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Testing Boyer

Scratching Box Leads

With the spark plug laying on the cylinder head, Scratch the Black/Yellow and Black/White leads from the ignition control box on each other.
Please Note: This test ASSUMES the battery, wiring, connections, switches and grounds are in working order.
Although a lot is attributed by other web sites to this test, it is very possible for the box to be in perfect working condition and you will not see a spark at the plug.

If the battery, wiring, fuses, switches, grounds, ignition coils and Boyer control box are in good working order the spark plug should fire a series of rapid sparks.

If the spark plug doesn't fire it could mean the ignition box has failed.
It could also mean the box is not properly wired into the motorcycle, a coil has failed, or the motorcycle's electrical system is not able to supply enough electricity to run the ignition.
Low battery voltage - (charge battery), high resistance battery (sulfated should be replaced), compromised charging system, corroded: connections, fuse holder, electrical switches or bad grounds cause more problems than failing boxes.

Note" Turning the ignition switch On and Off will fire the spark plug on most Boyer ignitions, it WILL NOT with the Triumph/BSA and Norton ignitions. The box does not turn on until it receives a trigger voltage from the timing plate.

Special thanks to RF Whatley for comments and suggestions