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Stihl 039 online manual suggests the carburettor setting as ''The high speed (H) counter-clockwise up to the stop, i.e 3/4 turn from max. lean setting'' And the ''Low speed (L) clockwise up to the stop - then back off the screw one quarter of a turn'' My manual that I got with the stihl suggest otherwise. Having both all the way in then one full turn... It has me puzzled. Thanks.

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I would go with your manual settings the one on line does not sound right.

Posted on Mar 19, 2011

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How do i set the idle on a stihl ms201tc chainsaw? you can no longer adjust the carburetor on these saws but im not able to figure out how to set the idle.


Look for the screw by the mechanism that moves when you press the trigger to adjust speed. Clockwise speeds things up and counter clockwise does guess what?

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Sorry i have a stihl 38 cuts out when i pull the trigger,the carburettor is still factory set . if i have to adjust the carburettor,.how best do i do this ?


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The Stihl 420 is starting but it's not picking up full revolution ,what could be the problem Thanks Frans


Engine is suffocating, like putting a close pin on your nose and then try to run around the block.
1) remove spark arrestor screen (located on the outlet of the muffler) and clean
*if the screen is plugged, the engine cannot breath: no air out, no air can come in!
If the screen is OK, then try this:
2) with the engine running at idle
a) turn idle mixture screw (L) out (counter clockwise) 1/4 turn
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Turn the High speed screw (H) 1/4 turn
3) The BR420 from the factory was set very 'lean' to meet EPA standards, however, they suffered poor performance because there was not enough fuel to the engine.
4) *** DO NOT turn the screws clockwise from their original settings, you WILL score the cylinder.
When shutting down, allow the engine to cool down for at least 30 seconds before stopping.

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What is the high altitude adjustment required by the manual?


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My saw was working fine then it turned off and i tryed to ajust it and i think i made made things worst how do i ajust it to the factory setting the H and the L and LA it a stihl 039


Make sure your saw is about half full of fuel. It makes a difference on the adjustment. Start your saw and let it warm up to operating temperature. Then turn the saw off for a minute. So you can do the initial adjustments,

first using either a small screwdriver or hex screwdriver ...depends on what the 039 has.

Turn both the Low speed (L) and High speed (H) clockwise until they stop. The turn them both one full turn counterclockwise.

Then with the screwdriver turn the H screw slowly clockwise. You will notice it will start to run faster as you turn it. Adjust the screw until the saw is running smooth and fast until it starts to 'flutter" . Then turn it slightly back . This will get the proper RPM.
If it is running too fast,or too slow, turn the Idle Adjustment screw (IA)( it is an i not an L) counterclockwise to lower the idle or clockwise to higher the idle.

Put the brake on and let it idle. Then turn the saw different times to each side and up and down. If it turns off or sputters, turn the L screw slowly back a little to adjust it and that should give you the proper adjustment. Now , if there is nothing else wrong (like a vacum leak) your saw should run fine.
If you absolutely can't adjust it. Something else is wrong it is sucking air through somewhere. Take it to the shop. or if you can, DIY, then by all means do it.

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I have a slow-starting f555rc stihl weedeater. Is there a manual online for making gas feed adjustments?


There are probably limiters on the adjustments.(epa). If not 1 turn out on low speed 1and a quarter on high speed. Never adjust for max rpms this will lean it out.(could burn it up).

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2 Answers

Tunning specification for a stihl 028 chainsaw?


I'm not sure there are any "endorsed" tuning specs from Stihl as weather, temperature, fuel quality etc all contribute to engine performance.
Pictures of all types are all over the web.

As for the carb tuning procedure, maybe I can help?

Start with fresh fuel, all filters clean, and bar and chain installed. Also, fill the chain oil tank with bar/chain oil and VERIFY that the chain oiler works properly.
Initial fuel mixture settings (the H and L screws) should be 1.5 - 2 complete revolutions counter clockwise from lightly seated. Sight the carb's throttle plate and adjust idle screw counter clockwise until the plate stops moving.(Throttle closed completely.) Then go back clockwise 3 complete revolutions. This will produce an acceptable startup condition on a HEALTHY saw.
Clamp the bar in a STURDY bench vise and roll the chain with the shank of a screwdriver to verify it is clear. BE SAFE!
Choke the saw and pull the starter rope until the engine "burps".
NOTE: If no burp after 6 pulls, stop! Something is wrong.
After the burp, set choke to half and pull starter until it runs. The settings I gave should produce a slightly rich condition and a slightly high idle. (Chain will be in motion!)

Blip the throttle trigger and idle it down just enough to keep it running during the tune procedure.
Step 1) Using the "L" screw (closest to the engine), turn it clockwise until the engine smooths out or possibly increases RPM. Back it out slightly until the engine has a slight "LOPE" sound to it. (Like a drag car on nitro).
Step 2) Accelerate the engine to full throttle and go to the "H" screw (closest to the air filter) and slowly turn it clockwise and note the RPM increase. There will come a point when the saw will "Top-Out" and loose power. Not even enough power to turn an maintain empty chain's RPM! Go back counter clockwise to the edge of that point, and counter clockwise another fourth (1/4) revolution.
Step 3) Idle the saw back down. Again go to the "L" screw and repeat Step 1.
Step 4) Repeat Step 2.
Step 5) Idle the saw down until the chain stops moving completely. NOTE: Don't settle for a "crawling chain" condition. If the steps above are performed well and all else is healthy, you should be able to idle the engine down to a ridiculously low RPM and it will not shut off.

Hope this helps,
Dolf-

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1 Answer

The second hand McCulloch 120 chainsaw I purchased


I think the pre-adjust settings are to turn jets in all the way and back out 1.5 turns each. then:

You will find a Low and High adjustment screw. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn.

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