What do you think is wrong with this Saw? Stihl MS391

[@bryanmcgovern7858]

Well since the owner doesn't know how to put a chain on he probably doest know to mix fuel correctly. Whenever I work on something or buy a used saw/blower etc the first thing I do is drain the fuel and put mine in and a lot of times that's what it is.

[@Adrians_Adventures]

He was telling me about his fuel mixing procedure and I don’t believe that was the problem. Replacing gas is a good practice. You’re exactly right. Often the problem is stale fuel.

[@alexcarr8503]

I would say your buddy is putting a lot of pressure on the saw to get it to cut. This is causing the bleuing on the top and bottom of both sides. It takes time and experience to know when to stop and sharpen the saw. Instead if pushing harder. Experienced saw operators never see this on their bars.

[@stevenmiddagh6265]

I had a 391 couple years ago, during the time i had it the carb was replaced twice. Stihl had no idea why the carb had to be replaced that many times .

[@carolgossel4050]

On the Low and High carb screws turn them in till they stop. Give both screws one and half turns out. It will fire up and run. Then set from there. I heard it bog and thats a carb screw on the Low side adjustment. Also a bad crank seal can cause this. I seen that bar and heat can transfer up to the crank seal. And ruin the crank seal in time. Also over tightening chain puts a alot of stress on that crank seal. I have also seen sawdust in the carb on saws cause don't pull the winter filter off and install the summer filter back on.

[@Rockjock007]

The blueing is not from overheating, over tightening or lack of oil. It is from the heat treating from the factory. The issue was operator error. Summer/winter flap will not give you starting issues. 271,291,391 rock solid saws.

[@davidschliebe246]

Correct....and also Even with a new file. Good luck trying to file heat treated steel.

[@prepperboss]

Bro, excellent video, but turn your phone to landscape mode so we can see the whole wide angle of your picture frame

[@Adrians_Adventures]

Thanks! It was originally gonna be just a short, that’s why the camera was turned that way.

[@madeljacky]

Its going not too bad now but it sounds like the low and high needle on the carb needs a very small adjustment, you can hear it bog down slightly, ive owned McCulloch, Alpina, Makita, Dolmar and Stihl saws over the years, id say Stihl is the best ive ever owned

[@FrenchFarmhouseDiaries]

He just doesn't know how to use it period

[@jeremyfortune7274]

It’s a 391.. that’s what’s wrong with it. For some reason the Stihl fan boys hate them, I’ve never owned one.. Plus your friend doesn’t seem to be the kind of guy that needs a chainsaw. He’s gonna hurt himself..,

[@iffykidmn8170]

Why would anyone want to blow the crud and grit towards the roller tip.maybe the customer should ask KZbin?s

[@Adrians_Adventures]

I would normally blow away from the roller. Off camera I had pulled a pick through, so there wasn’t much there anyway, but good eye. You’re right, go the opposite direction.

[@jaydenhall187]

No ear pro, running a chainsaw inside?

[@Adrians_Adventures]

I know it’s not great, but it was only for a moment, and we did it in a well-ventilated space.

[@200cdl]

The Price ?

[@Adrians_Adventures]

Stihl does seem kind of proud of their prices sometimes, don’t they?

[@scottmiles3362]

So if you have spark… ignition module and spark plug are good….. what’s the next steps to get it running? I hate these models

[@Adrians_Adventures]

Check compression with a gauge and mixture.

[@BillDivyak]

I bet your customer was so PO (pissed off) that he just threw it back together. I have a MS 390, a fore runner to the 391. Had the same problems described here. Mine was a complete bag of shit. It would start but after a tank of gas it was a boat anchor. It did not take long to go through the gas, about 15 minutes/tank, it sure liked gas when it did run. Took it back the stihl dealer; $130 later SOS (same old shit). Took it back again, SOS. The dealer told me there was NOTHING wrong with the saw, it was me. I listed the 6 stihls I had owned and worn out without major problems. This was a LEMON and stihl did nothing to help solve the problem. Well I solved it, purchased an Echo and have been very happy since. Will NEVER purchase another product from stihl. Every chance I get I make my feelings/opinion known. This company, stihl, is in decline and pushing shit and PO its base.

