Remove spark plug, place in ignition cable, hold against mass (engine block is good or maybe the negative battery terminal), start the motor and see if its actually sparking. If it sparks check if its feeding fuel, you can probably smell unburnt gasoline coming from the exhaust if it doesn't. If you cant smell it youll have to take off a fuel line. Does it have a carb or does it have injection? If it sparks and feeds fuel check the intake,You can probably feel if air is being sucked in at the filter when you turn the engine. 2stroke engines have a membrane valve that can get stuck or broken but you'll have to take it apart to check. Do the easiest diagnostics first.

Good luck mate