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Carburetor adjustment for efco 152 chainsaw - Garden

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Before attempting the following task, make sure you are not wearing anything which might catch in moving parts and that the floor around you is clear and that the saw is firmly held in the vise and that you are wearing suitable hearing protection.
I Totally agree with Eugene and his statement about original settings, but be careful not to over-tighten mixture screws when screwing in to seat, as carb body is aluminium and screw is steel, so overtightening the screw could distort the jet/seat in the carb body and that is irreversible, the carb will be ruined if you do that.
There are two screws for mixture and one screw for idle revs/speed. The mixture screw nearest the engine is the idle mixture and the one furthest away is the high mixture.
To adjust the low mixture first mount the saw in a vise carefully so the bar and chain is pointing away from you. After you have done the initial adjustments as Eugene has described, start the saw and after warming it up for a short while, let it idle and then screw the idle screw in very slowly until the engine starts to rev up and then a little bit further and, just when it starts to die, back off the screw 1/2 a turn turn down the idle revs/speed with the third screw to to a speed where the chain does not move. When that is done it does not need to be touched again
To adjust the high needle a rev counter is necessary, but in the absence of one, try the following and if it does not work, take the saw to a professional as the wrong high mixture could blow the engine.
Make sure the vise is tight on the bar and that the chain is in no danger of hitting anything when it turns fast, rev the saw up to full throttle and listen to the engine (wearing ear muffs) and carefully keeping your clothes clear of the chain, turn the screw out until the engine starts to slow down, and then screw the screw in until the the engine starts to 4 stroke, ie starts to cycle a tiny bit (the revs go up and down a little) and that is the correct setting for that saw.

Posted on Dec 13, 2014

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Initial settings is 1-1/4 counterwise from seated position.
Adjust for best idle first then best full speed with a slight 4 cycling sounds.

Posted on Dec 12, 2014

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Posted on Jan 02, 2017

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SOURCE: I need help with a carburetor adjustment on my chainsaw.

this site gives alot of helpful hintshttp://www.arboristsite.com/showthread.php?t=5208

Posted on Mar 02, 2009

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SOURCE: husqvarna chainsaw carburetor adjustment

Find the 2 screws. There will be a (h) high and (L) low. These are for hig rpms and low rpms. First tighten the screws. Then unscrew them about 1-1/4 turns. Then start the saw and let it warm up. Start with the high rpms first pull the trigger all the way then adjust the screw in 1/8 turns either way until it is running good at high rpms. Then work on the L rpms. Get the saw to idle then pull the trigger, there should not be any hesitation when going from L to H rpms. Just adjust the low same as the High. They have to work together so if the high is good and the low is not just right turn the h a small amount. If you have any more questions let me know

Posted on Jun 20, 2009

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SOURCE: adjusting carburetor

Does saw try to run? Initial settings are about two turns out from CW stop. Set high speed (on warmed up engine) to 4-stroke with no load, but smooths out with light load (cutting wood). Idle is set for fairly smooth idle, but engine picks up with throttle without lag. Idle speed setting is somewhat below chain drive clutch pickup, but allows engine to keep running.

Posted on Jul 04, 2009

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SOURCE: what is the carburetor metering lever adjustment for an

Clarification Request
Posted by slohry on Apr 10, 2009
What kind of carburetor does it have? Zama, Walbro? And what model carb?

No response to clarification request... delete this question.

Posted on Sep 16, 2009

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SOURCE: carburetor tool

Unless you are skilled enough to make your own, you are stuck taking the saw to a servicing dealer as they are the only ones allowed to possess the necessary 'D' head screwdriver. Give thanks to the EPA for mandating the prevention of mal-adjustment pollution.

Posted on Jul 07, 2010

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1 Answer

Setting carburetor


David, may vary by make, model and engine size. I turn the L(low) and H (high) speed screws in till just seated(bottomed out) lightly, then I turn each screw out 1 complete revolution, start saw and tweek adjustments from there on the L and H. Check the attached links,instruction and guides, Good luck
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