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Can My Apprentice Diagnose This New STIHL Chainsaw That Won't Run After 1 Tank Of Gas? - Video

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Can My Apprentice Diagnose This New STIHL Chainsaw That Won't Run After 1 Tank Of Gas?
I recently bought a brand new Stihl chainsaw from a customer that only ran one tank of fuel through it and now it won't run!
I have deliberately kept the saw to test Dave my apprentice on his diagnosing skills!
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29 авг 2024

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Комментарии : 994

@thebradleysoncatbirdhill6849 3 года назад

Suspicion was raised already when they came right to you, Don, and avoided the dealer, lol! 😱

@jeremykatchmark3606 3 года назад

I work at a dealer and we also do repairs. The reason people often don’t come back to us for repairs is because we use the parts from Stihl, so a new piston assembly often times cost as much as the saw itself when you add labor.

@tornagawn 3 года назад

@@princetondaxton8483 you’re right, we don’t care.

@CAIDMASTEROFPYRO 3 года назад

@@jeremykatchmark3606 I think he more meant they didn't try a warranty claim

@PageMarker1 2 года назад

My initial reaction also.

@jonsworld5307 2 года назад

yea should been under warranty they know the dealer not cover damage due to no oil in gas

@stevewilliams2725 3 года назад

Good video, as an owner of a small engine business its good to see you passing knowledge to younger workers. Your apprentice seems eager and respectful and will make a good technician. Best of luck to him.

@DavesSmallEngines 3 года назад

Thanks Steve!!!

@donyboy73 3 года назад

yes he's eager to learn and very respectful, just the right combination!

@tedbryer2512 3 года назад

Hey Steve - where are you? I retired from a Stihl dealer in Peterborough.

@johnnellis3025 3 года назад

@@donyboy73 I have a husqvarna 55 rancher 53 c.c. with not many hrs. on it. I can't start it without removing spark plug and using starting fluid. Very hard to pull start, like it's vapor locked.Once it's started it runs great. Do these saws have a compression release? What else should i try?

@John-xv8no 2 года назад

@@johnnellis3025 my 251wood boss is the exact same way. Like this from New. You find anything out with yours?

@bendeleted9155 3 года назад

Novice tip: I have found that 90% of the time with older equipment that people give up on and sell at a yard sale, it's just a fuel issue. Bad hose or clogged jet or screen.

@X737_ 3 года назад

Or even bad fitting non sealing fuel caps, have had that

@cwytonweb 3 года назад

This is true enough for home-owner, big-box-store trash but not so much for a Stihl pro saw. In my area that saw will still bring $300, even with the blown top end.

@bendeleted9155 3 года назад

@@cwytonweb yeah, I've never found a stihl at a garage sale that wasn't running, come to think of it. I did find a 710 sold as inoperable once that just needed the fuel system flushed out, so it is possible. 😀

@jasonparsons9510 2 года назад

I've saved 2 stihl weed eaters from the scrap yard. Fuel lines were trash.

@normanmanning4872 2 года назад

LOL i watched a neighbour try and start his lawnmower and it kept stalling. he pushed it over to the curb and put free sign on it. i sent my son over to get it and about 15 min and a bit of carb cleaner and he was watching me cut my lawn with it.

@almolloy5817 2 года назад

Great video. Having just retired from 40+ years training automotive apprentices, I can see that Dave has a very bright future. Keep up the good work with him.

@donyboy73 2 года назад

Well said!

@williammoore2742 2 года назад

@@donyboy73 9

@williammoore2742 2 года назад

”o

@joepace33 2 года назад

I always thought you are a nice guy Don. And the fact that you are willing to pass your knowledge and experience to the next generation confirms what a super human being you are.

@scottfirman 3 года назад

Brand new chainsaw, straight fuel. I knew that without pulling the muffler. I could tell by looking at the spark plug, it was dry as a sand pile. No oil residue. Dead give away.

@MrDmmeeks 3 года назад

Kind of a give away it was user error when it goes to an independent shop rather than the dealer.

@JeffinTD 3 года назад

RC Hobby- at least he didn’t ruin a DA-200 worth three of those saws.

@tedbryer2512 3 года назад

right on the money!!

@DB-zp9un 2 года назад

@@MrDmmeeks Wouldn't have made a difference lol..

@gator9912 2 года назад

$700 out the door with a 20" bar here in Michigan love it

@bernardshelton7349 3 года назад

What a lucky guy Dave to be trained by one of the best technicians of small engines. Soak it all up Dave.

