Exactly. I replaced the points and condensers in this motor with Atom modules and replaced the plug wires while I was at it. The spark was checked before the terminals went on.
The secondary windings in the coil can be checked by undoing the plug wires and connecting an ohm meter to either the two upper or lower plug terminals or if the flywheel is off, connecting to the terminals on the coil. Readings seem to vary but around 8-9 K ohms seems average. The value for your condenser should be 0.10 uF. ’47 and later Zephyrs with slightly different coils have condenser values of 0.20 uF. It seems these magnetos are more sensitive to having the points clean and polished than other mags. Setting the point gap at exactly 0.020" also helps to get a good spark at the plugs which are set at 0.025". If the spark is weak or nonexistent, I’d suspect dirty points or a bad condenser first if the coil checks out OK. A bad plug wire or connection is possible to. Another possibility is the magnets in the flywheel are getting weak and losing their strength.
These coils test OK at over 8,000 ohms.
Atom transistor ignition modules installed replacing the points and condensers.
One Zephyr, ready to go.
