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

 

Low-tension Continuity

Rotate the armature until the contact-breaker points are open.

 

Measure the resistance with the two probes of your multi-meter shorted together. The reading will probably be a fraction of an ohm.

 

Then measure the resistance between the two points of the contact-breaker.

 

The reading should be between 0.5 and 0.7 ohms greater than your first reading.

 

  • If it is significantly higher, there is a bad connection or break in the low-tension circuit, in which case the magneto will need a more complete overhaul.

  • If it is significantly lower, then there is probably a short-circuit in the contact-breaker assembly or in the armature. So, re-check everything in the contact-breaker assembly first before deciding on a more complete overhaul.

 

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Home EasyCap™ condensers Magneto parts Magneto services Magnetos for sale Online shop Conden­sectomy Magneto maint­enance Library Down­loads FAQs Gallery Work­shop Inform­ations en français Testi­monials News Links Contact

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