Welcome to the forum. I have the same machine! I had the same problem on mine, turned out to be the spark plug boot, it came apart inside the boot. They simply screw on the wire. If that fails, Can you confirm that you have voltage at the coil? You should show 12 volts with the key on, next check to see if you have spark at the plug, these are the simple things! Hopefully Arcticfrost will chime in, he is pretty sharp on these things!