Spark help

Blaster has been running mint this season, until yesterday! Now it will do one spark with both plugs and then no more when it's cranking over. Any ideas?
 
ok! looked inside the box. (pause) and it is epic no corrosion and perfectly clean. stock cdi and everything is within spec on the ohm chart. start switch works mint. cranks over with no prob and batt is fully charged. how about new plug caps? can that be it.
 
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