High and Low Carburetor Adjustment on a Stihl Trimmer
ฝัง
- เผยแพร่เมื่อ 15 ก.ค. 2024
- The carburetors on trimmers, blowers, weedeaters, and other small engine equipment, have several adjustments screws. If your equiment won't stay running or isn't running correctly, you may be able to adjust these screws to get it to run better. The high adjustment screw should be adjusted at full throttle. The low adjustment screw should be adjusted at idle. The idle adjustment screw should be adjusted at idle and is basically just adding or releasing tension to the throttle cable. If your equipment dies when you release the trigger, try adjusting the idle adjustment screw first, so that it adds tension to the throttle cable. If this adjustment doesn't work, it's possible you need to adjust the low adjustment screw. If your equipment lacks power and the rpm's sound too low or if it sounds like the rpm's are revving too high, you may need to adjust the high screw. This video shows how to make those adjustments on a Stihl FS-90 trimmer.
![[LIVE] : ONE ลุมพินี 70 | คู่เอก "โฟกัส vs สเตฟาน"](http://i.ytimg.com/vi/_fVieQ89DRQ/mqdefault.jpg)
![fellow fellow - Proud [OFFICIAL MV]](http://i.ytimg.com/vi/9uZF7BlUQPE/mqdefault.jpg)
Glad to see some one explaining how to adjust the carburetor without confusion. Thanks!
Succinct and to the point, THANK YOU! So many people drone on and on and on about stupid crap unrelated to the video. THANKS for NOT doing that. GREAT VIDEO!!
Perfect explanation and demonstration of how to get these adjustments done.
VERY HELPFUL: simple, to the point, covered all adjustment points. Thank you
Finally an explanation that was easy-to-follow and he had my attention 😊
Thanks for taking the time to explain in detail. You would be surprised how many dummies there are trying to teach!
Everyone on UTube is an expert.
Thankyou Mike, Great explanation, adjustments made to the high speed, much better. Have a great Xmas and new year. Best Wishes from Tim in Australia
mike, you're the shit. this video is A1, and the cookie cutter cuts and graphics somehow make it even easier to follow. i loved it this is exactly what u need to watch if you want to understand how 2stroke power tool carb adjustment screws work on any powertool. fuck yeah
You helped me a lot on this . I have a 133 and it would start and die . I adjusted the idle and problem solved . Thanks
Addressed all of the things that were giving me problems. Well done sir
Most helpful straight forward video. Skip the others. Thank you.
Great video! All my questions were answered. I'm sad he isn't active anymore...😢 Come back and teach us more!
I adjusted my fs 90 with no problems after watching this video. Thank you. I noticed I had a missing nut holding on my carb which I replaced and that was probably half my problem with it not running right. I was able to set the high speed adjustment so it spins like it should at full throttle and I was able to adjust the idle so the head doesn’t turn anymore when it is idling. I was just about ready to buy a new weedeater. Thank you
Awesome! Video helped me too!
Great video, simple and informative, I learnt a lot...thanks very much.
Exactly what I was looking for, thanks
followed your instructions, now works like a charm!!! thank you so much!
Thank you for this explanation. Very useful and complete.
bro, you the man. this really helped saved a ton of time and effort figuring this out. thanks
Perfect info, very concise. Thank you.
Your video is by far the best, Mike!
Great video, thank you so much. This changed my effectiveness and pure understanding of what I'm doing with power equipment. 🔥🔥🔥🔥🔥
Mike, this is a great video bro....your demonstrating with sound and explanation all lends tremendously to the heightemed effectiveness of what you're communicating here. Great job, man.
Brilliant nice easy to follow guide! what a winner
Clear, simple explanation, thanks
Ok Mike thanks for the quick reply I will have a look
My 85 head was spinning fast when I start I will lower it give thanks for your assistance 💯
Thanks man had my uncles fs160 sitting for while and tuned it!!
Greatest video for adjusting a carb
Thank you for going strait to the point,
even tho I have the old 480 series (same carbi) this was just what I needed to retune it after its tare done and clean
I subbed, thanks for sharing, awesome video!
Very well explained. Thank you
Amazing! Thanks very much!
Yea nice job. A+ for not saying "whatsup guys don't forget to hit that like button and and subscribe." Also an extra plus for not trying to make comedic bits on equipment videos. Subbed.
I have to check I have the big 4 (stroke or whatever) Stihl whackers that die intermittently. Will work for half a day perfectly, and then die out, or it will die out at the last 100 foot section of an acre property. 2 stroke trimmer with problems of super high pitch while full throttle. Not good. Hopefully this is the fix after no restults from spark arrest and air filters and carb cleaner.
PS sooo many ads on youtube now it's ridiculous.