@guerrillaj 2 года назад

Dave yea Dave has a bright future in small engines, and I'm sure Dave soaked it all up Dave

@jawnjw 3 года назад

I’ve watched your vids ever since I got laid off from my machine shop that I worked at fir 12 years.I found another job but when I got hired they thought I was a mechanic even tho I wrote machinist on the application but I needed work so I bluffed them and been with them for five years now I started tearing down a echo timber wolf..never have done any small engine repair.there’s a lot to learn and experience helps And videos like yours is a blessing thanks for all your free help and this video is awesome because it’s teaching made fun...lol.

@DavesSmallEngines 3 года назад

Hey James! Thats a great story. Clearly you are capable!!!! We are having a blast making these videos and there is a ton more to come! Cheers!

@mychicosocial 2 года назад

I wanted to let you know that this was my first time watching your channel and was really impressed with the troubleshooting tips you both shared. I also think the chemistry between you two makes it fun to watch as well.. Thanks again

@davegoetz2825 Год назад

What did it cost to put a new piston and rings in the saw with labour. Thanks Dave Goetz.

@davidwee6927 2 года назад

We are indeed very happy to see father and son working together to give their individual advices to diagnose the STOHL Chainsaw that won't run after experimenting with other gases. . .

@spitfire690 3 года назад

I've notice this with cars too that it's like the clients think if they downplay the problem, it won't actually be that bad. "It's only a slight knocking from the engine" when it's really a broken rod.

@ryanbruner8928 3 года назад

I had one like this,every thing was the same,had spark,showed compression,but I pulled the muffler and BAM,scoring!! It turns out that the rings were welded into the piston as well! Good job,Dave!

@wildefox1478 3 года назад

I work on small engines and I'd suspect right away that the customer ran straight gas in it and the engine is trashed after being told they only ran one tank of gas through it and it's brand new. Great video!

@DavesSmallEngines 3 года назад

Hey there! Great guess. Thanks for watching!

@robertshoemaker6204 3 года назад

One of the give ways was the sound of the saw when you tried to start it...that funny sounding wez when you pulled the rope.....my neighbor came over with a newer Stihl 029 years ago couldn't figure out why his new saw wouldn't run...had that funny sounding wez.I popped off the muffler...cylinder and piston looked terrible heavy scoring...he used quality stihl mix...problem was he would put a bottle of mix for one gallon in a gallon fuel can and completely fill the can...the gallon can has made for expansion....he was filling can with 1.3 or so of fuel or so....like I told him he needed to watch the fuel pump and only meter in 1.0 gallons of non ethanol premium gasoline. Great video thank you Shoe

@joefriday950 3 года назад

Please do more videos like this. I really enjoyed it. The two of you work great together.

@botabob 3 года назад

I bought a MS291 a few years back. I remember the dealer had a hard time starting the saw and keeping it running when I purchased the saw. And I too had a saw that would not start/run after three tanks of fuel to have them check it out. It turned out to be a bad carb. It was fixed under warranty and the saw had been running good for me ever since. Thanks for the lesson.

@DavesSmallEngines 3 года назад

And rightly so! They should fix if.

@andybecker2693 3 года назад

A lot of Stihl products now have carburetor problems because Stihl bought Zama. The early autotune Husky saws had Zama carbs and MANY of those were replaced. I’m sure the 290 is good for a homeowner but $470 USD for a plastic case saw is too much for me. Echo makes a Farm/ Ranch saw with a magnesium case with bolt on cylinder for $400 that is 59.8 cc’s. The 291 is 55.5 cc’s. The Echo Timberwolf is better built, cheaper to own, and has more power.Sorry, no $500 plastic saws for me.

@andybecker2693 3 года назад

Actually I would buy the MS 261CM. A pro magnesium frame with a little more horsepower (3.76bhp-291,4 bhp- 261CM). The 261 is almost 2 pounds lighter. For an extra $120 you get a much better saw with the 261.

@botabob 3 года назад

@@andybecker2693 - Unfortunately, I did not know the difference at the time. I will run it till it wont run any more and then look at something better. I will look at the Timberwolf - any recommendations for a top handle saw? I had a Husky top handle at one time, but it was stolen from my garage along with 2 other Huskies and a battery powered saw. I appreciate you taking the time to explain this.

@paftaf 3 года назад

@@botabob Your next saw will probably be electric. I bought an ms362 in 2009. It’s gonna last another 50 years, but those new battery saws are amazing.

@imateapot51 3 года назад

I bought a 290 years ago after a hurricane. I read the owners manual and mixed the gas. I was never told that if you run straight gas you will ruin your saw instantly. I think dealers should drive this in to customers when they purchase saws or other 2 stroke equipment. I did get burned with the non metal non pro saw. A piece of plastic which is used for the choke, half choke, run, stop lever broke and the entire body of the saw had to be replaced.

@DavesSmallEngines 3 года назад

I know that exact piece. I had an Ms170 that did that.

