Troy Bilt chainsaw
 

The last time I used my Troy Bilt chainsaw it wouldn't shut off. I had to choke it down. The I/O switch wouldn't work. Anyone else had this problem? Cramer

I have a Husqvarna that does that. I removed the cover to inspect-there's a metal wire tab that makes/breaks the contact for killing-it slid out of the slot it was in. It was chronic problem easily solved by a small dab of precisely placed caulk to keep it in it's slot.