New carburetor in stihl ht75 help

[brackisharborist]

I inherited a very old stihl ht75 polesaw that had sat for many years and it ran, but very poorly.

It came with a single screw carburetor.

It also didn't oil the chain, but I dissected the gear Head and remove the pump, it was caked with debris. Oiling like a champ now. I also packed the gear housing with grease

I bought the $12 eBay three-screw carburetor recommended on many threads here.

It cranked right up, but once hot, it tended to die when idling.

I got the manual online, and in the carburetor adjustment setting (it assumed I had a three screw carburetor), it recommends first turning both the high and low all the way counterclockwise to the stop, then the low back CW one full turn.

Well, both took a lot of turns CCW and of course I didn't keep track. I got nervous, and I didn't even unscrew either all the way for fear that the screws would come out, no stop?

I screwed both back clockwise best I could from memory, but now it won't start

So now I have a randomly adjusted carburetor. I have fussed with it a bit, but I feel like I am now shooting blindfolded.

Of Course, the next section in the manual, "fine-tuning", would have had me merely adjust the idling screw. Lesson learned. Read all the directions before picking up my tools

Does anyone have any advice on how to get this carburetor tuned again?

 

[brackisharborist]

So I've done a little reading. I'm going to try screwing high and low all the way in, backing out a full turn on each, then backing out the high half a turn at a time until it cranks, adjust as needed at full throttle, then go to idle, and do the same adjustment with the low, then fine-tune both, then more fine-tuning with the low air.

I will report. Any additional insight?