If it requires the choke to run it is running lean. Continued operation in a lean condition will cause piston & cylinder failure. Determinr why it is suddenly running lean.
If you did nothing to the carburetor adjustments, are using a fresh (1.5 months or less) fuel mix with the same oil/fuel ratio, are operating at the same elevation, and the air filter is clean, there is a reason your saw is acting up. Most often it is 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 are dirty or have failed. HTH Lou
The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
If the saw is equipped with a primer bulb, the output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly.
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