How to access idle screws

Hi lloydlavalla...

Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
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one screw should be your idle adjustment one srcew will be the low jet start with a turn and a quarter with saw running at idle turn srew in both directions until it dies down then set the screw in the middle for the high jet start with the same setting but the final adjusment must be made with engine at full throttle adjust until max rpm is abtained and the back it off just a little bit too make sure you are not above max rpm

Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...
http://www.youtube.com/watch?v=3Lw0pJcEPYo&feature=player_embedded

try ajusting the idle up a bit and check the air filter 2

hi try increasing your idle speed ajustment is on the end of your throttle cable where it joins the engine good luck please rate this answer thanks

hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

ajust your mixture screw on your carb turn it in fully then unturn two and half turns that should get your mixture ok you mat need to fine ajust later

If you have a carburator still then you need to know more.
screwdriver method on feel/rpm gauge
Proper exhaust measurement.
Run her up to 650 rpm idle start adjusting mixture screw until max rpm obtained. back out a bit too be lean. Ajust Idle screw again for 650.
Turn on appliances as lighting and airco. If engine starts/tends to stall, vibrate increase the idle a bit more.

You are not ready with the engine if not doing ignition settings and valve clearances as well, etc.

Have you changed the fuel filter recently?

hi erdnaway

im dave hope i can help

technically the idle control on your vehicle is computer controlled and non adjustable. If the idle is high or low there is likely a code in your emission system (check engine light) and a sensor or emissions part that is not working properly or the computer itself. However if you look on throttle body you will find a slotted screw that will adjust the air/fuel mixture to get a better idle. When you find the screw be sure to have the engine running while you adjust it so you can hear the differences. If you would like to fix it properly you will need to the pull the codes from the computer diagnostic terminal. If you'd like to do that after adjustment of your air/fuel mixture post back. It would be a good idea to make a mark between the screw and the throttle body so that when you fix the emission related component causing the erratic idle you can put the screw back to its original position before restarting the engine