Thanks for the info. I thought it was about a 46cc since it is real close in size to the 54cc I have. I thought the 46cc had vertical fins on the top of the jug? I tried looking up the part numbers and never found them. What saws had the 46 in them? If I can get the model # I can research the part numbers. I have not found a reverse part lookup online yet.

I have not really looked at the Stihl yet. It has good compression and the piston looks good. I think the crankcase is built into the body of the saw though. It looks like a thirty-something cc.