Stihl ms 170 bogs down, stalls out when starting

[@anthonylehner3643]

I was having problems with my 180 c that fit this description so I decided to watch this. When the video started I immediately thought "what's this kid going to show me that I don't already know?" Who would have thought to even look at the muffler screen? The boy nailed it! Before watching the video I disassembled and completely cleaned and blew out the carburetor, dumped the gas and put in fresh mix, and new spark plug. Still ran like crap. I thought to myself "it's got air fuel and spark, and it runs, what the hell's the problem?" Well, if the exhaust can't get out it doesn't matter what you put in it!🤣 It turns out you can teach an old dog new tricks! Good work my man! I hope this video has helped many others!

[@fighterpilot6461]

I'm over 70 LOL He's hardly a boy, he's a young man. When someone's ambitious age is not a factor.

[@anthonylehner3643]

@@davidwillard7334 THROW! YOUR! PHONE! AWAY!!!

[@fighterpilot6461]

@@davidwillard7334 smartass they have shut down the mental institutions, but there is a cell waiting for you just the same. Start looking over your shoulder. From young men to Old Men you have no filter. it's about to be your undoing.

[@anthonylehner3643]

@@davidwillard7334 Someone could probably benefit from some anger management counseling🤔

[@anthonylehner3643]

@@davidwillard7334 I'm not a counselor I just play one on TV...

[@carlwiegleb706]

Great tip!! I have a MS 180c that wouldn't rev up. I had checked and cleaned the carburetor but it still wouldn't rev... watched your video, checked the spark arrestor screen and it was plugged nearly 100%.

[@v26224]

Glad it helped

[@jazalessandro3094]

I removed my screen,problem fixed!

[@karlrovey]

Mine has done that from brand new on cold starts. Once it has warmed up, it's fine.

[@larryekman2078]

Really helpful. Had already changed spark plug, air filter, fuel pickup body. Doing the screen cleaning was THE most helpful. Using a torch to burn off the carbon worked like magic. Many thanks.

[@v26224]

Glad it helped

[@davidwillard7334]

ThROW !! IT !! AWAY !!

[@kalelisking]

@@davidwillard7334 Why? I have a Ms181, MS462c and a H550XP..this has helped me quite a few times now. Surely you're not a BRAND nut! Husqy, Stihl...just cut some wood mate. This is some good maintenance info.

[@carlsylvester1357]

😊

[@GripFreak]

All you guys suggesting leaving the spark arrestor screen out realize that if you're a repair shop and you leave it out and the customer takes the saw and starts a fire you are liable and this is against federal law. You could be fined and imprisoned. This young man has gave some great advice in his video and in the comments section. Probably knows more than you may realize? I'm an EETC 2stroke certified tech if that matters. Great job young man!!! Stay with it! ✌

[@davidwillard7334]

THAT'S !! WHY !! YOU !! NEED !! TO !! THROW !! AWAY !! THE !! ARRESTOR !! SCREEN !! STRÀIGHT !! AWAY !! FOR !! PEACE !! OF !! MIND !!!

[@brandonhamm8210]

8i8p0p

[@93blackwing]

Thank you, I have the same model doing the same thing, watched your video, my screen was plugged solid, cleaned it now it runs great.

[@v26224]

Glad it helped

[@davidwillard7334]

THROW !! IT !! AWAY !!!

[@michaellalko7132]

I was having the same problem w/ my Wood Boss 024 AV. Changed out the plug, put in fresh gas but no luck. This little video did the trick.....thank you.

[@davidwillard7334]

JUST !! THROW !! IT !! AWAY !!!

[@whatme3473]

Dude not everyone would think of that well dun you just saved my chain saw. Cheers mate

[@davidwillard7334]

JUST !! KEEP !! IT !! NOW !!

[@farmnranchapiarybeehiveser8120]

@@davidwillard7334 expect the authorities

[@andrew5550]

Here in the states we just remove those screens as well as the metal baffle...leaving just a bare Exhaust inside.Great video 👍🏾

[@v26224]

unfortunatly due to fire safety rules we cannot do that.

