Another update..... Problem fixed!!
So as some of you know this saw has been a thorn in my side since day one. Saw ran fine til it got hot and then would refuse to go back to idle amd idle erratically..
It would pass pressure and vac tests. Been throwing parts at this saw for 6 months, nothing would make it run right. Thank god im sitting on a ton of 576 parts.
So that brings me to this morning.. I worked on a new poulan homeowner saw for a buddy on weds. Saw had a zama carb of some kind, similar to the carb on the 576 just smaller. It had running issues.
The poulan zama had a loose throttle plate which is the part that houses the throttle and air injection butterflys. The screws were backed out.
That gave me an idea....
I checked the screws on the brand new 576 carb off my saw and they werent loose but weren't what I would call tight either.
I pulled off the throttle plate assembly and noticed that theres a plastic plug behind the throttle plate that seals off a hole that goes into the H circuit. That plug isn't on the IPL for that carb and isn't present on the AT carbs I have. Had no clue it was there.
The plug was leaking fuel, there was fuel all over the throttle plate gasket in the area behind where that plug sits. I noticed it right away.
So I cleaned the cavity where that plastic plug seats and sealed it with motoseal. I also put motoseal on the throttle plate gasket and stuck it back on the carb.
I then put the carb back on and tried the saw.
First thing I noticed was that the saw ran different. It was VERY rich at idle and was idling very slow. (Hummmmm almost like someone was tuning around an "air leak"
)
Had to turn in the L jet 3/4 turn and the idle screw 1 turn to get it to idle.
Just put a tank through the saw and with some tuning it now runs like a top and more importantly doesn't lean out after a big cut!!!!
This saw has been a battle, cost me some time and some money but I got it beat!.
Hopefully this thread will help someone else down the line.