If the flywheel is off (don't forget to keeper it - I usually use a
couple of big spanners) you can break the primary circuit and wire a
battery or other power source in series - measure the primary resistance
first and select a voltage to give an amp or two. Flick the points and
you should get a spark if all is well. Don't try with flywheel in place
as you risk damaging the magnets.
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