Garden

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

The goal of adjusting the idle-mixture screws is to achieve the highest possible idle vacuum at a set idle speed. If the idle speed increases after you adjust the idle-mixture screws (which is likely), be sure to adjust the idle speed back to the base speed.
Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm. Idle rpm range should be 950 to 1050 rpms. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly.
In order to increase the engine idle speed, tighten the screw clockwise. You can use a Phillips head screwdriver to turn the idle screw clockwise. Turn the screw once or twice to make minor adjustments in the idle speed, or three-four times to significantly increase the idle RPM.
The idle speed control mode is used to prevent engine stall during idle. The goal is to allow the engine to idle at as low an RPM as possible yet keep the engine from running rough and stalling when power-consuming accessories, such as air-conditioning compressors and alternators, turn on.
For regular cars, idle speed is typically between 600 and 1,000 rpm, just enough to keep the engine`s ancillary systems going, but not enough to move the car forward much.
It`s important that all idle mixture screws be adjusted the same way so that the output from the carburetor idle circuit is balanced across both idle mixture outlets. One to 1½ turns out is a typical place to start.
Disconnect the idle air adjustment valve by locating and disengaging the electronic connector that holds it to the throttle body. Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it.
The idle speed screw just makes this gap slightly bigger or smaller. Like you said, the mixture screw actually adjusts the fuel air ratio. Well the mixture screw changes the mixture of fuel to air and the idle screw changes the idle speed.
The letters on the screws represent High (H), Low (L) and Idle (T). The H screw regulates the Air/Fuel mix during high RPMs, while the L Screw does the same during low RPMs. The T screw regulates how much fuel is sent to the carburettor while idling until the throttle is pressed.
There are many factors that can stop your chainsaw from running, including a bad spark plug or dirty air filter. There are simple problems: a broken fuel line, bad fuel, wrongly calibrated high-low adjustment screw. Also, more complex issues like a damaged carburettor or an engine compression problem.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

I have a new Husqvarna chain saw and when it is turn on its side it dies whats wrong.
ANSWER : Its hard to say what is causeing this, there will always be a slight difference in rpm as it moves from side to side, the fuel hose should move in the tank and follow the fuel, if the machine is idling to low it may stop as you turn it, make sure the fuel hose is not trapped in the tank.

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Craftsman 28cc 16" chainsaw wont idle – Craftsman 38cc 16" Gas Chain Saw
ANSWER : If you’ve already tried the idle adjustment screw and that didn’t work, you need to turn the low side adjustment CCW a quarter turn and try again.

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<!– from fixya rte –>How far to turn idle screw out after rebuild – Poulan 14 Woodshark Chainsaw
ANSWER : You’ll have to do a visual on this one. But you turn it out until the throttle plate just starts to move, where it can get a little air. This is the initial start position and you can fine tune afterwards.

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How do you adjust high, low, and throttle on echo 3400 chainsaw
ANSWER : Ok, this is an easy job, and a quick tune up. First start up your saw, rev it some so it warms up. Next, make sure your saw idles, if not just turn up the idle a bit first before this. With your saw idling on the ground, turn the L screw about 1 turn either side of where it is, and listen to obtain the fastest and smoothest idle, that takes care of the L screw. Now the H screw must be adjusted while the the saw is at full throttle, turn the H screw and listen for maximum and smoothest engine speed. I sugest this be done with the chain and bar removed from the saw. After you adjust the L and H, then adjust idle to suit.

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Where is the idle adjustment screw on my 42/18
ANSWER : On the left side of saw above primer button is a hole going to the carb, the screw is there below switches.

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HOW DO YOU ADJUST HIGH AND LOW SPEEDS ON HOMELITE BLOWER UTO8087 IF ONLY 1 SCREW ADJUSTMENT. 1 PORT FAC. PLUGED OFF.WHAT SHOULD IDLE RPM LOW B APPROX./ HIGH RPM
ANSWER : All the pictures I have of this carb show two adjusting screws.

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What is correct adjustment for high and low scews
ANSWER : With the saw warmed up adjust the low for best idle.Adjust the high for best speed then adjust a little richer from that point.Caution……Running at best speed (power) settings which is “lean” will 90% of the time burn the piston……thats why you go a little richer on that setting.

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The engine idles way too fast and will not correct with the sow speed adjustment
ANSWER : Make sure that you are adjusting the idle speed screw, not the idle jet screw (L). If you are adjusting the proper screw, then it is possible that the throttle trigger assembly in the handle has a load of sawdust/dirt that blocks proper return to idle. Take the handle apart carefully, and make notes on how the parts go back together. Check at the carburetor throttle assembly to make sure the throttle arm returns fully to the idle speed screw when the trigger is pulled and released slowly. Check the throttle spring as well to make sure it is undamaged. Hope this helps!

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