I WAS GIVEN A TROY BILT LAWN MOWER WITH A 42 INCH DECK. IT RAN BUT JUST QUIT ACCORDING TO THE OWNER. CAN'T START IT WITH THE SWITCH DON'T GET ANY CLICK JUST DEAD. JUMPED IT FROM BATTERY TO STARTER TO TURN IT OVER SO I COULD CHECK THE SPARK. NO SPARK SHOWED ON MY TESTER. FUEL IS FRESH AND IT RAN JUST 3 WEEKS AGO. I'M LOST ON WHAT TO DO.