Clutch problem by Rickard Nebrer

      A common problem on BSA B50 is the clutch.
      The old 4 plate clutch from 1959 was changed in 1971 to a 5 plate clutch ie 5 Clutch driven plate & 4 Clutch (friction) driving plate .
      This was changed 1972 to 5 Clutch driven plate & 5 Clutch driving (friction) plate.
      But this is still too weak for the B50.

      I have seen lots of different solutions to the problem, and many of them are eating clutch cables.

      Some solutions are:

      Triumph Cub clutch springs
      Washer under spring cup.
      Alloy Pressure plate.
      Speedway clutch.
      Kevlar plates.
      1 extra steel plate behind the pressure plate.
      1 extra friction plate behind all ordinary plates.


      I'm using a washer under spring cup and 1 extra friction plate behind all ordinary plates.
      Once a year I sandblaster my steelplates, with good result.
      This is a 2 hand clutch. The M.O.T loves it. I use to say that the bike is my Wife's and
      People use to ask why I'm only bodybuilding my left arm.

      To think about!!

      Remember that new frictionplates are thinner than the old original ones.
      Don't use Racing oil on the cluch!!
      OTJ have a Heavy-Duty friction plate!!!!.




      Some photos on modyfied Clutch arms.


      © Rickard Nebrér