Blades and belts DO NOT MOVE when your trying to start it unless you unhooked the blade safety . If it is an electric PTO there isn't enough power to start the motor , turn the PTO ...
well...voila! ...make sure you start with good fuel in the tank....i like to install a shutoff valve before carb work...so gas spillage doesnt get out of hand....first..check the fuel shut off solenoid....hold it as you turn the ignition on and off....you should feel a thump inside it....see picture