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XS2 master cylinder size

Discussion in 'The Garage' started by eight0, Aug 17, 2017.

  1. eight0

    eight0 XS650 Enthusiast

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    Can someone help me identifying the front master cylinder I have on my XS2?

    underneath it has 2 5/8 2. The Outside diameter of the bowl is 50mm and the inner diameter is 45mm.
    I ordered a replacement cap and diaphragm that was supposed to be for my bike from Yambits but it was too small so I was wondering if mine had been changed at some point.
     

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    Last edited: Aug 17, 2017
  2. eight0

    eight0 XS650 Enthusiast

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    London
    Doing some digging it looks like it is the original and that Yambits just sent me the wrong size part and I do have the original one.
    The master cylinder doesn't seem in too bad shape but the circlip has broken, does anyone know what size I need to replace it
     
  3. I bought a complete rebuild kit from Yambits for my 72 .price was about £38 .comes with everything you need.
     
  4. eight0

    eight0 XS650 Enthusiast

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    Thanks Yellowdog, I was hoping to save the money but I think the rubber 'hat' was missing as well so I bought the Yambits rebuild kit.
    The internals are different than the ones in this post http://www.xs650.com/threads/master-cylinder-rebuilding.7862/#post-267951
    Where does the brass coloured metal disc go that comes with the kit go? Also I don't seem to have that white plastic cross part as in gggGary's post.
    Are the 73 internals that different from the 72?
     
  5. Hi ,that solid brass disc is not used but I think you need the white plastic bit,the rubber top hat was nearly impossible to fit and I can't remember off hand if it's on the bike or not ,it's only a dust seal.
     
  6. image.png Picture of old and new m/c kits ,I did mine about 4 yrs ago now and can't quite remember how it went ,sorry.
     
  7. eight0

    eight0 XS650 Enthusiast

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    Thanks for the picture. No problem, I will keep searching!
     
  8. eight0

    eight0 XS650 Enthusiast

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    18
    London
    Just in case someone comes across this thread in the future and finds this helpful...
    You do need the white plastic piece (Top no 2 in the picture above) but it no longer attaches to the piston with a circlip.
    The spring fits into the white plastic piece as before, that sits inside the new style rubber without the hole in it (bottom no 1) the brass disc goes on top of that. The piston then sits on top of the brass disc.
    Use some brake fluid to lubricate it before you put it all in there. After you've got the top circlip in, you can use the circlip pliers to help get the 'top hat' on.
     

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