Well, had 3 saws from a local tree guy on my bench after dinner. The 044 would not shut off (had to use choke), the 461 lost a muffler cover and needed a recoil rope, and the 660 is not running right.
Spend about 20 minutes picking compacted wood chips out of the 044 kill switch , and it works just fine now (I also lubed it up).
Had a spare muff cover from a 460 for the 461, drilled a couple of holes in it and installed it, then did the recoil rope.
Started to check out the 660, but lost daylight (I took my little bench out side). Compression feels VG (a relief), the air filter is filthy, the plug not too bad, but the screw thing on the end was loose. He insists the fuel is OK, and I trust him. I'm going to start with replacing the air filter, fuel filter and plug, and checking that the muffler screens are clear, and will go from there. I may dump the fuel just for good measure, a little water from condensation can play havoc.