if it has a carburetor, it's running less than 10 lbs of fuel pressure. more like 4 or 5...
I would check and make sure I had spark first.
remove one plug wire from a plug, and insert another good plug. hold it against the manifold, and have someone crank the motor over.
watch for spark.
if you have a good crisp bluish spark, move to step 2.
see what the flow from the fuel pump to the carb looks like.
step 3 puts you back inside the carburetor you were working on.