OK - that is what I needed.
The first thing you need to do, if it has not been done already, is give it a good tune up. Change the oil and oil filter, air filter, and spark plugs. Make sure to get the proper plug, and gap them to .025".
If that doesn't help the starting issue, the choke may need to be adjusted.
Start the genset, and let it run until it shuts down - to the point that it will not restart.
Then check both plugs to see if you are getting spark.
If not, we need to look at the ignition system.
If you are getting spark, loosen the fuel line at the carburetor, and crank the engine.
Is fuel flowing?