Brightspark Magnetos

NEW ... Take a look at some of the equipment we use in our workshop for magneto servicing and overhauls.

 

 

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Universal EasyCap for CAV 3U1 Magneto

  In the CAV 3U1 contact-breaker assembly, the fixed point is live and mounted on a block insulated from the back-plate. The moving point is earthed and mounted on the end of a spring blade. The points are opened by the U-shaped cam forcing a roller to wedge between the blade of the moving point and the fixed-point mounting-block.

The example shown is a clockwise magneto (as viewed at the drive-shaft end).

     

  A close-up.

No doubt identical contact-breaker assemblies are used in other models of CAV magneto.

 

     
  The contact breaker assembly disassembled. The Universal EasyCap will replace the insulating wafer second from the right.
     

 

The layout for the Universal EasyCap (on the underside).

Click on the picture for a pdf scale-drawing that you can print out.

 

     
  The EasyCap cut and drilled to size. There is no need to chamfer the holes because the screws that go through them have insulating sleeves.
     

  Ready to reassemble.
     
  Assembled and fitted.
     

The example shown is for a clockwise rotating magneto (as viewed at the drive-shaft end). For anti-clockwise magnetos, a mirror image of the example EasyCap will need to be made.

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