How do you adjust the idle on a 034 Stihl Chainsaw?

Okay on 2-stroke engines you are going to have 2 idle screws. (If you do turn screws, remember how much, so you can turn them back if you need to.)

Remove the plastic housing/cover of your chainsaw (if you cannot do this then you probably don't want to go any futher.)

Locate the Carburator, and there will be 2 tiny adjustment screws, you can tell it is an ajustment screw because it usually will have a spring on it to keep it from vibrating out.

One of these screws will have the letter "L" and one will have the letter "H"

which simply means "L"ow idle and "H"igh idle.

Crank the saw and without hitting the throttle (if it will stay running) adjust the "L" screw until desired idle is reached.

Now if you ever need to adjust the High end Idle you can just crank the saw and then with the throttle trigger on full throttle adjust the "H" screw to desired high end.

Note that your carburetor is clean though and good clean fuel is getting to it because a saw that has been stored or just not run in a while or some trash in the carburetor can give you nightmares when trying to adjust the settings and it still wont be running efficiently.

My rule of thumb is: If it has ran good in the past then it probably doesnt need adjusting now. Look for another reason such as Bad/dirty fuel Dirty/trash in the carburetor, fuel line/filter problems etc.

If the carb is dirty and you adjust it to run, then you are just choking it down so it will suck more fuel (because it wasnt getting enough fuel to run) having to compensate for poor air fuel ratio and then you are not getting enough air. The mixture has to be correct for the engine to run efficiently.