Stihl Trimmer doesn't run at full speed.
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Thanks for watching. This Trimmer starts and runs but it's not getting to full speed. Luckily the fix was really easy, if you have a torch that is.
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Another quality video on a common problem. Systematic approach is well appreciated. Wish all lawn equipment was this clean when received 😄. Thanks again...
Glad you enjoyed it Mr G.
Same issue on my Stihl KM 56 yesterday. TH-camd and led me to your channel. Went over the same checklist and it turned out to be the exhaust screen, totally blocked. Didn’t even know there was screen there. About a minute both sides on my gas stove and viola, it did it. Thank you very much.
Glad I could help
Hey! there is my favorite brand lol, love the FS56R had the curved shaft as my first piece of stihl equipment, solid trimmer and runs so nice. Honestly id probobly just toss the screen if it gets clogged on my equipment just easier, although I havent had it happen on the equipment I use commercially. I had one stihl handheld blower have a screen get clogged up but it had a manual choke on it so I would quite often forget to unchoke it and it would run rich a bunch of the time.
Thanks for the info! I appreciate that Frame Lawn Care.
I.d use a propane torch for cleaning the spark arrestor screen etc.
Thank you Patrick Stapleton.
@@INSIDEHOUSEGARAGE my pleasure mate and stay safe etc.
I had one that looked like this like 5 years ago it was the FS56C with the bike handles definitely regret selling
well I'm sure whoever has it, appreciated you selling it. Thank you The lawn channel
Chuck the arrestor in the bin.... you won't start a fire unless you cover the thing in dry leaves.
you do you
This is the first thing i do to all my 2cycle stuff man.
If its tuned right you wont be sending sparks out the exhaust anyway 😮.
Let that thing breathe guys itll live longer too and have less internal heat in operation which also reduces the chance % of an ember coming out.
Ive worked on small engines off and on for around 25 years and have ONLY seen sparks when people have the tune way lean or dont use oil in the gas.
My fs38 does not have a spark arrestor to remove. So how do I clean it. Should I take the muffler off and throw it in the fire?
The outlet hole is threaded take it out and the screen is right there.
Thank you for that info.can you also make a video testing pressure and vaccum to check the seals and gaskets.thank you sr
I would but I need to get a tester first.
@@INSIDEHOUSEGARAGE harbor freight has the equipment at a reasonable price. I would like to see that test too. Good video!!
Thank you! I had no idea there was an exhaust screen. My weedeater is running properly now, thanks to you!
no problem
hi...what can i do if the screen is built in the mufflre?
drill holes in the muffler.
I would use my torch. Everything else doesn’t work as good but my stihl is practically 18 years old & yet have had that problem yet!
nice man!
I would use my torch and burn off the excess carbon
thank you Ramadin Sookhoo.
Had this problem just this morning and your video help me so much... Thanks a lot I will subscribe to your channel from now on!
Thanks for the sub!
I already have a propane torch which I have used to Clean them with before to get them running right.
I have seen someone on here use nothing but carburetor cleaner & a wire brush to clean them as well.
I wouldn't remove the spark arrestor screen particularly in my area in Australia particularly in very hot & dry weather where people have lost their homes due to a spark igniting a fire & burning the scrub off.
It's similar to the problem that California is having in the U.S. where there's constanty fires every summer & people lose their houses due to that !
yes that's always a concern when dealing with the screen. Thank you Russell Booth
I had replaced the air filter and spark plug on my Stihl FS56R and it was still sluggish. I found your video and afterward checked the exhaust screen. It was blocked with carbon. I didn't have a torch, but cleaned it with carb cleaner and a wire brush. The carb cleaner didn't do much, but the wire brush eventually got it clean. After re-installing the cleaned screen, my weed eater has its old spunk back. Thanks!
nice work, and thank you for watching Cliff Bell.
Hello, I have watched this video with interest, as over the years, I have never seen a dirty filter screen, but I have a new McCulloch B40P that starts and runs well but when nearing full revs, the acceleration up to speed tails off over a few seconds instead of suddenly reaching a plateau then running at fill revs like my Husqvarna 128.
Maybe the larger engines develop power at less revs .but I don't feel everything is OK. Any ideas 💡 please , Ian😊
sure, I would check the screen for a clog, and if that's okay, I would lean towards the carb being the issue.
is red fuel mix good
I believe so.
quick question do you think stihl grease would work with echo and shindaiwa
I don't see why not, but I would use what the manual says to use instead. your choice
You helped me out today! Appreciate it. My exhaust screen was carbonized. Took my needle nose and cooked it on my gas grill side burner. Put it back in it. Ran like a Stihl should!!! I owe you dinner. Here in the Show Me State.
I'm glad I could help!
Another great vid mate, more tips on diagnosis. Yeah i would try what i have on hand first. Cheers.
