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  1. #1
    CB750 Member Ajsharp991's Avatar
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    MC bore size question.

    1980 750K.
    While I wait for my plug wires, i am getting into my front end braking. I have already painted and rebuilt my caliper. Has anyone tried a 1/2"/12.7mm bore size on their bike? I know stock is 14mm. I also know a smaller bore will allow more lever travel and cause a softer feel on braking, but I would appreciate some input from some one who has done it before so I can learn a little. Is 1/2" too small, or will I hardly notice a difference? Reason I'm asking Is because I have a setup already and would like to use that. Thanks!

  2. #2
    CB750 Guru amc49's Avatar
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    Sounds like to me you will be the test guinea pig there..............

  3. #3
    CB750 Member Ajsharp991's Avatar
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    Damn, oh well. I figured someone had maybe tried it already. Plan on using stainless line. I hear that helps stiffen up the lever slightly. Will post updates after I install then.

  4. #4
    CB750 Guru amc49's Avatar
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    People generally go up in ID instead of down, the reason is the bigger ones are for dual discs and people tend to confuse them. A smaller ID master is generally one off a smaller lighter bike with smaller disc. 9/16" is the standard single disc one and 5/8" for double discs.

  5. #5
    CB750 Member Ajsharp991's Avatar
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    Just waiting on a custom line from Core so we will see soon.

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