaveO

    DaveO XS650 Addict

    Last edited: Sep 15, 2021 at 8:28 AM
  6. mofosheee

    mofosheee XS650 New Member

  7. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    There was a fella here that modified a Royal Enfield clutch actuator for his XS. Said it worked very well. I picked one up a while back but haven't done anything with it yet. What I like about it is that it uses ball bearings instead of a worm. That means much less friction. If it can be modified for the XS, it should also be doable for your application. I'll see if I can find his notes.

    https://www.ebay.com/itm/224596945668?hash=item344b056b04:g:vX4AAOSwRLZUDYbH


    Untitled.png
     
  8. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Found it here. Not much hard info... but worth reading. Was done by @rusto


    IMG_0899.JPG

    IMG_0900.JPG

    IMG_0894.JPG

    IMG_0896.JPG
     
    Mikey, Adamc, Mailman and 1 other person like this.
  9. mofosheee

    mofosheee XS650 New Member

    Just freakin beautiful....... sometimes we just have to innovate. Great help! Thanks
     
    Mikey and Jim like this.

Share This Page