You solved my problem sir😊 thank you.
Great video!
best explanation i see so far thanks mate
Nice job!
Thanks for your help Mike! 🙂 Remember that God loves YOU! 🙂
Thanks again for your help Mike 🙂
Thanks it-helped with what I needed
Grasias muy buen video 👍🏽
Thanks bro big help.. Thank you bro 🙏
Great video thanks
Thank you, very good video.
Brill ,well explained
Very clear Thanks a lot
Thank you so much!
Very good video
The high and low screws are actually to lean or enrich the fuel mixture, not rpms
incorrect. one is for idle the other for wot 👍
You adjust the mixture, which in return changes torque and rpm. Not a pro, but ya.
Best video ever 🎉
THANK YOU!
Cool! Thank's dude!
This was helpful
The way you showed how the T screw simply pushes the idle resting stop to hold the throttle butterfly more open is gold. Along that same line, am I correct to say that clockwise rotation of both the L and H screws reduce fuel delivery through their respective passages? I can see how you want to run a little on the rich side, to avoid a lean seize situation. When running a little rich, increasing fuel even more will slow rpm.
What I was looking for
Perfect! TY!
Thank you!
Great video! I found it because I didn't know what the H and L adjustment pins on my trimmer are. Mine look like pins, not screws, so are those just the caps and the actual screws are underneath? The other issue that brought me here is that the engine is leaking at or near the muffler. I can't tell exactly where but it seems to be spurting out in that area because it splatters on the inside of the housing in the area of the muffler/spark arrester. Not only spurting out, but also enough to where it's dripping. The make/model is Stihl KM56 RC. I'm not sure if it's worth disassembling to look for any glaring damage/breakages to fix that or replace the carburetor. I don't see you responded much to comments, but I'm hoping you could hook me up with a little input from your skill and knowledge base. I really don't want to buy something new if I can fix this and I would always prefer learning how something works so I can fix it, rather than trashing it, and 2-cycle (or any for that matter) engines are definitely a knowledge gap for me. Thanks for your time! 💯
Thanks!
Great video. Best! Seems like the idle and low speed need to be adjusted in parallel. My edger blade spins when idling. Not super fast fast enough to be dangerous. Is that a low adjustment or idle adjustment or both? Thanks!
Mine idles perfect and runs at top end perfect, but what would cause it to bog when I squeeze full throttle? It’s brand new, just bogs going from low rpm to high
Thanks bro
The screws affect the mixture or the volume? Always thought the mixture screws add more or less gas at a idle or WOT path? Not just rpm going up or down. First setup would be High screw and Low screw at 1.5 turns off the seat?
What size adjustment screw is this and what’s it called? Where can I get one? Thanks
Generic adjustment is usually 2 turns out from stop on the low side adjustment screw. Readjust when the brush cutter warms up. i.e. if the adjustment is lost for any reason, lightly screw the low end adjustment screw all the way in till its stops then screw it out 2 turns. This is an about or approximate adjustment.
Is the adjustment of the LA screw affects the L(idle speed) and H(power) of the engine?, i have a stihl fs120 trimmer and no matter i try to adjust it by following your tutorial it's still not working, any other sugestion?tnx!
What is the size of that spanner?
U da man
I have same and I trun that alway up and wen I used they seems like lose power so I might Ned to adjust that
Hi, Great video, but could I just ask what size screwdriver socket you are using for adjustment? Thanks
4mm hex head. They sell them on Amazon, as well as kits with several others. Just search “stihl carburetor adjustment tool”
Just for my education, when you are turning the screw out , (e.g turning slow speed CCW) how is the air fuel being affected ? More fuel? More air? I.e are you making it more rich or lean ? TY!
If the high screw is open only half circle , will the engine burn?
Forgive my english
I adjust all three and still won't idle. Cuts off as soon as I let off the gas trigger. New plug just installed. Any ideas?
Hi please I need you help the engine stop time ti time when am using it for work what can I do please I need enlightenment on this issue.Thanks from Italy
Thank you why does it take 6 videos to get this info!
Not a mention of rich/lean?
I’ve been working on a fs55rc and when running, the idle speed is through the roof, almost to where it could cut grass without even hitting the throttle. When turning down the idle and practically having the adjustment screws falling out of the weedeater, it still idles the same. Any ideas?
Did you ever figure this out? I’m fighting the exact same problem right now
No never, still looking for a fix
Starts. Runs. Dies after 10-20 secs idle. I'll try this first, then I'll assume my fuel filter may need replacing.
Thanks.
Would this being out cause the air-filter to get wet with fuel? Or, would it be the fuel-tank vent? 👍
Often caused by the vent, but could be carb.
