Ok, more details on the jugs, pistons, carburetors, and flywheels...
I checked all 8 of my jugs - they are all 56ZN4, presumably all Mahle. The ones that weren't installed on saws, I could also see if they had additional markings -- all were Mahle, and were either marked W1 or W2 as well.
The carburetors - all Tillotson HS. The 110 has a Tilly HS1010, also stamped E91. The other saws were all HS112A with one exception -- the latest 111S I have #717131 has an HS112B.
All the flywheels are aluminum except for the saw that's either a 110 or a 111 - it has a plastic flywheel.
Pistons -- good news -- it looks like a Dolmar 166 piston may fit. I compared the two and they're pretty darn close. Both pistons are for a 56 mm bore, so the skirts measure about 55.91 mm. The piston pins are 14 mm for both, so the Dolmar piston should install just fine on a 111 crank. The compression height (I think I'm using the right term here) appears to be the same on both -- 25 mm -- that's from the center of the pin to the top of the piston. The 111 piston has a very slight dome and the 166 piston is a flat-top, but I don't think it's enough to make much of a difference at all. The 166 piston has a bit of a longer skirt (I need to try to get some measurements) so it may need to be trimmed just a tad to fit. FYI -
@leeha had some beautiful 166 pistons custom made by Wiseco; I got one from him and probably need to source a few more.
Also still searching for a few more parts; I really need an air filter cover for a 111S. If you have one or know where I can find one, please message me. I have 111 parts to trade or I can trade green paper, too. Also realized tonight that I need a flywheel, too. One of my saws has a jacked up flywheel.
thanks
Scott