Revealing The Truth About Carburetor Adjustments. When NOT To Do Them And WHY!
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- Опубліковано 30 вер 2024
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My name is Bre. I took two years of small engine repair at the local college. When I left school, I fell into a wonderful job at a local small engine shop where I worked the counter for a couple years. In 2010 my husband and I opened up our own small engine shop in central Arkansas where I am able to work alongside my family and best friends. We see over 2,000 pieces of small engine equipment every year, and answer 1,000's of small engine questions. We specialize in brands such as Briggs and Stratton, Kohler, Echo and Shindaiwa, but work everyday on MANY other brands like Stihl, Husqvarna, Honda, Craftsman, Remington, Red Max, Troy Bilt, Scag, Bad Boy, Hustler, World Lawn, Poulan, Mantis, Etc.. Hopefully, my experience I share, will save you Time, Money and Frustration in the future!
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I'm an old fart and survived the world of British sports cars in the '60s and '70s.
I read a tongue-in-cheek book in those days called "How To Fix Your British Sports Car" ("If Britannia rules the waves, why won't her cars go through a puddle?"), and one of the chapters was titled, "Carburetor Is A French Word Meaning Leave It Alone!".
SU Carbs SUC!
Gotta love LBCs though. I’m redoing a 66 chrome bumper B right now.
Friend bought a MG and he calls me to set his Carbs ,, you got a Copy ? lol BEERS!!
Lucas electricals always fun. I once read a comment that the Brits were more interested in gluing wood to the dashboard than making an ignition system that would work reliably.
@@arthicks2566
Why would you need working inhibition when there's glorious wood on the dash?
Working inhibition? Ignition. But, I see your point. You can always sit in the car and wax the dashboard. @@tin2001
Yep, adjust a carb on a problematic machine and now you have two problems to deal with and a much tougher repair. Love your troubleshooting methodology focusing on finding root cause.
I’d say the first step is to know what you’re doing, second step, if you don’t know what you’re doing, take it to Chicanic! She will know what she’s doing…….
I really appreciate your take on this subject. A small engine not starting after checking a few simple things like expired fuel, clean air filter , spark etc., and then immediately turning to "my carb needs adjustment" does seem out-of-whack. Case in point my older Stihl 029 Super would fire but then almost immediately stall. I did order a "tune up" kit as I wanted to make sure the fuel filter wasn't the source of the problem. However, when I thoroughly dug into the issue, turns out the fuel line had a split in it that was not visible until I removed the fuel line. With that split, sucking in air and quickly going lean then stalling was actually what was occurring. Would have been so easy to just point to carb tuning but obviously it was something else, exactly your point of this video 👍
Yep... That will do it . Like you say it's not always the carb.. would you recommend changing all the springs ? Instead of changing the clutch?
When your time is worth more than the parts, you replace the parts in the quickest way possible... especially if you're going to have to provide warranty on the job.
Chain spinning at idle usually only has 2 causes: "LA" screw (idle speed) or clutch and I think the clutch is the easier one to check first. Good stuff as usual. Thanks
You're right about the clutch being easier to check, so I would recommend doing that first, but when it comes to the idle screw, I would have to disagree since there could be a huge list of things wrong that could affect the idle RPM of a saw which in turn could make the chain spin at idle even if the clutch is ok.
If you had an air leak it could raise the idle RPM.
If you had fuel problems it could raise the idle RPM.
If someone leaned out the low screw too much it would increase the RPM.
Needle bearing failure will also cause the chain to spin at idle.
@@RobertNES816 True, but that's basically right next to the clutch so you would notice that if you inspected the clutch. Hence why a broken needle bearing effects the functioning of the clutch to begin with.
As a fellow mechanic for over 35 years,I really enjoy your methodical approach to diagnosing and finding the root cause of problems.I find it extremely satisfying.I have found a kindred soul at last ! Keep up the great work.
