As for the starting, I have a habit of "half pulling " the starter until i can feel it sit in TDC, then I give it a hard pull. The big 064 saw wouldn't start any other way.
My first thought is about the choke settings Regarding the stalling out, but I'll ask silent j. He's a chainsaw wizard.

 @obee1: tanx --- the baffling thing to me is why it'll start to run shitty after a very constant amount of time. +/- 15 minutes ---

It seems like it'll warm up within just a few minutes so, I don't it's something related to the heat.. (???) maybe a blown head gasket (if it has one) ... it's been rock solid for years but, outta the blue it started running like crap

 @PedalShopLLC: maybe its cold? if its too cold the bar oil will get really thick and not run well, the chain stalls, and the engine freaks out. or maybe just clean out under the sprocket cover

 @FrozenTreads56: .....hmmmm... I have been using a different brand bar oil.

I'll swap back to the stuff I used to use.

 @PedalShopLLC: chain friction wont affect engine performance - the engine will just bog down if the chain gets too tight or has a lack of lube. If you determine it's actually a bar/chain friction issue, it could be that the chain is too tight, insufficient lube, worn bar, or your bar is a jacked up with resin from the wood you're cutting.

What brand/model saw is it?

when it bogs out, is it just randomly during normal use, or is it after having set it down while idling for a minute?; if it's idling rich, fuel can pool up here and there then essentially flood the engine when you pick it up and/or gas it.

could be that it's running a little lean (not enough fuel) and it's overheating over that time.

If it's not the

Tank vent or fuel filter could be an issue (plugged), but odd for that problem to present itself after 15 minutes...

is your muffler spark screen clean? jammed up muff (hehe) will lower RPM and cause the saw to run more like a rich condition.

might need a carb clean and new bits in the carb.

a blown cylinder gasket**, which is really a sucked-in gasket will present itself as a lean condition i.e., you have to tune the carb to give more fuel than spec because more air is getting in than is supposed to, crank bearings and intake boot (connects carb to cylinder) will also show up as a lean condition.

**(head and cylinder bolt onto the crankcase on pro saws; on cheaper saws the cylinder and top half of the crank case are one piece then the bottom half of the crank case bolts on around the crankshaft


Worst case is that you've already melted a ring and smeared it all over the cylinder wall - typically if this happens and it's not really bad, the saw will still start and run ok when cold, but once warm will lose compression and run like shit. easiest way to check for that is to pull your muffler off and look into the port then rotate the engine with the pull cord till you see the ring or rings.

 @silentj: thanks for the input...

yeah --- it's the dang 15minute-ish window of running fine and then running like shit that's got me scratching my head.

 @PedalShopLLC: blocked jet

 cool my man. congrats on moving one of your big pieces as well btw. hey, if you are having any logistical civil engineering headaches when organizing your new workspace, lemme know. a fresh set of eyes on an old problem is always helpful.

 @obee1: oh thank you... yes I will be hitting you up. I was uncertain about finishing the insulated studded walls with plywood before just starting but realized I would be a total travesty if I didn't make this the way I want it...its long and narrow... so shallow work benches will be the theme... It was going to be my studio but its too damn cold for the ink to even work out there so I get to usurp the basement guest room with the amazing view (inspiration) of the lake! That's what I'm working on now. it will feel good to get organized and ready to get rolling again.

 @sterlingmagnum: read "the war of art" by steven pressfield.

 its easily the safest saw i own. predictable, strong as f*ck. heavy, effective. no twitchy kickback bullshit from that motherf*cker. you wanna plunge cut? point and go. no drama. its a ported 064. silent j sold it to me and dialled it up to eleven before doing so.

 both makes great saws. i would never hesitate to buy a husqvarna, the universe has just seen to putting good stihls at fair prices in front of me more often than huskys.

 @obee1: haha makes sense! stihls are much more common to find for sale ive noticed. cheers man!

 Nope, it's an 064