Q: lawn mower won't start and i need advice

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I have a '74 onan ss16 twin engine on a 1974 sears suburban tractor. I have been working on it for roughly 1 week now and i havent been able to get it to fully run. It has a quite outdated point condenser ignition system that is mounted in a box like structure. i have power to all components of the ignition, i am getting full fuel flow throughout the valves, both spark plugs are fully functional and are making spark however when placed on the head and back on the mower i am not getting any spark at all through the spark plugs and i dont understand. please help! thanks

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