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B50 sleeve in a B44 ?

Discussion in 'BSA' started by gjr, Feb 5, 2019.

  1. gjr


    Mar 5, 2010
    The cylinder on my brother's B44 is worn almost 0.08" over, it is a little oval, and has a small crack at the corner of the rod cutout in the existing sleeve. What to do ? Since he's never going to ride it (can't start it) I'd put it back together. Harry on the other hand is wondering about putting a B50 sleeve and piston in this motor. Is it possible ? Will the cases need to be bored to fit ? Does this modification ever have a happy ending ?


  2. Fast Eddie

    Fast Eddie VIP MEMBER

    Oct 4, 2013
    Well that will hardly make it easier for him to start it !
  3. kommando


    May 7, 2005
    At 84mm the sleeve is too large, you need to relieve the outside of the sleeve at 4 points for the barrel studs and you create 4 weak points that allow blowby.

    Speak to EdV and either get the barrel with the liner repaired if the crack can be milled out and rebored but with a slipper piston that could be an issue. Or replaced with an alloy liner nikisiled max bore 82mm (and the B44 std liner is cast into the barrel so has to be machined out, you cannot push it out).

    Last edited: Feb 6, 2019

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