The model number will be stamped on the side of the valve cover.
But if you are getting no spark, let's start with the basics.
First, do you have the switch turned on?
Have you checked to make sure the crankcase is full of oil?
If so, follow the spark plug wire to the coil. You will need to remove the engine shroud to access it.
At the coil, disconnect the shut down wire.
If the plug still does not get spark, the coil is bad.
If it does get spark, there is either a short in the shut down wire, the shut off switch, or if the engine has a low oil level switch, it may be bad.
Let me know what you find.