I messed with the H and L screws before watching this videos. How do I get it to a base setting? I cannot get it to run now unless it’s on partial choke. Soon as I pull the throttle it dies
@@drewrushlow2401 no it’s turn close wise until both are seated(not tight) then back out 1&1/4 turn on high and low side. That will bring you back to baseline and you can adjust it from there.
@@6atlantis that's making the assumption he's running a stihl, they use a 1 1/4 set point but many do not. I have some that are 2 1/4 +or- and on some the 2 screws have separate settings.
Best thing to do if you don't know (and can't find out) is to let the machine set and be cooled. Start with both screws at 1 1/4 turn out. If the machine doesn't start within 2-3 pulls go up in 1/4 increments til it does start. Tune it up and then let it set a while to cool down and try to start again if it doesn't start within 2-3 pulls you need to retune or figure out what the problem is- bad filter, line, dirty carb, or a vacuum leak. 1st thing I always check is for the leak when a machine I tuned doesn't wanna run right after I tuned it.
@@latestplague3762 He is running a Stihl in this video, and 1&1/4 turns is baseline for 99% of 2 stroke trimmers.
@@6atlantis Excellent. I'll try this because I cant get my Stihl trimmer to even start let alone enjoy the luxury of tuning it!
@@terryhay2029 You may have figured it out by now.. I had this problem today and I cleaned the spark arrestor on the exhaust and my hedge trimmer started right up.
Just bought a new fs300 an it won't stay on idle
My wheel keeps spinning ( not in idle) please help
But this should help
What is the diameter of the carburetor adjustment screw?
28
4 mm hex for H & L
.
Small straight screw
driver for IDLE
Weird I only have 1 screw. ??
Still doesn't say where a good starting point is. As-in how many turns out for each screw for initial startup. Everybody knows what the screws are for...
Locating the “hi” screw, proceed to turn it counterclockwise exactly one turn and a half. You will need to turn the “Lo” screw one complete turn in the counterclockwise direction. Now locate the Weed Eater choke and pull the cable out to start up your engine. The engine, at first, may sound rough when attempting to run, but you need to keep it running. This can easily be worked by using the gas throttle. In order to make a proper carburetor adjustment, the Weed Eater engine needs to be warm.
Does anyone know what factory settings are for the high and low. I started turning like a dumbass before I watched this video and don’t know what to do now
I’m at the same point pal lol that’s why I’m here
No doubt, He says nothing in this vid. Factory settings are, turn both high and low in clockwise till it's seated, don't crank it in, just resting, then turn both out counterclockwise 3/4 out. With trigger pinned turn high in or out till you hear top revs, once there turn down just a bit. On low, don't touch trigger turn in or out till you get a low idle speed. then the screw on the bottom is your head spinning, turn either way just to where the head just stops spinning on idle. After a while you will have an ear for it. If you have plastic restrictor caps on the screws, they just pop off
I can get it to start and idle but then it dies. Then i can get it to go and when i apply a little throttle it dies even if i let off of it. I adjust now it works but when i fulll throttle it dies. Im in a never ending circle of problems once i solve one and i even bought the same tools why the fuck is this not working at all for me
How about high and low adjustments.?? Special tool? A 10 yr old could figure out the idle
i got absolutely nothing from this video,,, you never said anything about what i am listening/looking for ,, you told us turning the screws increases and decreases the speed,,, heck i already knew that !
Good for you! Obviously this video wasn’t meant for you if you already knew everything in it.
Talk louder please , otherwise great
Look up another vid then Gabe 😂 wtf
It would have been nice for the narrator to start at the beginning and state what position the knobs are in as if I am starting from scratch so I would know typically what position, clockwise a certain distance, or counterclockwise a certain distance to give a starting point.l
Hey I’m pretty sure everyone knows how to turn screws. Didn’t learn shit from this if I posted something this stupid I would be embarrassed
Cool story, all the positive comments must have come from the people not as intelligent as you are. I look forward to watching your tutorials to see how it’s done. 😂
OK...
If you turn this you increase RPM's
if you turn this you decrease RPM's
WHAT EXACTLY ARE YOU LOOKING FOR TO KNOW WHEN YOU ARE AT THE CORRECT RPM SPEED?
Yes, you can hear the RPM's go up and down but all that is meaningless unless we know what we are looking for.
The LA screw does nothing to the actual throttle cable. Turning the L or H screw in either direction will eventually decrease engine rpm. This is poorly worded and not accurate. Keep looking.
No it's not perfect at all. I need adjustment directions for an FS 96 NOT ANYTHING ELSE IT IS NOT THE SAME THIS VIDEO IS DAMN USELESS. AND ITS THE ONLY CRAP THAT KEEPS POPPING UP