@Devwithani25 3 года назад

Get a cylinder cam. Makes checking scoring more efficient. I figured it was toast when you said it won’t run after first fill up. But not everyone would have that tool so respect on showing full diagnosis.

@RaleysSmallEngines 3 года назад

Great job Dony and Dave !! As soon as I heard you say what the customer told you my first thought was water in fuel, then scored piston. My first step on most machines that come in, is dump the gas and see if it's mixed and check for water.. Easy and fast.. Then pull the muffler. Then check for spark. I really enjoy watching you guys, Ya'll work well together. I also noticed that I think Dave is a Left handed guy like me. LOL Hope ya'll have a great day.

@DavesSmallEngines 3 года назад

Hey Raley! Us South Paws gotta stick together! Good observation!

@EliminatorPerformance 3 года назад

If I hear that a 2 stroke ran on 1 tank of fuel and then won't run, open fuel cap and drain fuel. If the customer drained the fuel already, there's usually some left in the tank, so rub on fingers and if it evaporates it's straight fuel, if it leaves an oily residue it had some oil in it. You won't know if it was the proper mix, but at that point you'll at least have an idea of what was put in it. Then continue with inspection. Good vid!

@thomasmorris4914 3 года назад

You can also score a piston/cylinder by gunning a saw as soon as you start it to full throttle, not warming it up. In 1957 I was with a kid who's dad just bought him a new Olds coupe. It was zero degrees outside, he pegged the throttle to mshow off and blew the engine

@daleslover2771 2 года назад

In the classes of ASE Cert on rebuilding engines course, the last step is what is called cycling a engin, This is when you bring up your RPM to 1500 for 5 Sec than drop the Rpm down to 650 for 10 sec than back up to 1500 for 5 Sec then drop to 650 to 10 sec you continue to do this for 5 min your allowing the oil& compression ring to expand at a normal rate, with plenty of oil to the scraper rings, when this is done you bring your Rpm up to 1750 Rps then repeat as mentioned as above... From there you can go at a raised idle to what the engin manufacturing recommend. As a mechanic I have ask so many other mechanics if they were familiar with the cycling steps on a new rebuilt engine.1 out of 10 could, to where I quite asking. This is also applied to small engine rebuilds, where it's critical for ring expansion for compression...

@shadymaint1 2 года назад

I ended up getting a MS290 for free. Used to be a mechanic at a Stihl dealer. Customer brought in a saw that was only a month old or so. He said he let someone borrow it and they ran strait gas in it. Top end was toast. He just bought a new saw. Cost or repair was about the same as a new one. He just left the old saw at the shop. Had it under my work bench for almost a year. One day the manager came back and dropped a box full of parts on my bench. No work order which was odd. He said the parts were for the saw under my bench. I assumed the guy finally wanted to fix it. Manager said the saw was mine and here were all the parts to fix it. New cylinder, piston, rings, bearings and seals. Also put a carb kit in it. Still running that saw to this day.

@bnscholet911 2 года назад

I just subscribed to Dave’s channel, I love binge watching these after my honey to do list. Some people like to watch sports I prefer watching your small engine videos😂 Dave sounds like a really cool dude. Iv learned a ton. I’m so bummed it seems impossible to get certified by STIHL. 🤦‍♂️ but I try and lean as much as I can from y’all

@johnbenzinger3338 2 года назад

Thank you for all of your time explaining things! I wouldn’t have gotten my ms250 oil pump repaired without your careful explaining. Thank you again

@paulwharton1850 3 года назад

Excellent - Dave is really great. I've got the same saw & was shocked to find out the reason for this one not running - There is soooo much I could say about some of these people who buy this stuff ! Many thanks.......all the way from London.

@KarrierBag 3 года назад

I got a cheap B&Q chainsaw, said it was 50 to 1 ratio oil fuel mix, it was dead within a few months it was ment to be 40 to 1 barrel was so badly scored, my 20 year old homelite is still running fine though, couldn't affor a sthil so kept using my old a homelite and its the bees knees for my needs (live on a boat in UK so free fuel is cool) I kinda knew it was a fuel no oil mix as soon as the video started. Been using chainsaws over 35 years now. And you got a new sub too

@DavesSmallEngines 3 года назад

Hey Karrier! What model Homelite!?

@stefankroon4615 3 года назад

Knowing what they said about one tank of fuel, checking the fuel for oil was my first thought. I hadn't thought of the possibility of the client covering their tracks like that.

@tedbryer2512 3 года назад

One thing I noticed was the colour of the spark plug - that saw overheated and seized. That would make me go right to taking off the muffler. Also another hint would be a hissing sound when you took the gas cap off. I am a retired small engine mechanic for 50 plus years and am still repairing saws. I like your apprentice - he has a great attitude and is willing to learn.

