I’ve been running a Couple different huztl/farmertech/holzforma 660 for about 2 years now. These are 100% to spec copies of out of date stihl pro saws (066, ms660,661)You can run oem parts in any combination if you want. Most of the farmertech (ft) parts are fine but some small things like chain tensioner you want oem.
The big plus of these copies is that you can get a running 92 cc saw for about $225 shipped. The catch is you put it together bolt for bolt. It’s easy and there’s tons of YouTube videos. If that isn’t your cup of tea they also sell fully assembled (but ugly dark blue) versions of these saws that are exactly the same as the kits and oem, just assembled. Those run around 325$ shipped.
I bought a big bore 56 mm piston kit for mine and I’ve milled quite a bit with it. I ran a 36” bar for a while then got into a 42 for bigger logs. It pulls a 42” chain fine. What I’ve found is that the chain sharpness, tooth profile, tooth sequence, and filing consistency are much more important than bar length/horsepower. You wouldn’t try and filet 200 bluegill with a rusty machete. Sharp precise chain is essential. I can provide some good places to start if you want.
ft is also going to be soon putting out their version of the stihl 880 and that would make a much better milling power plant but it’s still in the works. They also sell all the parts for a stihl 090 which is like 137cc or something crazy. It’s designed for torque which is what you want to mill, I just haven’t pulled the trigger on one yet.
the shipping from China seems sketchy I know but they actually are very reliable and pretty great withCS