Back in the 70s right out of high school I had a pincor lawn mower. I loaned it to my neighbor, he dinked around with the carburetor without asking me first, and it never ran right again. I think he damaged one of the needles.
The most sound, sane advise to be had from UA-cam (when it comes to small engine repair at least ;) Great Video!
Thank you for taking the time to shoot and edit these awesome videos.
You are fantastic! thanks for providing us shade tree mechanics with such good information.
Thanks, that was very helpful.
Just discovered your channel and I love it. It's funny how hearing about machines I've never owned is broadening my understanding of the two cycle world. I think that's attributable to your experience and how you talk about the problem at hand. Thanks for growing us!
😊
Treat the cause, not the symptoms.
My assumption would have been to check the clutch, after all, it's not supposed to slowly spin.
I agree! I only had to adjust my Carb when I moved from sea level to 6000 feet altitude. At first I thought it was the fuel, but no. Half a turn or so and she idled and ran just great.
Great video but WTH happened to the missing spring how the heck did that come off and where did it go ?
You answered your first question wrong. The saw was running perfectly. Idled nice at low rpm, no bog when you hit the throttle... Carb (and all the other stuff you went through) should have been last thing to check. It was obvious off the bat that something was wrong with the clutch. Now had the idle been too high I may have checked for air leaks before adjusting the idle.
Removing the side-cover would have been the first thing I would have done! My money would have been on the clutch first.
Great video! I love how you showed all the steps you took to fix the saw!👊
if the chain is still spinning at idle, then the fact it is at idle should be a clue that it isn't the carb that's the problem. you'd think he'd have noticed it was hard to rotate the chain to sharpen it.
In have had plenty that would idle and the chain spin. Then pull out the three Smart Tach TA500 and find it's idling to high, dial it back a hair to the recommended RPM's and the chain stops. Just because it idles doesn't mean it is idling at the right RPM's. A slight increase in RPM's will engage the clutch and cause the chain to spin. But you're right that a commercial client would have to sharpen his chain frequently and should have noticed the difficulty turning the chain while trying to sharpen it, or would have seen the missing spring when he pulled the cover to take off the chain to sharpen it or replace it. Any way you look at it is surprising a commercial client didn't figure this out himself. And she is very right in needing to thoroughly go over the machine before ever just adjusting the carb. I rebuilt a saw and gave it to my brother who for a year and as half used a Poulan wild thing like it was a commercial grade forestry saw. Then pulled it out at the end of Florida summer to start more land clearing yet again and it didn't start to easily due to the humidity at the time. So he proceeds in adjusting the carb. He gets is firing off easily and starts cutting down little trees. He notices it's running hotter than normal and burns through that tank of fuel and fills her up. He burns through 3 more tanks the whole time he is noticing how hot it is getting. Finally on tank #5 he fills it up and it will not start. Our mom picks it up on her way though at the end of a trip and I get it and tear it down. He had aluminum transfer from the piston onto the cylinder walls. The rings where fused to the piston but broke in multiple places. When I turned the lights off in the shop and put a flashlight in the cylinder it looked like a disco ball from all the pin holes. I have no idea how that thing ran that hot and went through that many tanks of fuel with all those pin holes and the busted rings fused to the piston. It obviously had no compression. He has sent back a message with our mom that said the next time I want to give him a saw how about giving him one that works, and that can be worked like a Stihl or a Husqvarna. Pissed off I replaced the engine with another Wild thing motor I had in the shop. Made sure it ran and painted it orange with the krylon paint the plastic. Then I stenciled Husqvarna on the side. But I made it the caution orange so everyone even remotely close notices his "Husqvarna" saw. They I took pictures of the damage he had done to the saw and made a copy of the paperwork where I rebuilt that engine the first time and transferred it to him free of charge and explained to him that if he isn't going to run the saw properly and isn't going to have it cared for properly by someone who was qualified or as least experienced then he needed to just pay someone to do the work. And that there was no way in hell I would ever give him a higher end saw considering