[@danielralls1308]

Just had same thing done last night left it out could see anything in the screen looked like a slow peace of metal thabks for showing me how to clean screen . it run better without out it faster .thanks

[@v26224]

glad i could help

[@blueyhanson6253]

Australian models generally follow the trends, and all my saws have the spark arrestor screen. I use a butane gas torch to clean them occasionally, I also don't rush into using the saw - I let them warm up for a few minutes on idle, that gets the fuel flowing through the fuel system and gets the oil lubricating the chain/bar. In theory if fuel is good, and the saw can breathe it should run. And keep it clean. 😎

[@steveboettner409]

Your idea of using the heat gun worked great. After scrapping the screen try using a stainless steel wire brush this will clean up the screen even better. Comment from one of the other videos he put the screen in acetone which took considerably longer to clean screen.

[@v26224]

cheers thanks

[@davidwillard7334]

SHOULD !! HAVE !! THROWN !! IT !! AWAY !!

[@anthonylehner3643]

Lacquer thinner and a fine wire brush works instantly

[@danballarin]

I watched two other videos that showed how to fix a Bogged chainsaw but never showed what it was... Thank you! I think I found my problem

[@v26224]

glad i could help

[@greghollands3628]

looks like that saw is pretty new. I am surprised that the spark arrestor screen was clogged when the saw hasnt done much work

[@v26224]

@@greghollands3628 saw was about 10-15 years old, just well maintained, and it had recently had a new bar and chain

[@ricardomateo5692]

Thank you, will ry it, Anoher tip hat I heard is that if we not going to use the chain saw for at least 3 mos. ,we should remove fuel (petrol and oil mix) cause they said in the end oil will separate from petrol or gasoline and will clog certain parts in the fuel system causing the machine not to start.

[@HDgodfrey]

Think you just saved me a teardown! Thanks a million.

[@v26224]

Glad I could help!

[@HDgodfrey]

@@v26224 As an update you 100% did. Tiny little hole left for air before cleaning and after she's running like a dream! Truly grateful!

[@davidwillard7334]

JUST !! THROW !! IT !! AWAY !!!

[@HDgodfrey]

@@davidwillard7334 your right, it started bogging again. It's that stupid carb. Im going to check my cylinder and, if it's good, do the adjustable carb upgrade.

[@hjazlee6098]

Wooo, brooo. This video help me 100%. Tanx from borneo Island. 👍

[@davidturner7363]

Great mate my one was the same and your vid saved me buying a carb kit... Top tip

[@v26224]

thanks. glad I could help. hope the saw is running good now.

[@Bernieclark45]

Well done for showing before it was fixed.

[@fighterpilot6461]

Thank you young man unfortunately I had already clean my screen and all the other obvious. Even using high octane ethanol free fuel. I fear it's the carburetor since there is no adjustment for the mixture which is asinine. Mixture changes with altitude due to atmospheric density. Just glad I bought it in an auction. LOL. Curious if there is a way to tweak mixture even without a mixture screw. It bogs and stalls even without a load.

[@anthonylehner3643]

If you have a 180 it does actually does actually have an enrichment screw. There's only one and it's very small and in a discreet location behind the handle. I get the feeling Stihl didn't want anybody messing with it.

[@fighterpilot6461]

@@anthonylehner3643 thanks, mine is a 170 I did find that screw I thought it was for idle speed I checked eBay I can actually get a new non-branded carburetor with tune-up kit for $11 at that price I ordered one. LOL That gives me an extra filter, plug, oil pump, and lines also. I kind of think somebody was running ethanol fuel. And it has a bad diaphragm or something. With that said there's not even any paint or off the bar. Things went cheap at that auction chainsaw was only $63. I even got a almost new 60" inch brush hog for $185. Appreciate the response, take care stay safe.

[@karlrovey]

@@fighterpilot6461 The newer MS 170 has adjustment screws.

[@pevaughn]

Had same problem with mine. Carb ran too rich no matter what...fouled plug and screen every tankful. Swapped out carb to an adjustable one (Walbro WT-215) drilled a few holes in the cover for access to high and low screws... runs great now. Oh yeah.. also opened up the exhaust... more power...sounds great. Nice light and good power for the size.

