Been trying to get my FS-36 going (never did) but while routing through it, I noticed the cylinder head gasket was in a few pieces and sucky looking. This part:
http://www.ebay.com/itm/NEW-Stihl-OEM-Cylinder-Gasket-FS36-FS40-FS44-FS-36-40-44-4130-029-2300-/151926360922
I don't know that I live...