Stihl FS38 problem

[SUKI]

I got in a Stihl FS38 that is back firing through the carburetor. I am going to try a ignition coil since I once had a chainsaw years ago that did this setting it air filter on fire.

Any other ideas? Already checked the crankcase gaskets and the spark arrester plus it has a new spark plug.

[38racing]

Flywheel key?

[SUKI]

Not acing like a flywheel key problem. Beside I would need to make a pin wrench to remove the clutch. I don't really want to spend $35 on an one time use tool.

I look around to see if I have a steel blank laying around to make one from.