@knudknollard3309 3 года назад

Please explain the hissing sound when removing the tank cap. You are implying that a blown ring can pressurize the fuel tank - please share what you know on this, and any other symptoms. Thanks!

@DavesSmallEngines 3 года назад

Hey Ted! Don is a great teacher. I am a lucky apprentice. Stay tuned for lots more videos here, and I do a bunch of longer repair videos on my channel. I am still learning... so go easy! Cheers!

@motivationlife381 3 года назад

As soon as you told him it was a brand new chainsaw ran once and then wouldn't run again I screamed no oil in the gas, sadly I have made that mistake once before I understood the two stroke I worked on 4-stroke prior

@dagrote1 3 года назад

Speaking of diagnostics, I had a case recently when the customer ran his Husqvarna 455 with the brake on, something he didn't tell me until after I'd stratched my head for a few hours over why it was going bonkers at high RPM's. He said it got so bad, it actually started a little fire near the clutch! It compromised the crank seals, which I should have detected with a leak down test right away. (But they're such a pain to set up!) It also puckered the oiler hoses. So after I installed new seals, it wouldn't oil the chain until I replaced the oiler and the lines. It was worth the cost of the repair, but he learned his lesson. And I learned mine. Complete diagnostics first!

@nashguy207 3 года назад

Great video guys. Good interaction between you guys. I bet the customer was sick when figured out what he had done to that brand new saw. I have confidence Dave can get this saw running. Thanks for sharing!

@DavesSmallEngines 3 года назад

Hey Nash! You bet. Stay tuned for the repair video on my channel and the follow up video here. Haven’t had a chance to pull it apart... but I will!

@ProfessorDisaray 2 года назад

Solid video Don, I've torn apart several STIHL chainsaws and you are so correct about the plastic saws. The plastic breaks down or heats up causing things to go very wrong. A little tid bit, if you run the chainsaw full throttle with no load it can cause the aluminum head to fail.

@lovestihlquality1369 3 года назад

What we don't know is how good was the orientation done by the dealer. Stihl doubles warranty if you buy six packs of oil or Motomix. That said, dealer should review gas oil mix especially with a new customer.

@DavesSmallEngines 3 года назад

You can only help so much!

@lovestihlquality1369 3 года назад

@@DavesSmallEngines You can't fix stupid.

@darrenpickens7147 3 года назад

Yes. Stihl will double the warranty if you buy the Ultra oil or motomix, but for residential use only. You don't get to double the warranty for commercial use (logging business or tree trimming etc....). Commercial and municipal/government use warranty is only 90 days.

@astroboy5137 3 года назад

If you have no idea you have to mix oil with gas. You have no business buying a chain saw. Every time I walk into my dealer they constantly try to sell you more oil.

@richardgerber7692 2 года назад

My brand new 261c ran beautifully first tank. I refilled, restarted and shortly wouldn't even stay running. Short story, I had "switched sides" filling up. The gas side was filled with bar oil, then run till it wouldn't. Easiest fix was a new aftermarket carburetor.

@matthewsmith6330 3 года назад

Very well done video! I've been a small engine mechanic for 12 years 5 of which i worked for STIHL and have seen this too often, good to see you teaching your apprentice good diagnostic skills, i knew it was scored the moment i saw the color of the plug and how dry it was as you would know the alloy from the piston and cylinder burns to the plug

@supastr33t 2 года назад

I can tell your a great teacher because of the patience in your voice.

@danielflack7902 3 года назад

That shows how bad the customer service was at the point of purchase. In Australia the dealers generally won't let you walk out of there shop without a good run down on the saws operation including fuel mixing. They want to sell there oil products to you while you are there, and safeguard their reputation. That's one expensive mistake.

@gushhnet 3 года назад

This is mandatory! - I co-own a Stihl dealership, extended warranty is allowed only if they purchase enough oil for the warranted period, plus people won't leave until all questions have been answered and they are properly educated on how to mix the fuel, store and generally use the equipment, I would rather stay 20+ extra minutes before closing the store and have them leave knowing all they need to know. Warranty can only be issued if we assemble and run the equipment ourselves (plus adjust the carb if need be) prior to the customer touching it. This is a must world-wide but not all dealers do it, some won't even register the serial numbers so no actual warranty Is issued (either way in this case it wouldn't be covered due to improper use, however I would argue the dealership is also at fault but not necessarily, this is why we have printed and signed instructions on how to mix the fuel and oil). You can tell when the serial number hasn't been registered in just a few seconds being an official dealer, I see this a lot alarmingly. But the most important aspect is safety specially when it comes to chainsaws, if this is their first saw I make sure they listen to what I'm saying and that if they've got any safety concerns they can ask all they want until they're confident they can safely run the saw, I take this very seriously having seen what happens when a bar and chain contact a person's face. Stay safe everyone and respect the saws. Even the MS170 is more than capable of ruining your day.