he obviously either didn't know or didn't care to treat that one like it was a tool he respected and if there was an carma in this world he would wind up cutting his leg off for the way he treated that saw. So he needed to be extra careful. Then I reminded him he was given that saw and didn't pay a dime and that it lasted a year and a half when him running it and it only had the standard warranty I offset anyone which is 6 months. I mean they are buying a used saw that has been completely rebuilt with all new parts and they run like new and they have 6 months to use it and if anything happens that isn't just blatant misuse like his was then I repair the saw at my own expense. And the saw and warranty generally don't cost them more than $100. So if that saw makes it through the 6 month warranty they have more then gotten their moneys worth. And I have never had a saw come back. None except his, 18 months later after being extremely misused and abused. So after chewing him out for being an idiot and ungrateful I explained to him that the only reason I did anything at all was as a favor to our mother. And told him that I decided he needed a better saw that could handle how he ran it. And told him I sent him a special edition Husqvarna that I had gotten into the shop that the customer never came back for after I did the repair. I told him it looks a little different than the regular ones but it should be fine. Mom said he was well past livid when he opened the case and found a Poulan wild thing spray painted caution orange with Husqvarna stenciled on it. I think it served him exactly right. There was a note in with the saw that told him that I would not be warranting that saw and he was in his own when he tore it up because he thought he had a brother that would just fix it or give him another one that wasn't up to the challenge of working as hard as he did. To this day he can't understand why your can't run a $200 homeowner saw meant for cutting up a few limbs here and there the same way you can run a $1000 Stihl that's meant to be in the woods all day. To him a saw is a saw and he has no respect for any of them. And as I learned he has no respect for the person that gave it to him either. So that was the end of making sure he was taken care of in that end. His one off Husqvarna is still running. But he gets some odd looks and even odder comments.
Nice Story, but you are right doing so
@@MikePate1975 If it's 'idling' too fast, it's not idling.
@@MikePate1975How rude to write a book in the comments section. No one cares about your stories. STFU! Be more considerate of Chicanics channel and listen to her and you might learn something.
@@OneWildTurkey why is there a screw called idle adjustment?
I'm pretty sure most people would consider the idle of an engine the slowest speed it will run out without operating the throttle, that same style of clutch is used on scooters and mopeds where it is common to change the springs for the clutch meaning you could have a higher idle and still no movement is it idling then? What about cars with electronic fuel injection if the ECU is commanding an idle stated specifically in the computer as an idle that's out of spec is it still idling even though it's at idle speed according to the computer is the computer wrong or the engineers who designed it? I'm simply stating I don't agree with your conclusion per se
Hi Bre I have had this problem with the chain continuing to spin on idle small engine shop adjustred the carb it did slow it but not totally. I will check some of the other things you suggest. Your video on strimmer line being put into water, is there a limit to the lenght of time to leave it submerged? Great videos keep them coming. Andy for Scotland.
It will eventually absorb as much as it's going to and stop absorbing any more. It won't damage it.
@@tin2001 Excellent thanks for letting me know
A blonde moment forgetting to put the plug in .....
Fix the problem, not the symptom. Great diagnostic work!
Chikanic I thought it was a block vacumm , man 👍
I have a question, I have a 20 year old Mac eager beaver saw. I use it 3-4 times a year. I use ethanol free fuel and run it dry when done. I store it in my basement and would the diaphragm develop issues the way I store it? It runs perfectly.
It will not. I've been using this exact method for over 35 years.
I new right after I started watching the video the clutch spring was broken . I restored several chainsaw with a broken clutch spring and I have had several clutch springs break on my two FS 130 Stihl string trimmers that are my trimmers I use all the time . They usually break on shut down I guess because the next time I fire them up head won't stop turning on idle but I usually just deal with it till I finish trimming and repair the clutch after I done. In case you haven't heard Novice Lumberjack was speaking highly of you on his Tube channel .
