Test for spark. Make sure the air filter is clean. Then make sure fuel is getting from the gas tank to the carb. Old rubber fuel line deteriorate and stop up small ports and parts in the carb. An inline fuel filter is a good idea on these larger engines. Sometimes, a larger B & S engine needs the OH valves adjusted to start easily and run properly. If after attempting to start, does the new plug get wet or even smell like gas? You should always use gas LESS than 30 day old. Gas goes stale like bread and milk. You can remove the fuel line from the fuel tank at the carb to drain old gas. You can also remove the carburetor bowl to check for water and sediment (which need to be cleaned out). Check these things and post back.
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