NEWS FLASH - December 2013
We are now selling magneto bearings, insulators, oil seals and armature shims from our on-line shop.

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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DIY Magneto Maintenance and Troubleshooting

Bearings and Bearing Insulators
Pick-up, HT Lead and Plug-cap - 1
Slip-ring
Contact-breaker Assembly
Cam
Internal HT Continuity
Main-body Earth Brushes and Bearing Insulators
Contact-breaker Re-installation and Points Setting
Low-tension Continuity
Earth Brush Continuity
Complete High-tension Continuity
Will It Spark?
Timing
Pick-up, HT Lead and Plug-cap - 2

 

Cam

Check the cam surface. If it has any unusual marks, try to work out what caused them and whether anything should/could be done about them.

 

Manual advance/retard versions:

 
  • Remove the cam, carefully noting which way round it goes and which notches in it engage where.

 
  • If there is a lubricating felt, soak it in oil.

 
  • If there is a groove where a lubricating felt should be, but is missing, consider making and fitting a replacement.

 
  • Disassemble the advance/retard mechanism carefully noting which part goes where. Check for wear and replace any worn parts. Grease. Reassemble and check operation.

 
  • Put a smear of grease on the surface of the cam that engages its housing.

 
  • Replace the cam, ensuring that the notches in it engage as before (e.g. with a fixed register in the cam housing and with the advance/retard actuator).

 
  • Check that the advance/retard mechanism reliably rotates the cam back and forth.

 

Put a smear of grease on the lobe(s) of the cam.

 

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