@Smalltechguy 3 года назад

That's exactly what my Deere dealer had done. In fact you can't get the warranty unless you purchase the Stihl oil and they will start it for you in the shop. Good class Don. reminds me of my instructor days...lol

@cwytonweb 3 года назад

You'd think that after a million blown-top ends from running straight gas that 2-cycle saws would have a WARNING sticker that makes it clear improper fuel mixture will DESTROY the engine. Instead all you get is a cryptic graphic of a gas + oil can.

@FishFind3000 3 года назад

@@Smalltechguy you get the standard warranty and you get the extended warranty if you buy either stihls 6 pack of oil or a gallon of moto mix. This extended warranty only applies to non commercial use machines.

@GWAYGWAY1 3 года назад

Same in UK they will NOT sell it unless you are actually present there to get instructions from them. To check you are not an numbskull and know nothing an also to show basics of that model. A man off the street cannot buy one without having a basic user certificate, other makes might not do this though.

@paulrooster2108 3 года назад

On 2 Strokes I use to take a lil strip of cardboard an either stick it in fuel tank or just pour a lil fuel outta tank on the Cardboard, It only takes about 2 minutes for it to dry . If there's oil in the fuel it will stain the cardboard several shades darker , sometimes you run your finger over the cardboard an pick up the oily residue . Very simple quick test , Usually I will do that right in front of Customer--- cause they will always say I used the " Mixed Fuel Can " to fill it .

@pchili4 3 года назад

Dave, you look like a kid in a candy store in that shop paradise! Lol

@SuperKwame1 3 года назад

Dony, you are a great Teacher!. shout out to you from SFO, Cali. I have been watching you for over 4yrs.

@donyboy73 3 года назад

Cool, thanks!

@jas350 3 года назад

Best of luck apprentice dave!

@germancarfan 2 года назад

I used to do loads of work on the 260 and 026, now I prefer the 261 it is a great saw. I have 4x 261's on the bench currently. They either need cylinder kits or cranks.

@MatthewCuba 3 года назад

Good stuff - definitely one of the best channels on YT. I have learned a lot from you and I liked the step by step diagnosis here... I think often we don't know the steps to do the diagnosis and just start replacing things willy nilly. Thank you sir!

@DavesSmallEngines 3 года назад

That’s what we’re after Matt!

@dustinhill330 2 года назад

Definitely do more of these videos, very educational and I like the dynamic between you guys.

@rafaabarca6163 3 года назад

Me gustan mucho tus videos, siempre aprendo algo nuevo, gracias por compartir y suerte dave.

@donyboy73 3 года назад

gracias amigo!

@KM-ts6co 2 года назад

Any other shop Dave would be a lead guy but he's leveling up here majorly

@heyinway 3 года назад

Premixed, in the long run, is the cheapest fuel. Always exactly the correct mix, no smoking caused by too much oil, no gumming or deterioration caused by ethanol.

@jamese9283 3 года назад

How much do you pay for premixed fuel?

@jamese9283 3 года назад

@@OOOOOO12345 Might be worth it if you only use a couple gallons a year. However, I am a pro using several gallons a month and could buy a new chainsaw every year with the money spent on premix. Bigger companies would be wasting 1000s. Mixing is easy and precise once you're used to it, and you can buy ethanol-free.

@heyinway 3 года назад

@@jamese9283 $3.99/qt

@le3045acp 3 года назад

@@jamese9283 screw premixed use 100ll aviation fuel at correct mix for your saw and you will never have fuel problems under 10 bucks a gallon right now here it is 5.50 a gallon

@bigtexas7580 2 года назад

*As soon as you said the customer ran 1 tank of fuel through a new saw and it wouldn't start anymore I knew right off the bat the customer ran straight gas in that saw.*

@adam4900 3 года назад

I didn’t know you could score a piston just by running with no load. Do you have a video with all the dos and don’t dos with 2 strokes?

@donyboy73 3 года назад

coming soon!

@DavesSmallEngines 3 года назад

@@donyboy73 Can't wait for this one!

@theone8308 Год назад

As a certified, gold level, stihl technician, I always look at the the fuel first, always. Second, it only takes another 60 seconds to take the muffler off to check the exhaust side of the piston. A faulty ignition module ( or control module in this case) is very rare. Also remember, there is at least a half dozen other reasons for a scored piston besides unmixed fuel. Most people automatically think that the customer ran unmixed fuel through the saw. (Not always true)

@nlowry8 3 года назад

We need an updated shop tour

@fillslawncare 3 года назад

I agree

@grampabadger 3 года назад

Only needs fuel, spark and air. Compression low is a giveaway that unmixed fuel was used. I had several customers bring back brand new saws after one tank, but claimed they 'had been using chainsaws for years'. Kept several of those 'throwaway' saws for unique parts over time. Stihl saws also have problems with fuel lines cracking, coils opening up and oilers plugging if improper oil is used.