Thank you Aussie nebula.
Hi am having a 4 stroke Honda I never had to clean the exhaust nor the spark plug more weight but for me it's a cleaner engine 😊
I hear what you're saying
My 2 stroke snowblower doesn’t have a spark arrestor since it is hard to start a fire in winter. It would clog up pretty quickly if it did have one due to how much oil the thing burns. I have to run the thing on a really rich mixture to keep the thing in good condition. I have had to get rid of the carbon on the plug because of it though
that completely makes sense.
@@INSIDEHOUSEGARAGE Makes no sense to me. Spark plug fouling is totally contrary to his comment 'operating in good condition'. I can't remember ever fouling a spark plug on my two stroke equipment and no old age / memory loss comments please.
Which blue oil do you use for weed eaters like in the video? Can it be used for professional Stihl Weed eaters as well?
you can use any normal or synthetic 2-cycle oil
It's Blackmax synthetic Oil from Wally World.
you got it.
Nice video! That trimmer had a lot less smoke with your 2T mix. Maybe the owner ran mix too much oil?
Since the sample was so small it was hard to tell, but it would make sense if they had too much oil In it.
What my fs 85 did and a new carb perked her right up
nice job!
Nice fix! I would probably try soaking it, then scrubbing. Thank you for the video
that's a great idea. Thank you Catcha Cow.
Ultrasonic cleaner and degreaser helped alot wire brush also helps
yes they do
i took screen out new plug,air,gas filter fresh gas fuel stailizer still dies full throttel any idea new carb 2 yrs ago
sure, adjust the carb, and if your carb can't be adjusted, get a new carb.
Thanks you, your video help me to solve the problem
You are welcome
With the big jar with that green gas it looked like pickle juice.
yes It did
I watched your video and then fixed my stihl trimmer that was struggling to run at full speed. I went directly to the screen in the muffler. It was about 80% blocked. Used your torch technique and wire brush. It now runs like new. Thanks for the great video.
Glad it helped
Thankyou! Just yeeted mine
anytime
I would suggest easing up on the heat a little bit because you'll change the chemistry of the metal make it brittle or aneal the screen I suggest the combination of a small bit of heat and then compressed air and a small metal brush
thank you for the advice
@@INSIDEHOUSEGARAGE or on the spark plug a small piece of fine Emory paper
Never be too rough on the electrode or change the gap
Thanks! Great video!
no problem
Thank you. You solved my problem with the screen cleaning suggestion. Many thanks.
no problem and thank you for your time
Thank you for this helpful troubleshooting! What microphone do you use? The audio sounds great!
thanks I appreciate that, I'm using Samson G Track Pro, which you can get at Best Buy. I've got the gain set to about 75% of its full turn, sorry no markings on it. And I'm added a bit of gain in post.
Thanks! Followed your instructions to burn the carbon off the spark arrestor and worked like a charm - simple fix that had me back up and running in a few minutes. Well done!
Glad it helped!
Bro thank you so much I just paid like 500$ for this machine because I went through 5 ryobi 4cycles in the last 3yrs of busniess. And this was only a month old I was sooooo passed. Thanks for the tips man
Glad I could help
Thank you so much for posting this video. Suddenly my 14 yo Stihl trimmer would only run about half throttle. I replaced the spark plug, air filter and fuel filter. Still wouldn’t run wide open.
Found your video and checked the exhaust screen. As soon as I pulled it out of there, I knew that was the problem. Completely black and plugged up. Before today, I never knew that screen existed.
Burned it clean with a torch and about 20 minutes from start to finish it was running great again. Really appreciate your video.
no problem and you did a great job fixing it!
Yep I have the hedge trimmer version of this line trimmer. Same exact engine, assembly etc. I took off the spark arrestor and ran it with it off and it was like the issue never even happened! Thank you for sharing your knowledge and expertise my friend!
no problem and Thank you for sharing that
Stihl is a nice brand, but I defiantly think the fuel they want u to use on their. Equipment is very expensive. I also think their trimmers are a little heavy. I had a strap top tp put it around my shoulder but man, it was just not a good feeling. Now people say the fs94 r trimmer by Stihl is the best and mightier of them, i have not yet tested it. Now my question. What is one piece of equipment you dream of fixing, is their any specific avchine you want to bring on the channel top show the people hw to fix. Any brands. Also for Engines in general for lane equipment, what brand do you like, Briggs, tecumseh, Kohler.
I completely agree with you, they are vey heavy. I would love to work on a Honda 3000 inverter generator some day.
Usually I use a wire brush and a paper towel to clean any carbon, it doesn't work as well as a torch but I don't have one and I don't want to take the time to light a fire to clean it. That method works well enough for me. The paper towel does tear and leave remnants easily, so i do have to be careful.
