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The list of things wrong could be endless. You didn’t mention what year the motor is but some of the ones from the late seventies with CD ignition had a kill button on them which could be shorted out. That would cause a no spark situation on both cylinders. If it has the CD style ignition, all ground connections must be clean and tight. They are very sensitive to poor grounds. If all of the wiring is good, the power pack itself may be going bad.
Other things to consider on motors with points style ignition would be the condition of the coils. If they are original, they are probably cracked and need replacing. The points, condensers, plug wires, terminals inside the plug boot and the plugs themselves are also suspect. If your motor has points ignition, NGK B6S are a good all around plug to use.