@terrycobb2704 3 года назад

I've watched and learned alot from you guys. Love watching. I realize no mixed fuel is bad but how about too much oil? What does that do to your saw? Will that burn up the saw???

@crackpotfox 2 года назад

A 2 stroke with too much oil will run a little crappy, be hard to start, and might end up messing with the spark plug. Nothing really significant, but it can be annoying.

@matthewac3500 2 года назад

The saw will run rich when you mix too much oil, it will cause issues, it will start to bog down and then get to a point of not starting because the spark arrestor gets clogged. The spark arrestor is the screen in the muffler.

@rickowens4397 3 года назад

Diagnostic first steps for a chain saw... #1 ... Check that the chain brake is released. #2 ... Check if there is mixed fuel in the tank. #3 ... Check if there is bar oil. #4 ...Check for compression #5 ... Check for spark.

@ianbutler1983 3 года назад

#6...Check to see if owner is a moron.

@EliminatorPerformance 3 года назад

Those muffler clips could take an eye out lol

@anonymoususer6448 2 года назад

I was waiting for Dave's 1mio$ question: "where do we go from here" Great to see the Master and the other Master in discussion

@beginnerbluester 3 года назад

Great video: my question is would you recommend pulling the exhaust on a saw you are looking at buying second hand? To see how well it has been treated? Thanks

@donyboy73 3 года назад

absolutely, check out my vid on that subject ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-MRVMeU3ppAc.html

@ENDERTON2000 2 года назад

if they want to sell it, I'm pulling the muffler. otherwise $10-$20 is all I'd pay REGARDLESS

@stevejerebic9072 4 месяца назад

It’s time to give Dave a raise!

@milltek2 3 года назад

That was a great video DonnyBoy! Interesting how a consumer mistake can kill a brand new saw just as if it was ten years old. It'll be interesting to see how it turns out. Glad lockdown is over!!

@DavesSmallEngines 3 года назад

Stay tuned for my fix video and then a follow up test here on Dons channel!

@qcwallace 3 года назад

Why lying to the guy you pay by the hour to solve a problem... the bill will just be higher... But i'm not surprised, i've seen it an all kind of industries. Nice video again, thanks for sharing your experience!

@moocow6350 3 года назад

I knew that one without owning or operating a chain saw before.

@DavidBergman1776 3 года назад

One thing I would love to see is the difference in compression between decomp in vs decomp out.

@gardenfork 3 года назад

Great story and rapport between you both! Could you Put Dave’s RU-vid channel in the End Cards so more people can find him? 😀 Eric

@donyboy73 3 года назад

link in description

@DavesSmallEngines 3 года назад

Thanks GardenFork!

@georgewagner8397 3 года назад

A new saw not taken back to the dealer indicates they did something wrong to the saw.

@mconnorsc 3 года назад

Couple years ago saw a similar story at local small-engine repair shop. Only difference, they filled fuel tank with bar oil. It smoked like crazy when shop drained tank and added proper mixed fuel.

@Brad55102 3 года назад

So they brought it back to the dealer for warranty and got sent away. That's how a brand new saw ended up at ur shop.

@donyboy73 3 года назад

yes

@DavesSmallEngines 3 года назад

And now I’m going to fix it!

@X737_ 3 года назад

I knew straight away what the issue was. Lent a saw to someone with the same result once...

@rjl7765 3 года назад

That is the first question I would have asked, why not take it back to where you bought it if it's brand new.

@andybecker2693 3 года назад

The fact that it was not taken back to the dealer immediately told me that the piston/cylinder was scored along with it being the first tank of gas. I can’t believe someone would buy a pro saw and not know how to mix fuel. That saw is $600 USD and $800 CAN. OEM piston and cylinder is probably half the value of the saw. Time for aftermarket parts!

@michaelfunk5951 2 года назад

I like your teaching approach. You've got a good apprentice too.

@johnkosheluk1041 3 года назад

Someone was in there it is scratched the plugs

@joemancini8376 2 года назад

I haven’t finished the video yet but the first thing that comes to mind is using regular gas instead of mixed. Had someone do this and try to get it fixed where I work haha

@coombsnationproductions890 3 года назад

If you can’t remember to use mixed gas, you don’t deserve to own a awesome saw like that lol

@DavesSmallEngines 3 года назад

Some people make mistakes!

@scooterdogg7580 3 года назад

had to scroll down before I guessed lol as suspected

@DavesSmallEngines 3 года назад

@@scooterdogg7580 yes sir!

@hanginwithj 2 года назад

What an awesome attitude Dave! Don seems like a great teacher! Subscribed!

