Agreed on the lean factoy settings. Already removed the High/Low adjuster lock. I cut with the saw 2 days ago for 3 tanks of fuel. If I fuled/oiled it up quickly it would refire easily and run good. Finally I needed a break so I set the saw down for 15 minutes. Darn thing would not retart or prime at all. Grabbed another saw and continued on. Thought I had a carb kit but this has a Zama on it. Might try to find a kit locally today. I tried the loose gas cap trick as well. No difference. I'll snug the bolts etc. recommended to see if any are loose.
On another note, anybody have a opinion on the value of a 3400, 3700 and 250 that are basically barn finds (complete units)? All have reasonable compression and the 3400 fires then dies. All will need the usual cleaning/carb kits/chains/lines etc.