650/X-2 1 fat spark...then nothing.

91 X2, basically stock. When I stab the starter button, I get one bright visible spark on either/both of the plugs, then it just cranks and cranks with no spark. Obviously it won't fire. What am I missing? I've had the engine out for about a year because of a motor mount/ coupler issue. I hooked everything up as it was. WTF?
 
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