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750 Seca brake master cylinder conversion

Discussion in 'XJ Modifications' started by blue303, Aug 30, 2023.

  1. blue303

    blue303 New Member

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    I have an 80 XJ650 Maxim that I put on the forks and front brakes from an 82 XJ750 Seca. I did not use the master cylinder from the Seca. My bike had a mc from an 82 Honda Magna because a previous owner swapped out the original bars for a more traditional set of straight bars. This mc has a bore of 5/8 while the Seca mc has a bore of 11/16. Is this going to cause any problems or is there another suggested master cylinder that I should get to make sure the brakes work properly? I have seen several threads talking about changing to a bar mounted mc on a Seca but they never really mention what mc that they used.

    Thanks for any help on this.
     
    blue303, Aug 30, 2023
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  2. Timbox

    Timbox Well-Known Member

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    That is a very small change I would guess not much difference.
    5/8 = 0.625
    11/16 = 0.688

    I could be wrong, but as long as you get the feel for the bike with that MC and the swapped out front end, you should be good to go.
     
    Timbox, Aug 30, 2023
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