Can't get home generator started. Don't believe it is putting out a spark. Just replaced the plug and still doesn't appear to spark.

The usual things that stop the motor from running are either spark or fuel problems. To test for spark,remove the spark plug, reconnect the plug wire to the plug and have the metal body of the plug rest on a metal part of the engine. If the ignition system is OK you should see a spark at the plug electrodes as the motir is turned over. If no spark then it is either the plug wire or the coil inside the magneto so you will have to take it to a repair shop. If there is spark then it is likely to be a fuel problem of either too much (flooded) or too little which could mean dirt in the fuel that has got into the carburettor and clogged the small passages inside the carburettor which would then mean a cleanout.