LT 150 has no spark. I have replaced the coil, still no spark. Took the ground wire off the coil, no spark. Put a coil tester on the plug wire and grounded the tester, no spark. I don't believe there are any bad safety switches. All the switches appear to work as usual. Isn't a fuel problem, because there is no spark. What have I missed. Also pulled the flywheel to see if the key was ok, it was.