Let it settle for 48 hours,
replace the air filter if it is covered in oil or dirty in some way,
turn on the fuel,
prime the generator till you can smell fuel [ this should flush any oil in the fuel line] and leave it to evaporate away as you have just flooded the engine/spark,
check the oil level in the engine and top up as required,
clean the spark plug
try starting the genny as normal
if it doesnt start keep cleaning the spark plug between times as it will likely be dirty. If after a few times this hasnt worked you may need pro help.
