Chainsaw starts but dies immediately - Garden

open or close the "chock" accordlly

Carb diaphragm or spring or flap valves could be the problem or the engine crankcase compression might be low due to poor sealing or the small vacuum port from the crankcase to the carb might be blocked.

Adjust the choke or carburetor. In case your chainsaw stalls when the engine is idling, ensure that the choke is set properly. To do so, first try releasing it to adjust it, and then move the plate and tighten all screws once again. To loosen any grit, spray carburetor cleaner spray on the choke's shaft. The carburetor may also need to be adjusted; consult your owner's manual which will guide you on resetting the idle mix screw.

Try removing the fuel cap for a moment to see it can be restarted immediately. If this works, check the fuel tank vent for plugging problems. Also, check for spark at the plug when it dies--if no spark, try a fresh plug gapped at 0.020". If nothing, the ignition module may be failing with heat. Good luck!

Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor is tight to the engine. If the H jet needle has a 'D' head, you will need to take the saw to an authorized service center as it requires a special 'D' screwdriver that only they have. If the jet has a slot head, then turn the jet CCW until the engine 4-strokes at speed unloaded, but immediately 2-strokes when cutting. Hope this helps!

Check the fuel filter, air cleaner, and muffler for plugging. Inspect the fuel lines for decay or other damage. Make sure the carburetor is tightly fastened to the engine. If no help, turn the H jet needle CCW about 1/8 turn--if correct, the engine should 4-stroke at speed when unloaded, but immediately 2-stroke when cutting. Hope this helps!

there is two plastic adjust jets with a little grove in it, that is to adjust the airflow and petrol injection, one is red and one is white (normally) it is located next to the air-cleaner near the bottom of the carb. what you should do is get a long enough screwdriver (flat that will fit in that grooves) start the machine ref it and adjust the white jet to your right (very slowly) and see if it is running after releasing of the throttle, if it dies start again ref and adjust the red one to your left(very slowly) and leave the throttle and see if it idles, if not try step 1 and 2 again until it idles. those adjust jets has a kind of sharp point, those 2 sharp points must not cross each other and remember if you start you must undo the choke immediately, otherwise it going to die in any case, maybe that is your problem

Immediately after saw quits, while everything is still hot. Sometimes ignition modules quit working when hot.
Ignition Coil Test
SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You don’t have to bend up the electrode.

Loosen fuel cap when it starts to die, If that fixes it it has a fuel vent problem.

If you did nothing to the carburetor adjustments, are using a fresh (3 months or less) fuel mix with the same oil/fuel ratio, and are operating at the same elevation there is a reason your saw is acting up.
It sounds as though there may be a fuel delivery problem. Check the fuel filter on the free end of a hose in fuel tank (manufacturer recommends an annual replacement). Check all fuel delivery lines especially at fittings and bends for cracks and holes. If those are good then the likely cause is internal parts of the carburetor. HTH
Lou

Try fresh fuel making sure oil and gas mixture is correct. Carb might need cleaning and adjustment.

If your chain brake is not engaged, which i am sure you have checked, look at the air breather filter or the exhaust muffler which could be blocked with carbon.