spark fuel compression
check spark by pulling plug and crank pedal while grounding plug to case ..should see spark.. if no spark inspect wire coil and finally magneto. don't forget kill/ off on switch.. you guys with solid state ignition should always have a spark plug on the wire or ground the wire when cranking... solid state does not like it when you pull wire and arc to case (causes high current due to no load) or no connection (causes extremely high voltage due to no current flow)
while plug is out stick your finger over plug hole and crank pedal should feel good pressure out of cylinder..if no pressure could be decompresion valve..
fuel probably the most common cause of small engines quitting
choke it pedal then open throttle..as you go from choke to open throttle the motor goes from rich to lean and somewhere along the way may start..
remember its only one cylinder and once flooded can take a while to clear out(you may be cranking for a while)