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First thing, try new gas.
If that doesn't do it, you need to adjust the low and high speed circuits on the carb. A good starting point is 1.5 turns out from fully seated. On that saw I'm not positive if you will have access to the adjustment screws unless you pull off the plastic caps that may be covering them.
Usually when purchasing a new Carb, they are set very close. No adjustment needed. But if you want to play, turn both the High and Low screws all the way in then turn them bot out about 1.5 turns. that should get it started. The you will need to tweak the High sped and then the low speed and then the Idle
There are many problems with small engines that can make them hard to start. The carburetor is one of them. Make certain that you have adjusted the new carburetor correctly. A good place to start is 1 1/2 to 2 turns counterclockwise from the closed position on the main fuel adjustment needle. Adjust in or out to best performance when engine is running. Some carburetors also have a fuel adjustment needle for the idle mixture. Start off with 1 to 1/2 turns counterclockwise from closed and adjust in or out to best idle performance. Other potential problems include bad spark plug, ignition system (points and condenser in your unit?) and a defective intake and/or exhaust valve.
Start out with 1.5 turns on High speed jdet and 1/2 turn on the low speed. Make sure plug is not wet, better yet install a new one. Clean, fresh fuel and give it a pull.
Your Stihl dealer should have a parts department where you can get a new primer bulb. Also check the fuel lines to make sure they haven't cracked or come off.
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