[@ALL4SCUBA05]

Wow. I have that same issue with my 391 as well. Tempted to sell it. Tempted to go Echo as well. My smaller Echo is my oldest saw and never gave me problems. My Husky rancher gives me problems as well. Always after a while of cutting. 🤦‍♂️

[@No.15mining]

Just bought the echo cs 4910 haven’t used it yet but it feels like a good saw.

[@eurokid83]

That carb needs to be adjusted. Too lean on the high speed mixture.

[@fhadamsd]

idle doesn't sound too good i would try and adjust the carb that could also explain why it was starting then stopped working

[@Hambonebodi]

391 , Some of those had lots of problems, some didnt have any , but exploding flywheel and leaking / popped port covers, rev limiter going bad in the coil letting it over rev , seem to be the top of the list .

[@scottfoster2487]

Check fuel filter and fire screen ,I would even pull the muffler.

[@Tonnsfabrication]

Those have a glue on port cover and they can come unglued/ break seal then run lean or just not run at all. A real PITA cylinder design right there, if they have running issues you have leak test that one and make sure.

[@shieldwolffalcontrainer9040]

Check his muffler. The 391s have bad muffler to cylinder sealing. The suck back grabs tiny particle saw dust and pulls some into the cylinder. That can mess up the cylinder and piston.

[@Farmall4ever]

The blue on the bar is factory heat treating not chain related, sounds like carb needs gone through, and pull the limiters off

[@blacksmokejoe5827]

Check the flywheel there was a batch of 391's had issues with craked flywheel check them they change the timing as they run get hot expand quit till cool off shrink start again they grenade be safe.

[@Adrians_Adventures]

Thanks for the heads up

[@naturundhund]

Nice Chainsaw Greetings from Germany Peter

[@billyray6913]

Its flooded. Put it on full throttle, set hand brake, crank it up to 30x it will start.

[@danielpadgett2831]

Never blow dirt towards the nose sprocket always clean it away from it

[@Adrians_Adventures]

Good eye

[@charlesfredrick4789]

Ain't got no gas in it!

[@kenturner3268]

UmHm

[@Okinawa1914]

391 ms sthil 👍 morul 710 2t oil 1l / 25 mm

[@williamclements273]

Exacerbates is the word you were looking for; exasperated is what you might feel when you use the wrong word. You're welcome.

[@Adrians_Adventures]

You’re right!

[@RobertWrightjr-nh9eq]

pin hole in fuel line or fuel line gummy from ethonol

[@kenturner3268]

Ethanol was made for drankin.

[@HipaStore]

Awesome chainsaw diagnose and repair video. Are you up for a collaboration? Hipa supplies affordable and good quality chainsaw parts and saw chains and you get the knowledge on chainsaw maintenance and repair. Maybe we could collaborate to share more tips and tricks on chainsaw repair and meanwhile introduce a way that DIYers can get affordable parts in this live cost increasing days.

[@Arab4eva]

Great for building muscles with all that weight. 🤧

[@Adrians_Adventures]

I didn’t think it was that heavy, but my personal saws are bigger than that one.

[@mikevictor3698]

Your buddy should not run a chainsaw . He should hire someone to do the work!

[@tcmits3699]

Main problem is, it's not a Greenworks 16" 40v digipro, brother and father-in-law have Sthl's, they just bought Greenworks. Not even in the same league, just my opinion

[@Adrians_Adventures]

🤣 Electric tools have come a long way from the junk they used to be, but I’ll always have a soft spot for a real engine powered machine.

[@tcmits3699]

@@Adrians_Adventures l agree, l also have a soft spot for my1977 Hercules GS 175 dirt bike. But those 2stroke weed eaters and chainsaws, the word "Frustration" would be an understatement, even my Curtiss-Wright Wankel engined snowmobile is easier to start. Take care, good luck 👍

[@ChippyOutdoors]

Saw chainsaw and subbed I'm in

[@clintjohnson7023]

I just bought that same dam saw. And when they assembled it at ag powers they put the chain on backwards. Which I noticed before I ever used it because I was loosening it it was also to tight. Now even though it's got a compression button. By far this is the hardest starting cold natured saw I've ever owned. I wanted the model 271 which is a great saw

[@aaronspencer7404]

Harsh