[@ZoomStranger]

Great stuff mate - good first vid - saved me playing with the carby. Thanks and the GoStraya was a winning touch - subscribed.

[@davidwillard7334]

ARE ! YOU ! DISLESSICK !! WITH ! CARBURETTORS !!??

[@randykilcollins5661]

I actually had problem bogging down. It idled great . I actually took carb off then thought about something I put it back on and reached for my can of carb cleaner ! Wow ,sprayed in the carb while running and it shut down. Let it sit ran it up again but took a lot of pulls . Ran it up sprayed again and did a few times about 1 hour total let it sit between sprays. Well runs great not taking carb apart and it cleaned the varnish dirt that was in the jets ect ect.. try it!

[@v26224]

Randy kilcollins carb cleaner is a good way to ruin your cylinder, it lacks lubrications

[@tubro007]

Where do you spray the carb cleaner into the carb?

[@jefftube99]

If you're watching in the UK, as I am, our Stihls don't have the same exhaust system - there's no spark arrestor screen so you can't clean it!

[@temsbab1565]

Any idea what's up with mine then

[@DTuckerMD]

Thanks, I'm having exactly the same problem with the same saw. That'll be the first thing I look at.

[@v26224]

Glad I could help

[@DTuckerMD]

Turned out to be the can of Tru Fuel I was using. According to the manufacturer, it was a recent batch but a fresh can with a different date code fixed the problem.

[@brenbrady]

I did this and when I took the muffler off there was no arrester screen. Gave it a good clean anyway but when I tried the start the chainsaw, I ran but as soon as it was idle it could out and I could t get it started again.

[@almollitor]

Good tip. I'll check my saw. I have a similar MS 180C. Ethanol in gas really causes problems in these saws. Use premium gas and gas treatment.

[@gregschultz2029]

Al Mollitor ,Non Ethanol Is What You Want ,Or Trufuel , The Alcohol In Ethanol Gas Is The Problem,No Amount Of Fuel Treatments, Will Get Rid Of The Alcohol That Ruins A Carb In Small Engines !!!

[@jazalessandro3094]

I left mine still for few months with ethanol mixed with fuel stabliser & no dramas!

[@nicksorella6828]

Thankyou for your video, simple and instructful.... it helped me to fix my saw .

[@v26224]

Great to hear!

[@davidwillard7334]

JUST !! THROW !! IT !! AWAY !!

[@SusanVaughn-v6d]

I’d like to see you test run it on some log doughnuts. To see if it holds up.

[@icespeckledhens]

My 181 has the same fault, the dealer cleaned the carburretor but still the same. I took it back twice and they said it was running normally but it was not. I took it back a few weeks ago and they said the carburretor was faulty and it was my fault because I hadn't used it. I said how can I use it if it will not start and walked out. I'll give your procedure a go but there could be old fuel in it. Not happy at all with them.

[@v26224]

cool. let me know how it goes

[@davidwillard7334]

PUT !! IT !! STRAGHT ! INTO !! THE !! METAL !! SHREADDER !! FOR!! PEACE !! OF !! MIND !!

[@bobbucks]

What if its not the problem? My screen was fine but it still bogs down and often stops. New spark plug.

[@MultiBubz]

Thanks a lot worked like a charm

[@punaroots9857]

Thank you. Just solved my problem 🤙🏽

[@mikepatterson57]

Screen Looked Ok;-) Peace

[@CyberSamurai84]

Thx for advice! Definitely will see if this works

[@laverdajota8089]

Just a thought, ????could you use oven cleaner liquid to remove the carbon from the spark arrester , would this be safer than scraping it. In the past we used caustic soda on inside of our exhausts on two stroke motorcycles, oven cleaner has some caustic soda in it , comments on above please

[@v26224]

i just use heat, it is easy, fast and isn't going to do any harm to the machine

[@laverdajota8089]

2 Stroke, Running and repair Hi , I was more concerned about damaging the wire gauze, that’s my reason for thinking of oven cleaner,

[@JackMcCoy331]

This saw is doing it brand new after the first use. Any suggestions?