Follow the routine approach to fixing for you know it works. Nice recovery of the lost spark plug that was suppose to be a factory install. Great video and a pretty easy ECHO fix
Just curious. Why did you check to make sure it didn't have canned fuel in it?
Watch her videos on canned gas. Usw ethanol free gas and quality oil
More good stuff *FOR US* Thanks!!!
I recently purchased a new Husqvarna 435 but the "L" screw on the carb needs adjustment. I purchased the required 4mm splined tool
online but when I insert it over the screw it feels loose and when turned it feels like it's not engaged with the screw. I also tried one that
I already had with the same result. However, the same tool fits perfectly on a Husqvarna 120 and that screw "looks" to be the same as the
ones on the 435. Would you know if Husqvarna has change the screw size on the 435? Any advise would be appreciated. Thanks.
I wish this world had more good women like her in it,, it sure would be a lot better place that's for sure.
very informative. Thank you
Great video things aren't alway what they appear to be a lot of times.
I thought the idle sounded fine. I would have gone straight to the clutch on this one.
Learn something every time 👍👍
That's for letting me to what to look for first
I need your help or advice. I am thinking of getting a Scag commercial mower with 38 hp Kawasaki or 40 hp Briggs Vanguard? Help please....
NAILED IT !!! theres a reason for everything. wiyhout knowing you're just a hamster on a wheel.
Starting a SCREAMING chain saw in my way of thinking is NOT a good way to begin your video. So, I shall just UNSUBSCRIBE!
I HAD a Husqvarna that was falling on it face under load. Checked everything as you suggested, ran the carb through the ultrasonic bath, put it back together, same problem. Took it to the shop, they adjusted the carb and got it running. Took it home, same problem, so I decided to just adjust it some more. Used a tach and THOUGHT I made sure I had the mix rich enough. Ran great for a few hours... It now has a scored cylinder about about 45 psi of compression. I HATE 2 cycles. Anyone out there have any experience with aftermarket piston and cylinders for Husqvarna? $1200+ to replace it.
Adjust the carb...lol...I have had chainsaws, weed whippers, push mowers..dozens..and I have never adjusted a carb. My dad? He always goes to the carb.. he has an issue with a piece of equipment, he says, so, I took the carb off... his first go to is the carb...I always chuckle. On a couple pieces of his equipment, I just ended up replacing the carb...and THEN fixed the actual problem...now, if I could just get him to go E-free... he considered using the engineered stuff at the big box store.....🤦
So many times the carburetor is the problem so that's the first thing I think and so many times I waste time cleaning , adjusting, replacing ect. just to find out it's not the problem ! Thanks for a lesson I wish someone would have pointed out many moons ago...I will remember your words , TY !
The clutch was the first thing that came into my head. I must be a better mechanic than I thought.
I thought clutch too. And I'm just a computer janitor...
No joke, I'm coming here to look at a Stihl FS91R. Its just bogging continuously, never revs up. New carb plug filters (fuel and Air) and I don't know what the next steps would be.
Thank you. High Idle issue on a CS400 and will not be messing with ow or high screws just yet.
not being a know-it-all (unless you ask my wife...lol) but in my pea brain my first thought went to the clutch...probably because I'm lazy and it's easy to check...lol.
I had someone explain the whole KISS thing...I had to ask him how he knew my name...lol.
Seriously though it is great how you explain your process so even an old fart like me can understand.
Cheers from New Beunswick, Canada...eh.
if the chain is spinning a idle, then it's either idling too fast (and clutch is engaging) or the clutch is engaging at too low a speed. You could hear after the first pull that idle speed was acceptable... it had to be the clutch!
Must tell you I really love your videos. You are so informative and full of useful tidbits. I would love it if there were a person like you here in Colorado where I live. The small engine folks are good and know the stuff they have to, but they do not have the same personality like you. Keep it up. Have you ever made a video talking about how you got your experience and what made you choose to do this for a living? Thank you.
