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Master cylinder

Discussion in 'XJ Modifications' started by Scorpion1016, Jun 2, 2017.

  1. Scorpion1016

    Scorpion1016 Member

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    Hey everyone not a serious mod but more curious than anything. I have an 81 xj750r seca. I was wondering if any one has mounted a 750 maxim handle bar master cylinder and if it works. What needs to be done. As well as if the dual brakes would work. Also does an 81 seca and an 82 seca have different master cylinders?
     
    Last edited: Jun 2, 2017
    Scorpion1016, Jun 2, 2017
    #1
  2. Toomanybikes

    Toomanybikes Well-Known Member

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    As long as internal piston size is the same it will work.
    The size is cast into the case it will say 9/16, 5/8 or 15 or 14 etc. This size is critical to making brakes and anti dive and 1 or 2 calliper system work. General rule single or double calliper and tilted or flat master cylinder
    First pic 83 xj750 Maxim( tilted)
    Second is 85 Xj700n ( flat )
    Both have 5/8 bore piston
    Both My Xj750rl and my xj650rjc have the flat 5/8 master cylinder .
     

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    Last edited: Jun 2, 2017
    Toomanybikes, Jun 2, 2017
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    XJ550H, Jun 2, 2017
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  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Just for clarity's sake, do not fit the master cylinder from a 750 Maxim unless you plan on fitting bars with a sufficient angle to keep the master cylinder running flat. Running it tilted will cause brake line pressure to drop, exactly when you don't want it to.
     
    k-moe, Jun 2, 2017
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  5. Scorpion1016

    Scorpion1016 Member

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    Thanks everyone just weighing some options for the brakes best to just rebuild them.
     
    Scorpion1016, Jun 2, 2017
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