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

 

Slip-ring

If you can see the slip-ring through the pick-up hole in the main housing, check that the brass ring or segment of the slip-ring is brass coloured (albeit possibly a bit dirty or tarnished), but not completely black. With twin- or multi-cylinder magnetos, and some single-cylinder magnetos, the brass is a segment, rather than a complete ring, and you may need to rotate the armature in order to be able to see it. If the brass is black, it indicates that the brush(es) are too soft and/or years of neglect.

 

IMPORTANT. If you haven't already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. This disables the magneto to reduce the risk of electric shock and fire.

 

Wrap some rag around the end of a stick about 1/4" diameter, moisten it with petrol or other cleaning fluid (but not so much that it is dripping), poke it through the pick-up hole in the magneto body, and rotate the armature to clean the slip ring. Repeat with clean pieces of petrol-moistened rag, until the rag comes out clean.

 

Now let the slip ring dry out with the pick-ups still removed.

 

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