Brightspark Magnetos

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.