I have owned my Stihl 420C for 1.5 years and it has worked flawlessly...until now. Tried to start it as usual (1 pull with choke on & half throttle, then 2 pulls no choke) but it this time it never kicked over and I could smell that it was flooded. Pulled the plug and it appears that I am not getting any spark. Checked for continuity through the on/off switch in the handle. No broken wires going to the magneto. So I figured the magneto was bad, bought a new one, installed it and yet I have the same problem of no spark to the plug. Anybody have an idea of what I should look for next?