I have this problem with the springs breaking a lot with husqvarna concrete saws, the 1250-1260 problem with that machine;s you can't get it started
Awesome have found this on Sthil demosaws and dry clutch bearings on chainsaws Husky & Sthil
vacuum/exhaust leak, or crank seal. just buy a new saws ready at the owner(tree service by the looks of saw). have them repaired and rotate back into stock.
""hurry, hurry, I need blah repaired yesterday so I can use it right now!!"" think a bit further ahead, especially if it's one of your primary tools for the trade, or quit crying and use sawzall/bowsaw by hand :))
😂😂😂😂. I could’ve told u that day one😂😂😂. As a pro wood cutter. I/We see this a lot on saws. We use stihl mostly. A few Holzfarma too.
A trick I found that keeps you from damaging the rewind without having to remove it. Just pull the rewind rope out a foot or so and lightly clamp the rope with a cheap spring loaded plastic clamp. when you turn the motor backwards the rope will slide easily through the plastic clamp. No rope or rewind damage done. I figured this out on saws where removing the rewind housing is a pain.
I really like your channel and you have a very good way of presenting your ideas.
If you can't learn from watching your videos, you can't learn. If nothing else, you can learn to take it to a pro.
Stupid Stihl took all adjustment in their M Tronic saws. Only thing you can do is a tooless 90 second recalibration. Dang saw just keeps cutting and cutting. Where’s the fun in that?
I did most of those things to get my Stihl HS81r to not bog and assumed it was the carb. Replaced carb, no difference. Turned out to be clogged spark arrestor. Cleaned it. Runs like new. Carb was only $16 so not a big deal.
I like your honesty. And I wish you were closer to me . To look at an old chainsaw I have.
I guess I will try and find your phone number.
Unless someone can post your business number. Thanks for the
Great info… 😎🇺🇸
I have to ask your humble opinion on E-spark plugs for lawn equipment. They sale them for anything from automobiles to lawn mowers. Do you think they are efficient for lawn equipment?
I have had to change the belt on my John Deere 48" deck twice this summer. I can't see anything wrong with any of the pulleys.
The belts were completely destroyed. Do you have any suggestions?
I know as a professional you cannot do it because it might come back. But I would have just put another Spring on that clutch What's I'm sure you have a junkyard full of them. But you put new on then if it breaks it's the manufacturer's fault👍😉
Great vid and tips as always, thanks! 👍👍
Why anyone would run a two stroke as lean as the EPA wants them to run is strange to me.
A tad more high quality oil more 💨.
And a touch of a cough and never run it hard especially when it’s super hot out.
Stuff will last forever lol.
You must always tune your machine to the proper AFR for a given fuel oil mix.
If you don’t know how to do it right don’t it will not end well.
I have never had a 2 stroke that didn’t need some adjustment from the factory.
I prefer older stuff because the chains get oil And they have wonderful things like push button chain oilers lol
Dirty gummed up Clutch drum, weak clutch spring or worn out need bearing If the saw running and idling Properly. Don't forget just a small amount of Bearing grease for the needle bearing.
A question for you. I have a very old tiller, Iron Horse I think made by Kohler, and when I put gas in the tank and open the jets on the carb, the carb starts filling with gas. Filling to where it's spilling out of the carb, not the bowl, but the opening where the air filter goes. Any advice?
Hello dis grand day.
Pull the rope out 4/5 “ when putting piston stop in. And it won’t Hirt the dogs. Also if you use impact drive you may not need piston stop. But pull on the stater rope while impacting clutch to remove.
Just saying.
I would like to know what happened to the clutch spring. Oh,by the way, I love your instructional videos. Thank you.
You kept saying “it wont idle”…. From my view it seemed like it was idling fine but the chain kept spinning….. the clutch is the first place to look. Same for string trimmers too.
Such great insight. Thanks Bre!
Thanks for the video Bre nicely done ❤❤👍. Take care of yourself and family and be Blessed ❤️❤️.
After hearing a zillion saws idling, if the chain is still moving with a proper idle, it's not RPM related.
