This has come up again. Like many e-lux saws the consumer
Stihls has an engine unit, ALL metal, except for the seals, which
is bolted onto a plastic body, which some of you all refer to as
a crankcase, but it is not. I have seen this in Husky and Jonsered
before Stihl started this design. Some models employ the same fasteners to hold the bottom cap/crankcase bottom to the
plastic saw body, some have seperate fasteners for the saw
body and the bottom {METAL} cap. I doubt that these new
Stihls have a magnesium "crankcase", but are variations of
either the 021,023,025 series, or the 029,310,039 series.
If it is a 4 cycle, then it must be something altogether
different, and I doubt it will be made as well as the older stuff
anyway,