TROY-BILT WALK BEHIND 21 INCH MOWER

I HAVE A 21 INCH WALK BEHIND TROY-BILT MOWER. IT WONT FIRE AND NOT SURE WHERE TO START ON THIS MOWER. SERIAL NUMBER IS 11A-A230711. I DON'T KNOW WHAT ENGINE IT HAS.

TROY-BILT WALK BEHIND 21 INCH MOWER