[@v26224]

possibly a defect or you have run the wrong fuel mix through it

[@tristanburke2451]

You cannot adjust the carburetors on them 170s besides the idol they have it set that way for emissions control

[@v26224]

cheers for the tip

[@karlrovey]

Really, because mine has adjustment screws and came that way.

[@TheNowNudda]

Use the choke. The carb switch has indicators on built-in

[@davidwillard7334]

JUST !! THROW !! IT !! AWAY !!

[@Xandro.Lombardi]

If we try cleaning the screen with fuel instead, would it still work? I don't have a heat gun.

[@davidwillard7334]

JUST !! THROW ! IT !! AWAY !!

[@SEOKLADUCKIN]

Remove pos non adjustable carb with walbro adjustable, gut muffler and add a bit of timing, they will run really good

[@v26224]

chose not to. it works fine as it is

[@tonjashafer9251]

thank you...good job explaining...it fixed mine..

[@v26224]

Glad it helped

[@HeathStevens]

Best thing to do is to remove it. I have an old Stihl 021 and I removed it and cut some fins in the muffler. It runs so much better.

[@v26224]

That’s a good solution for some people however in Australia where we have extreme bushfire risk it’s actually illegal to run saw without it for much of the year.

[@tristanburke2451]

Another thing the fuel line could have very tiny cracks in it or the base gasket could be blown or the intake could be leaking or the crank bearing seals small engine repair that's what I do for a living

[@v26224]

the McCulloch man, lots of possibilities, but as always, start with the simple things before going to more complex issues

[@jordananderson8299]

Mine behaves like that but the muffler screen wasn't clogged

[@anthonylehner3643]

If the gas is more than a month old dump it and go get some new stuff. If that doesn't do it, assuming you've already checked spark plug and air filter, you will want to do a full carb disassembly cleaning and blow out with compressed air if it has been sitting for over a year with bad gas in it. I always empty the gas tanks on all my small engines and run them completely out of gas when I'm putting them away for the winter.

[@karlrovey]

@Anthony Lehner A lot of these MS 170 saws are doing this from brand new, even with good gas. It's only on a cold start, and the saw runs fine once it has warmed up.

[@loganthesaint]

Mine does the same thing, but it’s not the screen, my fuel pressure in tank and line is good. Gonna adjust the carb I guess if I can’t find anything with wrong with spark or plug.

[@dianecarter9919]

Djvvvv

[@craigkeller]

Great job young man!

[@v26224]

cheers

[@davidwillard7334]

LOOPY !!

[@shonshon247]

Thank you. Helped a lot.

[@v26224]

you are welcome. if you could like and subscribe it would be great

[@dimitriyalousi1015]

Legend! Thanks bro

[@nevilfuckingbarthos3937]

Thanks for the vid! Very helpful

[@raimonchannel]

good job broo

[@titchglover2601]

Works on the ms250 also 👍

[@curve5746]

Nice Bar

[@Danny4rb]

Yeah this is exactly what my ms171 is doing except mine is BRAND NEW , used it once then it started doing this

[@giuseppelatina2640]

Hi one of your subscribers here in Melbourne Victoria what brand and type of 2 stroke oil do you use in your hand held equipment,good videos you are making regards

[@v26224]

i use jack max oil, but i would use whatever your manufacturer recommends

[@maddogrk1]

I’ve never seen it clean that way. All the ideas I’ve seen use either fuel or some other chemical like nail file remover to get that stuff off with a scraper. Your way it looks easier and faster and cleaner. I think I’ll give it a try. Thank you

[@v26224]

cheers

[@saab93contdi]

My MS170 dosent have the screen ..any other ideas before I dig deeper ? Thanks

[@v26224]

Andy Ollier, make sure the fuel and air filter is clean and the spark plug isn't corroded or sootted up.

