Question about Poulan Pro Chain Saw 46cc 20"

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Idle how do i adj. idle

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The 'H' and 'L' jet needles on late model saws have 'D' heads requiring a matching screwdriver that only servicing dealers have (thank the EPA). The idle speed screw is owner adjustable and is set so that the chain stops turning, but the engine keeps running. Hope this helps!

Posted on May 28, 2010

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not sure what you're trying to accomplish but the idle screw and low speed mixture screw work together. most 2 cycle trimmers idle happy at 3k rpm's... just before clutch engagement

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1 Answer

Runs slow


In California the new blowers have sealed mixture adjustments and you need the have your carb. mixture adjusted be a qualified shop. If your carb. HAS mixture adj., turn the high speed mixture so it runs best at high speed, then turn another 1/8 turn counter clockwise to be a little rich. Then at idle adj. the other screw till it idles best.

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Tk carb ? sthil trimmer has 3 adj screws ,how do you adj?


One adjustment screw (probably Phillips-head) is the Idle speed adjustment screw. Turn it in, to increase idle speed (it moves the throttle plate)...turn it out to slow idle speed down. The other 2 screws are the Low mixture screw and the High mixture screw. The L screw is closest to the engine and is used to adjust the engine at IDLE. The H mixture screw is to be adjusted when the engine is at wide-open throttle to get the proper RPM's....not too little and not too much. Here is a tutorial by Zama carburetor reiterating what I have just told you and HOW to go about your adjustment.
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When u adj a kohler carb you adj fuel not air. Always adj the high speed then low speed. Then adj the curb idle. 1.5 turns out is a good starting point. Then tweak it after its warmed up. Hope this helps

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1 Answer

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First there is an throttle idle screw that adjust the amount of throttle at idle try turning it ccw until it idles down. If this adj is at its lowest level then adjust the L screw until you get the idle you want. Then try to rev up it should rev up without hesitation if not hold down on throttle untill you get max rpm it it tries to cut out etc. at high rpm adj. the H screw until you get max rpm. then adj your L screw again for proper idle. You may need to do this back and forth for awhile until you get max. performance.

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1 Answer

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1 Answer

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adj idle with cable adj thanks Trevor

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