There is only one points on this engine so both sparks always fire simultaneously. Only one cylinder is firing at a time so basically you are just sparking in the exhaust stroke on one side. Having the timing 180 out will just change which cylinder fires 'first' per rotation cycle. The shop manual (I just packed mine! I am moving) should have a diagram, but I think I am actually running mine 180 off from the pictures on here. I don't remember.
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