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Typical for any carburetor is 1 1/4 to 1 1/2 turns (out). These are just rough settings to get the saw running. Remove chain, turn idle throttle speed screw in to increase idle rpms so its less likely to stall. Follow mfg instructions for starting.
Once running, adjust low speed mix and allow a couple minutes to warm. Then re-adjust low speed and lower idle rpms by turning out idle throttle speed screw. Then with throttle wide open adjust high speed mix. If saw hesitates from idle to full throttle, open low speed mix 1/8 turn and readjust high speed mix.
If saw doesn't fire in 3 or 4 pulls remove plug. If plug is dry no fuel, if wet either no spark or idle mix to rich (or fuel metering may be fouled).
Go back to the carburetor adjustment screws and snug them down gently. Do not use force on those screws or you'll damage the needle valve seats. Turn both screws out one and a quarter turns out and start the saw. The motor should stay running.... if not adjust the screws until it stays running. Turn one screw in until you hear the motor start to stall, then turn that screw out just a little bit. turn the other screw in until the saw starts to stall, then turn that screw out a little bit. Now if the saw bogs at full throttle, turn one screw out one quarter turn. See if the saw runs at full throttle... if not turn that same screw in to where it was and try the other screw the same way. If you're good, you can adjust the screw while the saw is running to get the best full throttle run. This is not an exact science, and it takes time and many adjustments to get the saw to idle and run at full throttle. Good luck... and have patience.
This is fuel starvation, replace the fuel filter in the tank, check the fuel hose up to the carb for signs of leaks, or cracks, if the carb has no anti tamper screws, screw the L screw out 1/4 turn to richen the mixture, if the carb has anti tamper screws you will need to get the special tool to adjust them.
Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor is firmly mounted to the engine. Hope this helps!
Try cleaning throttle body with throttle body cleaning fluid. You can pick this up at any auto supply depot. Just follow the instructions on the spray.
If it stumbles at full throttle, the fast (high) idle screw is set too rich. Using your owner's manual, locate the high idle adjustment and back it off in very very small increments. Do this until the saw will run wide open without stumbling.
Yes, you will need to disassemble carburetor and clean with carb. cleaner. If you need tips on how best to do this, just let me know. Or you may need a new carb. kit.
Sound like the clutch is not disengging. The springs in it are likely week. Take note as to weather the chain stops when it is idleing. If it seem to idle at a reasonable speed and the chain does not stop turning, the clutch is most likely the problem. This problem can be caused by trying to work the saw without the throttle wide open. When the clutch slips it creates heat wich will over heat, and weeken the springs used to disengage the clutch. It is also possible that it was defective when new.
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