That's a good idea! Thank you Carroll Montgomery.
Thank you very much! My spark arrester screen was inside of the muffler outlet and the entire thing screwed out like a spark plug. Cooked it with the torch and touched it with a brass brush and it runs like new. Wasn’t previously aware of these screens, so I learned something and my machine runs like a top! Thanks again!
no problem and great work getting it working again
Ah yes, fire fixes all
sure does
Mine is a troy-bilt and the spark arrestor is built into the muffler, so I soaked it in degreaser, and flushed it through with the hose and the airline and let it dry; the propane torch method would work as well it just means heating the area where the arrestor is located, the arrestor is visible you just can't remove it like on the Stihl.
nice work, I'll have to try that method
I would clean it the same way you did. If you switch to Echo Red Armor oil you screen will never clog again. If your screen is a little dirty it will actually over time clean it. I started using it 2 years ago and have not had a screen clog or a fouled plug or carbon build up problem since I have been using it.
Yes I need to switch, then this won't be a problem. Thank you nashguy207
You could call the Fantastic Four! I would probably just use the torch.
thank you Bruce Coleman.
You saved me $. Exactly what was wrong. Thanks
No problem !
I would probably use a propane torch as I already have the cans for camping stoves and there is always uses for a torch
that makes sense
Take that spark arrester screen and throw it in the trash!
Unfortunately that's not recommended
@@INSIDEHOUSEGARAGE idc if it’s not recommended lol.
Great video my friend. Did the job for my Stihl. Thank you
Glad I could help
I usually throw them away if they are on my personal equipment, but I usually use carburetor cleaner and a wire brush
thank you Donald Bower
I had this exact problem on my Stihl FS-85 trimmer. The screen was clogged about as bad as that one was. I just decided to remove it completely. I totally understand safety, but, I don't live in an area with a high fire danger, so it's fine lol. I switched from Stihl HP Ultra oil to Opti 2 oil, and there are zero problems with the engines. I mix it at what the bottle says to mix in 5 gallons of fuel, Throw in Ethanol-free fuel, and all my 2 stroke equipment runs great! Awesome, informative video as usual! Thank you!
No problem Jacob Feather, I appreciate it.
You saved me. I had no idea about the exhaust screen. I burned off and she is purring like a lion!
no problem and you did a great job fixing it
The screen was my problem. Working good as new. Thanks
Glad it helped
I pour it in gasoline and then clean with wire brush. Works every time
Nice job, I'll have to consider that method In the next video where the screen is clogged. Thank you
Thank you
You're welcome
Thank you for your helpful video! You saved me a trip to the repair shop!
Glad I could help
You always have great information. My Stihl FS 38 started dying after about 1 minute of running it. It would die and backfire thru the exhaust. I did check the arrestor and it did have carbon. I cleaned it and still had he problem. I then put on a Stihl carb. plug, lines, filters, clean gas and oil and I still have the problem of it dying and backfire. Do you have any suggestions? Thank you.
wow that's one very stubborn trimmer. Because of the backfire, it tells me that the carb is flooding the engine while in use. Is it stopping and backfiring only while using it on the grass, or will it do it while it's just idle too? IF so the carb might just need an adjustment
@@INSIDEHOUSEGARAGE Thank you so much for your reply. It does die while using it on grass. I guess I thought the carb, being new, it was adjusted correct. I'll try your suggestion. Thanks again..
Thanks so much its was my exhaust screen
You saved me lots of money
Glad I could help
I have mcculloch weedeater but the head won't spin
can you spin the head by hand freely? If so, think the drive shaft might be damaged.
Nice fix. I would use my propane torch to clean the screen.
thank you Tyrone Clarke, me too.
How would you deal with a spark arrestor screen built inside a muffler ? Would you take the muffler apart to get to the screen or would you replace the muffler ? 🤔 If you got other options feel free to tell me 😄
If that was the case I would drill a hole thru the deflector if it has one ,thru the screen.
I would remove that screen
I thing most people would too, thank you Vetko's Garage.
I always throw mine in the garbage, you're the man.
thank you
I would shy away from using Stihl mix oil unless you keep it wide open 80% of the time. I’ve had great luck with Echo Red Armor even at a 40:1 ratio. I’m doing an experiment with Amsoil on a cheap blower and getting good results at the recommended 100:1 ratio which is something I never would have expected. I tried it at 50:1 and it was just too much oil residue. I have ran this thing in a shed that was 110 degrees tank after tank and I can’t kill it at 100:1 with Amsoil. Don’t think I would try it with a chainsaw even though people do with good results.
thank you for the Information Andy Becker.
I use my lighter all the time, it’s always on me.
nice, they're super hand to have around, thank you Andrew Yearwood.
Yes I recommend using the Stihl Oil, I’ve always used it and never had any problems except for the spark arrester.