[@saab93contdi]

@@v26224 Thanks New the plug wasnt fouled and air cleaner wasnt to bad so tried the fuel filter. Looked fine. Did a suction test on it against a spare new one. Old one was very hard to blow ir suck through. New one fitted and jobs a good one. Thanks matey.. I do no about engines but thought there's a generic problem with ms170 Turns out even tho your saw isnt old and fillter looks ok, shows how probkems get over looked. Just got to sort out my Ts 410 that ive rebuilt with new cykinder and carb kit. Wont start. Thi nk ill look at fuel filter again.. Thanks againg

[@GHULAMABBAS-bs4hy]

Dear beater 1st is open the Guide bar

[@mistergrendel32]

Could you clean the spark arrester with a wire brush and mineral spirits? Good video. Let’s Go Brandon! 🤔😜

[@v26224]

you could but much more labour intensive

[@buster2725]

my 170 has jets but cannot adjust them, ordered a new one all it has is blank spaces where the the jets supposed to be now what?

[@justmike5402]

He's right for me I took it out gas and a brush runs like new

[@andybeecroft5561]

Heat gun. Clever. Thanks.

[@v26224]

glad it helped

[@scott-jc5nd]

Well done!

[@v26224]

cheers

[@tommckeemckee9865]

Why was the saw that ran a different model than the one that didn't?

[@v26224]

Tom McKee Mckee same saw

[@v26224]

Tom McKee Mckee same saw

[@v26224]

Tom McKee Mckee same saw

[@richardschaffling9882]

Good video but my saw s only four months old and it will start and run fine then you shut it off and then it does what the saw does

[@yeager6882]

11 times out of 10 it is a fuel issue and/or flooding. The spark arrestor is going to get carbonized because you continue to use improper fuel flooding it while starting it.

[@v26224]

not always. due to the non adjustable carb running with a fixed high jet, the saw can run rich on fuel due to different air pressures and changes in elevation and temp. the excess of fuel leads to more carbon build up and heat over time wile running at peak RPM

[@tonyelstone3003]

Nice one.

[@v26224]

Thank you! Cheers!

[@daveprototype6079]

Good video New subscriber Cheers

[@danielacorrea5266]

I was running this saw for about 2 hours at about a 30-50% duty cycle kzbin.infoUgkxfQm1wmg0ItKDLavxj1nXtQY9HP7EF504 and it did a great job. I used the lever for the built in sharpener to clear chip buildup out more than to actually sharpen the chain. It managed to cut some hardwood stumps much larger than it's size without bothering the neighbors with hours of 2 stroke noise.

[@vasilegirigan5096]

💯💯👍👍👍🤝🤝🤝

[@wulliesdad]

I have a MS 230 starts real good cold but will not start hot has maybe 50 hours on it?

[@chrishills5213]

bad ignition coil causes that issue

[@tristanburke2451]

And the first thing I do when I get any chainsaw is get rid of that stupid spark arrestor and make the exhaust holes bigger and then put the cover back on

[@v26224]

the McCulloch man. I use the saw in a high fire risk area. As such I keep the spark arrestor in and recommend against removing it.

[@kenangler8132]

Thanks

[@v26224]

No problem

[@mowerbro4212]

Leave the brake off Keep the clutch healthy

[@Hollywoodhouse74]

Muffler screen is plugged

[@barangfx3728]

mine is bogging down when trying to start it i cant find the problem.. i adjusted the L and H screws but not throttle. help me please :D

[@v26224]

that's no good. it is hard to tell what is up without seeing the saw in person

[@icespeckledhens]

Mine is not like yours, the spark arrester is not bolted on.

[@v26224]

181is a different style saw. it is located on the top left side as you are looking front on. it may pull right out.

[@buster2725]

On all these videos everybody knows about the spark arrestor,took it out, mine is stihl 170 very clean 2yrs old still bogs down, still like new still really clean. looks like carb is non adjustable,now what?

[@v26224]

Buster bob there may be a adjustment screw in the right hand of the handle. I may make a video on it. If not, go talk to your dealer

[@Tsiikki]

Rebuild carb with new diagrams. It is not adjustable.

[@willfunk9253]

Google still 170 carb mods. There is a carb you can mod to bolt right up with a low idle and high run adjustment. Did it to mine runs better then new.

