Hi everyone. I've been following this site for a long time but just recently became a member. I hope I'm posting this in the right place. I'm not a professional when it comes to chainsaws but I can see that there are some very knowledgeable folks here and I hope you can help. I've always been fascinated by chainsaws and started buying and fixing them almost a year ago. It's surprisingly addictive and I've been able to fix a couple dozen of them so far. I have a homelite 450 that has been stumping me for a long time. It won't start. I've replaced the spark plug, the fuel lines and filter, the impulse line, and the start switch. I've transplanted the coil and transformer from a running saw to it. I can touch the contacts that the transformer goes across and when I pull the cord it shocks me real good. I rebuilt the carburetor. I also checked the rubber carburetor boot for holes/cracks. The cylinder and piston aren't scored from what I can see and it has 155 psi compression. It acts like it has no spark. It doesn't even pop when I pour fuel directly into the carburetor. I don't know what else to check. Sorry for the bible length post but I want to present a complete picture of what I've done so far. What have I overlooked? At this point the only thing I can think of is getting a priest to perform an exorcism on it.