to answer in order: he was probably trying to adjust for the altitude after watching me do so. He has not admitted that he did mess with the carb....just the oblique reference that he could never figure them out and always made a hash of them, along with a request for help and a non starting saw.
SEAM, your choke return idea might bear looking into:
saw woulds not start choked or unchoked. compressed air cleaning of filter and saw in general (pulled of air filter not overly dirty) blew out. dumped gas from his prior attempt at starting it as I have no clue as to its age, (though it smelled fresh who knows?) fresh 40:1 no start, after multiple try's i pulled plug, flipped saw upside down and cranked no excess came form the spark plug hole but the plug itself was oily. cleaned plug with parts cleaning/wire brush checked gap dried off plug with compressed air put her in and it semi started choked. unchoked tried again and after playing with it a little got it to run for more than a couple of seconds. At that time it idled very slow and every time I pulled the trigger it stalled so I let it idle about a minute and then turned the idle speed screw up about1/8 of a turn and got it to idle a little faster it no longer stalled but bogged quite a bit if I hit the throttle. played with the low speed to eliminate the bog and had no luck, so I then played with the high side and got rid of say 99% of the bogging but it would not run very well at high speed, so I reversed things and went the other way got it to run somewhat OK at higher RPM but then the bog was back. never would properly 2stroke/4 stroke out fo the cut...seemed like it was overly rich the entire time.... my tach was at yokosuka and not the cabin, so I could not tach it to see what its RPM's were but it seemed a lot lower than any of my huskqvarna's do at WOT.
what is the no load speed for this unit out fo the cut?