[@JoseSanchez-wb5rz]

If just that bit of carbon deposit can hold the machines performance there was some bad decisions when this saw was made,I would remove the damn spark arrestor and be done with the problem.

[@v26224]

that is your choice. in Australia, if w e are using a chainsaw in national parks or during summer we must have a spark arrestor.

[@robertmadden7536]

Not a wise choice to run one without the arrester

[@JoseSanchez-wb5rz]

@@v26224 Well I guess I can thank the Lord for not being in Australia..

[@fighterpilot6461]

even though he didn't show it he did say he was cleaning the rest of Muffler.

[@lesterdudley7800]

Clean that sreen and put it back but it won't still keep running and there's adjustment on the carb

[@TheKrayusKorianis]

On the 170 and 180 models, there's only one carburetor screw... The LA. That's for your idle throttle speed. There are literally no other screws on these self-adjusting carburetors. You need to rebuild or buy a new one.

[@karlrovey]

@@TheKrayusKorianis Not on all of them. Mine has all all three.

[@srdjan272able]

my MS211 dont have that..

[@v26224]

very different style of saw.

[@darkshaman7087]

Be careful revving up machine straight away as could wreck engine, let it tick over first to warm it up then use 👍🏼

[@v26224]

ok, cheers

[@karlrovey]

When you first start it, it's designed to go to do a high rev until you give it a quick throttle squeeze. You're supposed to do that squeeze within a few seconds to avoid ruining the clutch.

[@darkshaman7087]

@@karlrovey you should let chainsaw run for about 5 minutes before use to warm up as the piston as it will expand and heats up quicker than the cylinder and if revving the engine up will cause it to rub and score the cylinder.

[@ego19893]

Until the motor is not warm dont pull the gas :( my gosh poor saw... after the saw started up wait 1 min, then work with it... Cold stroke rules

[@stevek4546]

ego19893 Amen, brother! I took a small engine repair class and one of the first things the instructor told us was let the engine warm up for at least a minute before revving it up. I see sooooo many people doing this and I make sure to tell them.... Some listen and some don't 😞

[@demacksgarage3000]

Actually a two stroke is better to give a little rpm but I agree that giving it full throttle isnt good at the start I have rebuilt saws and that's not the main killer but could be

[@fighterpilot6461]

@@stevek4546 yeah a four-stroke you need the oil to be warm in order to lubricate properly two strokes have the oil mix in it. I never seen professional loggers waste time warming anything up and their saws are their livelihood.

[@brucea550]

I know it’s what they teach but that is the worst way of starting a saw! When the day comes (and it will!) that the starter jams, you are yanking the rear handle right into your balls.

[@simonjlkoreshoff3426]

Onya digger

[@DrFroyd123]

This saw is a pain in the butt

[@tmaq9726]

Leave ther screen out

[@v26224]

that is an option, but not recommended due to the increased fire risk

[@davidwillard7334]

Why ! Don't ! You ! Just ! Throw !! Your ! Saw ! Straight !! Into !! The ! METAL !! SHREADDER !!??

[@v26224]

Because it still works

[@davidwillard7334]

@@v26224 SO !! HAVE !! YOU !! THROWN !! YOUR !! SAW !! INTO !! THE !!! METAL !! SHREADDER !! YET !??

[@v26224]

@@davidwillard7334 no because it is a perfectly functional saw

[@v26224]

@@davidwillard7334 WHAT!!!! POINT!! ARE!! YOU!! TRYING!! TO!! PROVE!!

[@v26224]

@@davidwillard7334 and what would you suggest I replace it with?

[@mrbjj1016]

Got a 170. What a POS. Waste of money.

[@v26224]

Mr Bjj 101 ok, this one works well and is a great reliable saw

[@mrbjj1016]

@@v26224 Mine sucks. Boggs down cutting through 12" birch. New chain no help.

[@v26224]

Mr Bjj 101 it's not really designed for 12" logs, get a bigger saw.

[@kenangler8132]

Liar

[@v26224]

Ken Angler cool story bro