@briansd6869 3 года назад

not having a single scratch in it after 3/4 of a tank of gas being used is a red flag.

@user-nh3gu1ge3d 3 года назад

Sorry, can you explain what this means? Thank you.

@andersons167 2 года назад

All your videos are great and very in depth and helpful!

@benrobles752 3 года назад

Bruce Pender would say "They ran straight ethyl in this saw".

@bjjohnston2868 2 года назад

Dave's a lucky guy having you as a mentor.

@Cautionary_Tale_Harris 3 года назад

They are fortunate the saw quit running before they hurt themselves. This model is WAY too large for someone with no experience to be using.

@redeemedheathen Год назад

That's a tough lesson to learn, but i bet that owner will never forget to mix his fuel again,.... hopefully:)

@24BLUEELMO 3 года назад

First thing I would check is the gas . Then take the exhaust out and check for scoring .and proper piston assembly

@joerife9691 3 года назад

Back in the 1970s I bought a McCullough chain saw. Ran a can of gasoline through it, probably a gallon of gas. The saw wouldn't start just like this one. Took it back to the store for the warranty. Bought exactly another one . Ran a half can of gas this time. Same thing happened as first. Wouldn't start. There was marks on the piston and walls seen thru the sparkplug hole. Now the the store had 2 saws with the same problem. Information came back from the factory, they had metal filings in the assembly process. They thought it was a gasoline problem also.

@abhitchc1106 3 года назад

Looks like you have a good apprentice there. I own a small engine shop, and while I can find young guys who are eager to learn, they are also prideful, and don’t seem to want to take my advice. I can train them, but it just takes that much longer. Having someone humble would be far better. Looks like you got a good one. Don, thank you for the video. My question to you, and you may not be willing to answer, is what next? I have these types of issues walk into my shop periodically. I tell the customer that their saw is trashed, and they need a new piston, ring, and possibly new cylinder as well. On these newer saws, especially something like that MS 261, aftermarket parts can be difficult to find. What to tell the customer? I guess they really don’t have any choice but to buy new OEM parts or put their saw in the dumpster.

@donyboy73 3 года назад

he's a good one for sure, very hard to find!

@DavesSmallEngines 3 года назад

Thanks for the kind words! I am passionate about small engines and mechanics in general, so naturally learning from the master was an easy decision! I'm a lucky guy!

@gigiraymond9267 3 года назад

It is obvious those guy's know nothing about two stroke engines where you must mix the oil in the fuel so the engine can properly be lubricated . That is why it is very important to alway's read the owners manuel , especially if you have never owned that type of power equipment . Thank you Gentlemen for the video .

@DavesSmallEngines 3 года назад

You’re welcome!

@nathanfischer4132 2 года назад

I had rebuilt a ms290 and yes like you said it is a pain in the ass I’m only 15 and I love doing this stuff the saw runs great I just need to port it and it would run better but still runs like new neighbor put straight gas in it didn’t tell me that’s the first thing I looked at because it had almost no compression but I figured it out and got her back up and running that’s all that matters

@abnormaltexan 3 года назад

I worked on motorcycles and atvs for 20 years. I have seen customers do some absolutely insane things to try to cover their tracks! Especially when its under warranty and they wanted to get it fixed for free! One customer put his new oil filter in backwards and crushed it and almost roasted his top end when he cranked it up. To try to get us to check it over for free he put his old oil filter back in backwards to crush it on purpose and told us that’s the way it came out so that’s why he put his new one in that way and we did the first service so he was just doing it the way we did! I informed him that he wouldn’t have made it to the end of our driveway before his head would have roAsted. The filter in backwards would have blocked all oil from going to the top end. I also informed him I’m not an idiot and he could have tried a little harder to come up with a better story!

@wland8549 3 года назад

Just as you were telling Dave to turn the lights off for so we could see the spark, the light came on for me - straight gassed it! Swear to God! Hysterical!😂 Nice job guys! 13% sales tax, ouch!

@DavesSmallEngines 3 года назад

Big ouch!

@stevec541 Год назад

Love this format. Investigating like this, absolutely helps with troubleshooting. Hope you do more like this. On Stihl chainsaws. Because all other brands are garbage. Lol😜

@Mocking69 2 года назад

The chainsaw that can cut wood is wonderful ♪

@mrsock3380 2 года назад

First thing to do is check if there's fuel in the tank, I had a friend drive half an hour to my place for a saw with no fuel.

@davemarks7322 3 года назад

Well done vid, and to your apprentice I wish the best of fortune. He seems to have the right ingredients to do well. As they say, never take anything for granted.

@DavesSmallEngines 3 года назад

Thanks Dave!!!

