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Several reasons for that,
1. Air is getting into saw through leak in manifold
2. Carb idle/rev screw is set too high
3. Carb idle mixture screw is set too weak (uscrew it a tiny bit and check) See my other answer link below for advice on that:
4. Fuel filter in tank is partly blocked reducing fuel flow. They should be changed once a year on a domestic saw, more often on a professional saw.
5. The springs on the clutch are weak allowing it to engage at too low a speed.
Carburetor adjustment for efco 152 chainsaw
Crank seals could be leaking air in,or carb settings incorrect.screw both mixture screws right in,then out 1.5 turns..set low mixture screw for highest idle,you may need to unscrew the idle screw a bit to keep revs down.adjust H mixture screw at full revs,to get max revs,then unscrew 1/4 turn.may need to reset idle
Most ofcarburetorhasthree buttonsto adjust.L(low),H(high)for fuel injectionat low and highspeeds.There is also aminimum (the chainmust be stationaryif it iswell tuned).The chainsawis setat low rpmthrottlewith screws(L ), and itsvivacityis setat highspeeds(Hscrew ).In the beginningis goodputbothto setat 1.5turnsfrom fullclosure.Andthen,if thechainsawstarts, you can adjusta carburetorwork.Carefulwith adjustingwithHdue to highspeed.
The standard setting on needles is to screw them in all the way and then back them out 1 and a half turns.
You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. turn the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn. You may need to readjust the idle speed so the chain doesn't turn during idle. Do the same for the high adjustment screw.
Hi 1tgriffin, My name is Dennis and I hope that will serve your needs. IDLE ADJUSTMENTS: There are three adjustment screws on the carburetor labeled H (for High speed MIXTURE) L (for low speed MIXTURE) T (for idle SPEED SETTING) They are located just above the primer bulb. If your saw floods so soon in the starting process the idle mixture setting can be set too rich and the speed may be set too slow. Remember the chain will not move when the idle speed is set correctly with a WARM ENGINE! Adjust the idle speed to just below chain movement WITH A WARM ENGINE this is just below the activation RPM of the centrifugal clutch. Let the engine run at a higher speed than idle until it is warm -- 3 min -- you may have to keep goosing it until then. Please don't exceed the limits of the plastic limiters when making adjustments. If you haven't adjusted the mixture screws you may just have to adjust the idle speed and that can start my turning that screw all the way in to the stop and then back out 4-1/2 turns for a good place to start. FAST IDLE -- Adjust the speed until the engine runs with out the chain moving. Adjust clockwise to increase speed. C clockwise to decrease engine speed. Accelerate the engine and if it stumbles and makes too much smoke it's too rich turn the LOW SPEED MIXTURE (in) clockwise in 1/16 a turn increments NO MORE at a time because a two cycle needs to run at a setting for a short time to really prove the setting. don’t run it wide open to warm it up but it should be at a fast idle. Nothing you do will be proven correct until the engine is warm. Good Luck Glad to be of assistance - please rate the solution because I will learn from your rating. Thank you