The saw seems to be getting too much gas. with the filters off i can blow air in the carb and it does fine. i cleaned the needle valve and it does the same.

The only thing that stops gas going into the carb is the needle valve and seat in the bowl of the carb.
Doing the same thing with 2 different carbs sounds like trash in the gas tank flowed into the carb and is holding the needle valve off the seat allowing gas to flow all the time.
Clean the tank. Clean the trash out of the needle valve/seat. Add a small engine fuel filter between the tank and carb.
You should be good to go.

this new gas is a carb killer you will need a new diaphragm for the carb and there is a little screan next to the needle and seat that can be cleaned. about a 5.00 repair if done right.. use marine gas

you have a problem with fuel getting into the carb bowl. so either fuel line is stopped up or the needle valve hole is stopped up. should be a simple problem.

Clean it again you missed something or maybe a gasket is on wrong. If you went through all of that it should run fine. Stihl usually rebuilds and runs well. Slow down turbo maybe you got a little ahead of yourself. Good Luck...

sounds like u have a carb problem,ether theres debris stuck in needle valve needle is stuck open or the check valve diaphram is bad.take carb off on one side there is a plate with 4 screws remove then agasket and diaphram remove them some times they stick to carb so use a razor blade to go underneth diaphram all around from center youll see a metal see saw with a pin going through if u push on center it will lift needle valve on other side make sure it goes all the way down or remove by removing screw that holds pin in and blow out with air lightly may blow seat out after that on other side of carb take other plate off by center screw that diaphram has 2 little flaps check valves make sure they are limber and not wrinkled or bent if so u can get new ones at good mower shop or parts supply hope this helps

clean air filter, and clean carb with spray cleaner.make sure carb choke is free to move.look for vacuum lines off or stopped up. if trash is in the carb just draining it might not be enough,you may need to clean the jets or float needle valves too.

sounds like the float needle valve is stuck open or it got lost as you were putting it back together. take onother look at it.

the problems is in the carburetor, common problems when unit does not run often and rust get get build up. get some automotive carburetor cleaners and spray it heavy in the carb, don't worried about flooding it or damaging anything, it will dry out faster than gas. (use little gas if you need to) try to start it up and get it running with the carb cover off and continue to spray carb cleaner in the carb while the engine is running, do this couple of time and hope that would clear it out. if that don't work you will need to take it apart and clean it. you have small tiny object obstructing the carb flow. the unit doesn't have a fuel pump, it run on gravity feed, the carb are easily obstructed. hope that help a bit

Sounds like trash in the gas supply is holding the float needle open causing the float bowl to overfill. Remove the petcock from the tank and clean out the water trap bowl (some petcocks don't have a bowl). Drain some gas from the tank through the petcock hole to help clean trash out of the tank. Install an inline fuel filter
between the carb an the gas tank.

Now clean the carb one more time using an air hose to blow trash out of the float seat and then blow out the fuel line as well. Be certain the float level is set at the proper height. This should solve the problem for you.

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I sounds like there is some dirt under the needle valve in the carb. Change the fuel filter first, if it is falling apart then it is very likely a piece of it got in the carb. Try spraying some carb cleaner directly into the fuel inlet to see if you can flush it out first, If not then your going to have to pull the side closest to where the gas goes in off the carb take out the little screw and clean under the needle valve.