need help with a 140cc stihl engine

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I got an engine here,,, cant see any markings on it other than
66ZN2
A1
D5
W1
Mahle
It has a compression release
I was told it was a 140cc stihl chain saw engine..
I wanted to get some specs on the engine, and where to find some parts for it,, muffler, ignition, carb parts ect..
Before I get too far along,,, I mostly want to know how much HP this motor has in stock form...
Any help would be greatly appreciated..

 

[arborterra]

It's junk, but I will buy it really, really cheap.
Is it maybe 137 cc / 090 engine ? Post a pic.