@brianeastman3547 Год назад

The Red Armor 2 cycle engine oil is the best for your Stihl chainsaw,it prevents scoring your piston, Keep up the good work man.

@tombeckett4340 2 года назад

I think Dave nailed it a A would be in order. Thanks 🇨🇦👍

@peterlabiak1051 2 года назад

The Holy Trinity of Compression Spark & Fuel is the prerequisite of course. I however have a lawnmower engine which does have all of that but still doesn't work. Now, what do I do to figure it out and what can be the cause? The answer is leak down test, which will confirm your piston rings leaking. With 4-strokes you cannot see cylinder bore that well (unless you have a bore scope) but if it is really "shiny" it confirms the piston rings are worn and do not allow for the combustion pressure to build. Now, how do you get a decent compression test reading the you might ask? The whole system becomes pressurised after few pulls and your compression tester shows decent compression.

@thomasdempsey8011 3 года назад

I run all my stuff out of fuel at the end of the season I don't use stabilizer and start every season with fresh fuel I mix myself I learned this from a small engine buddy of mine and it works every time

@jameslund221 3 года назад

Don, seams like such a patient teacher.

@davidsprocket5141 3 года назад

Just a thought check the bar oil tank could have blue 2 stroke oil in it!

@erwinpierce1136 3 года назад

Great job Dave , youre learning pretty fast . And a great job to Don for being such a good teacher to you .

@DavesSmallEngines 3 года назад

I’m lucky for sure!

@Michel-Artois 2 года назад

Well Dony , compression test was not so good, even with decompressor closed. But first of all , the plug was not brown...but grey with metal dust on it (never seen that before)... What a pity for a new saw! It was clear that piston, rings and perhaps cylinder were damaged and impulsion lost. Confirmed with muffler out . First try and forgot oil? Perhaps cold start with full throttle and no precaution with a new machine , but mix too poor and H too poor screwed with very high turns.?.. With a very new saw I always begin with 35/1 with synthetic oil , H just a little rich , and I let the saw smoke and work quietly . Priority to perfect fatty sliding between piston, rings and cylinder. Greetings from France Michel

@JboBakey 2 года назад

I don't work on small engines, let alone any engines at all. But I had a strong first hunch on the fuel mix from the beginning

@gavmansworkshop5624 Год назад

I had a ms660 come back to me completely locked up. What sucked here was that was my saw and the tree guy who borrowed it "definitely put proper mix in there" and I said well that's why the piston looks like a fogs breakfast eh? You looked after it that well it just couldn't handle the good life.

@hueykimlin4958 3 года назад

I was wrong when I did my diagnosis by the video title. I was thinking piston ring failure due to over heating due to max load at max speed due to it being a new toy. Thanks Huey .

@lesscoRyden 3 года назад

So i have a MS 171. We had a bit of a brain fart and i forgot to strap it down to the back of the tractor where i normally stow it. Then i noticed a thud as I was moving across my property. Yes it was my new saw falling off the back and being ran over by the trailer i was pulling. I freaked out, picked it up and pulled it to start it. Started right up on the first pull but sounded a little off. Kind of a whining sound coming from it. upon further inspection i noticed i had cracked the tank housing and busted the trigger handle. So i got online and found the new tank housing and trigger grip. After the new parts came in i very carefully went to disassembling then reassembling the saw. I took my time taking pictures and notes as i took it apart. After about 4-5 hours of very slowly making the repairs I got everything back together in a way that i felt confident was correct. I gave it one pull one full choke and it started for about a second before stalling out, which is normal. Moved it to half choke and gave it another pull. Nothing, pulled again. nothing, third pull started up and went to high revs as you would expect on a half choked saw. pulled the trigger to put it in the run position and it kinda bogged down on me, pulled the trigger to about half way and it died. Gave it a few more pulls and it started a third time. pulled the trigger and died again. So i pulled the cover off and noticed there was fuel/ oil on the air filter up against the carb. At that point i knew something was wrong but haven't the slightest clue where to start or what it could be. If anyone has any ideas or tips to help get me pointed in the right direction i would greatly appreciate it. Great channel, btw I find the content very informative.

@donyboy73 3 года назад

I would have to physically see you saw

@DavesSmallEngines 3 года назад

@@donyboy73 Don you should start doing virtual diagnoses! Maybe some good video ideas for us in the future? Live diagnoses!

@donyboy73 3 года назад

@@DavesSmallEngines yes and I would really be putting on the pressure!

@MMOverlandAdventures Год назад

Troubleshoot this brand new ms271 bought yesterday. Bomgaars put the premium Stihl premixed fuel and bar oil in it. Took it in the back and said they started it. I was in the store but did NOT hear a chainsaw start. I have not be able to get it started today, so far. Will keep trying but if I don't get her started today guess where I am going tomorrow?