I AM GETTING ONLY INTERMITTENT SPARK TO BOTTOM CYCLINDER AND NONE AT ALL TO TOP CYLINDER. I'M CHECKING THE SPARK BY PUTTING A SCREWDRIVER INTO THE PLUG WIRE AND HOLDING IT CLOSE TO THE TIP OF EACH PLUG WHILE TURNING THE MOTOR OVER. IS THAT AN OK WAY TO CHECK IT? IS THERE A BETTER WAY? I'VE OHMED THE KILL SWITCH AND IT WORKS SO AM CONVINCED THAT'S NOT THE PROBLEM. MOTOR WAS STARTING AND RUNNING FINE DAY BEFORE AND HAS ALWAYS DONE SO FOR THE YEAR I'VE HAD IT. NOT SURE WHERE TO GO FROM HERE. THANKS FOR ANY INFO.