So off to the saw shop today and raided the dead pile .034 av or so it says .Scored piston but has compression and I don't think scuffed the cylinder.Evidently a small leak ,probabley a seal .
Cheap as dirt ,needs a clutch cover which is no big deal and an air box cover .
I never measured the bore but found an oddity .This thing has a rear discharge muffler and the flatter cover like an 036 ,no baffle cage ,screen in the "gutted " rear half ..The "book" only lists this style of muff under 036 not 034 .
So now the big question does it make difference when the saw was made or where if it has this type muff ? I know a fair amount about Stihls but am far from an expert on their little perks of manufacture .I might assume that if the bore measures 48 MM instead of 46 it would be an 034 super but it doesn't indicate so on the cover which is more squared off than the other one I had .