Every Stihl Dealer will tell you to use it at full throttle, which in nature isn’t a normal thing we don’t drive our cars or motorcycles in that manner.
The Stihl Oils like the blue one which has been superseded by the red one or the semi synthetic green one have good lubrications of the pistons but the downfall is the spark arrester clogging with carbon.
The next best oil which was the manufacturers for the Stihl blue oil is Castrol 2T Garden, it is also blue but the only difference it uses less blue dye, as Stihl May requested a larger quantity of dye in their mix which makes easier to identify the mix as 2 stroke oil.
thank you for all the information Rick Thelian.
how do you find all this equipment
Some I find, others are friends coworker or from family
This is a must see video fixing your weed-wacker. It’s going to save you money and honestly fix your problem.
Thanks so much.🍻
hey thanks
no problem
Depending on the amount of time in the garage I normally would throw the screen in my 1 gallon carburetor can. It's the one that has the basket and for a life of me I cannot think of the name but you can pick it up at any parts store. That solvent whatever it is does a great job on carbon. After I take it out I go to my parts washer and rinse it off in there and then dry it and put it back into its proper place. When I'm in a hurry I do the blowtorch method. Over my years of life I have had a lot of people who had father or husbands that passed away and they give me their tools. Over the years I must have at least five or six different propane torches and I make sure to always have cans of propane sitting on the shelf. I never tried cleaning the screen with my acetylene torch I would think that's a little Overkill.
As always I enjoyed your video and look forward to the next one.
thank you Davide Frank for the information, I appreciate it.
Very helpful! Thank you!
you're very welcome!
Wouldn't heating the spark plug like that effect the temper of the plug?
wouldn't using the engine, temper the plug then too? there's not effect on it.
@@INSIDEHOUSEGARAGE OK, Makes sense.
Great video.
What is the model number of that sparking tester? I'd like to purchase one. Thanks
it should be in the links in the description and thanks for your interest
@INSIDE HOUSE GARAGE You're welcome..Thank you. I didn't even think to look there.
Happy Thanksgiving to you and your family
thank you Larry, you too.
I really like this channel an have Learned alot from here. Thanks for all the great info.
Awesome, thank you Arthur Williams!
Did you check out the muffler
yes I did
i love this channel. Always interesting and helpful videos
Happy to hear that and Thank you Hikemore Can
Throw the screen in a trash can
I put it back on for peace of mind but you're welcome to do what you want.
Needs a carby ajustment
thank you Peter Barber
One question is were is the young lady that a video or two for your video.s the speak arrestor screen is blocked it can cause back pressure to cause the engine will be not able to go to full power
You are absolutely correct. She was let go from the Company I work at back in April.
@@INSIDEHOUSEGARAGE That breaks my heart to hear that she got let go 💔
It hurt me more than I though it would.
@@INSIDEHOUSEGARAGE it's so heart breaking to see a co worker be let go like that
very true.
Hello again! I have got 2 weed wackers that I’m getting for free tomorrow one is a stihl fs36 and a weed eater PL500
Nice, and nice to see your comment again.
@@INSIDEHOUSEGARAGE I’ve gotten the stihl to run as it came with a brand new carb so all I did was clean the spark arestor screen and now it runs quite good but there’s still something wrong with it as the trimming head does not spin at low or high rpm :(. Edit: it also doesn’t want to run when off of full choke what should I do?
Even thought carb might be new, it might still need to be adjusted to the engine. An adjustment should fix the issue.
@@INSIDEHOUSEGARAGE alrighty when i get back home I'll give it a try
Thankyou!!!!
You're welcome!
Thanks! I used my trimmer at half speed for long periods of time, rookie mistake. Had lost full speed on my 2 yr old trimmer, repair guys long ways away so this saved me time and learned what not to do.
glad It was helpful
Good catch!
Glad you enjoyed it
I did. I have forgotten about the spark screen more than once and later gone back and cleaned it, then everything was good.
Sometimes you could just run less oil. It'll run faster
just the one time
I will try that I think I may have too much oil
I have that exact trimmer, and the spark arrestor was the problem too. Same situation was happening with my Stihl chainsaw a couple years back so I had a good idea what the problem was. Excellent video!
Thanks for the info
Take out the screen on the muffler. You can do that on any long equipment
it's not mine to remove
Never seen someone clean a plug like that good work
thanks
Lawn equipment
yes
I would do EXACTLY what you did. Same approach. When an engine does not reach full throttle, many times people start messing with the H speed screw when the culprit is the spark arrestor screen. Thanks for the video.
thanks for the comment and you're right A Patterson, .
Thank you for the video. Just fixed our stihl fs40c and an older f46 model with the screw in spark arrestor. Both arrestors were completely blocked with carbon.
no problem and thank you