The owners manual is here:
A mower that has sat unused for 2 years will have dried gas in the fuel system that will need to be cleaned out of the carburetor and fuel jets with carb cleaner. The bottom of the carb. will have to be removed to tidy / clean up the carb passages. It is important to spary carb cleaner in the threaded area of the float bowl nut as that is where the main fuel jet is located. You should check for good fuel flow from the tank to the carb while the float bowl is removed. Poor fuel flow with bowl removed can be a clogged fuel filter, or fuel tank exit port. This is not a hard task it is just you have to pay attention to where hardware attached along with the gaskets for that hardware.
Two more things you must do is to make sure that the engine is fully serviced with oil
and that the safety handle bar is actually moving far enough to dis-engage the flywheel brake safety / ignition switch.
I am pretty sure with a little carb cleaning and fuel purging your mower will be fine. Fuel turns into shellac / varnish substance over a couple of years of sitting idle and you just need to get that cleaned out of the fuel system.
Thanks for choosing FixYa,