These saws are set to run well from factory with everything in proper order. The carb 95% of the time doesn't need to change, it's some other condition that has affected the engine, making that carb setting no longer optimal.
I agree and I disagree. For the homeowner, infrequent user, fuel/carb issues have to be the #1 issue. For commercial users, what you say seems correct. They just abuse stuff till it breaks.
Here a though, everything in life is in a circle or cycle, from a molecule to planets to crying to laughing cold fever become hot fever. Even a carburetor tuning good ,bettor, best, worst back to better, LOL
Excellent videos on your channel. I'm just outside Little Rock, are you close to Little Rock?
Hi Bre, since you have a shop you wouldn't happen to have a carburetor for a FS 36 Stihl would you, it is an older trimmer, and do you have a video where you are changing the fuel filter and pull rope or cord on a Stihl FS 56
That’s weird I never would’ve thought of carburetor. If it was running well, my first thought was there might be a bearing in there starting to stick come out like a needle bearing on the clutch bell. 😂 I guess I better keep watching. Lol
only time i tune on my chainsaw is when it goes from summer/fall to winter... and then i retune again in the spring... Cold air is much denser than warm air... a saw that is properly tuned for say 80 degrees, will be extremely lean in cold weather... if you change elevations drastically... say 1000ft from where the saw was tuned, that will also effect your tune
That’s a strange thing, guess it walked off by itself
Springs do that, Right???😊
Locked up clutch bearing, bad clutch spring, should almost be obvious. But.. some days, maybe not.
Curious if repairing that clutch could have been saved by just replacing the missing spring?
Checking the clutch would have been the first thing I checked. I have replaced to many clutch springs for me not to check it first. It could be the carb but not always.
Comment.....What I can't believe is that someone who has to have their saw so urgently (Who sounds like they are running a business) does not now how to inspect their own saw and would not notice a spring missing...... that person needs to find other work.
The saw was idling down nicely yet the chain kept moving, yep its the clutch. got the plug out but want to lock the engine to remove the clutch, just feed in starter cord in the plug opening and bring the piston up, string fills the cylinder and locks the engine, replace the clutch, remove the starter cord, replace the plug, done.
You are absolutely incredible! I learned about 82 things from this video. Thank you for what you do
Did I miss it? What happened to the missing spring? Would.have thought there would be pieces somewhere.
I'm not a chainsaw mechanic, clutch would've been my first guess
Good thing to know thank you😎😎😎🇺🇸🇺🇸🇺🇸😎😎😎🇱🇷
Hey lady,
Can you do a video on the new battery powered trimmers? Your thoughts and opinions would be helpful for us homeowners out here in the wild. 😂
Fuking awesome
How about engaging the break? Wouldn't that have just stopped the engine?
This is a great example of a needed suggestion I have made in the past. She does a great diagnosis and repair of a specific model of chain saw, but that model is not mentioned in the description, and therefore not searchable. All the people with an Echo 355 chain saw who search for a repair of that model will not come across this great video. Please tag your videos with the brand/model of machines you fix so that people searching for help with their machines will find this help.
So this is an end to your channel this is an end to everything but I think you've covered just about everything I'm going to miss those Daisy dukes and those flip-flops
Maybe just a bow saw or some other hand tool would work better. Just kidding. Keep up the good work just keep it real
You said a mouthful when you said “I want to know why it needs a carburetor adjustment”. Great video.
Had one running like poo and no adjustment of carb would help. Ended up being leaking crank seal.
Love you for the love you for the thank you very much yeah I know what to look for I cannot figure out why but now I did thank you for your help I love you so much for that but the reason why I was going to smash it with a I was going to use a sledgehammer
9 times out of 10 it’s something OTHER than the carb. The chances of the carb needing an adjustment after factory tuning is pretty lean....😂....ok come on that was pretty cute what I did right there.😬
I had same prob on mine, I just put a new spring on it. For few bucks I got 3 new springs.
What is the model number of the tach? Manufacturer? Thankss