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XJ550 Master Brake Cylinder - Does XS650 fit?

Discussion in 'XJ Technical Chat' started by juntao, Jun 30, 2025.

  1. juntao

    juntao New Member

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    Hi all.

    I have a XJ550 4V8 -82 (so the European model).

    Its rebuild with what I think is a CB650 Brake Cylinder which is broken beyond repair.

    I now want a Yamaha one (might as well) and where I live (Sweden) its hard to find parts that don't have a real long delivery time (with customs and all) so:

    I have found a XS650 Master Brakecylinder for 77-84 model.

    This one has a fitting for 22mm handlebar and M10x1.25 mm banjobolt fitting. It has a 16mm bore (so 5/8" which also seems correct).

    I will also order two copperwashers for the banjobolt.

    So my question is, if anyone know that the XS650 MBC does fit on a XJ550?

    It would save me both time and energy to get it for a reseller here in Sweden. I asked them but they were not sure if it would fit, so before I order I would just like to check here.

    Thanks!
     
    Last edited: Jun 30, 2025
    juntao, Jun 30, 2025
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  2. juntao

    juntao New Member

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    Screenshot_20250630_190641_Chrome.jpg
     
    juntao, Jun 30, 2025
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  3. a100man

    a100man Well-Known Member

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    I recenty fitted this one to my 4V8..
    ..https://www.mandp.co.uk/products/master-cylinder-rectangle-5-8-5-87mm-331950
    /.. looks similar to the one you have lined up . I previously had one from a GPZ 550 I think .
    I swappped it after I refurbed the calipers with new seals and pistons bit it diodn't make much difference
    the brakes are still a bit crap. I have braided hose but they're quite old so perhaps thats now the problem.
     
    a100man, Jul 1, 2025
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