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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

 

Internal HT Continuity

With a multimeter, check the resistance between the brass of the slip ring and the end of the armature shaft ('armature earth').

 

Make a note of the reading; you'll need to refer to it later.

 

Values vary considerably depending on the make and model of magneto and who wound it. However, if the reading is more than 7000 ohms, there is probably either a break in the HT winding, or a bad connection between the live end of the HT winding and the slip-ring. If the reading is less than 3000 ohms, it would be unusual, but is indicative of a problem. In either case, the magneto needs a more complete overhaul.

 

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