Chainsaw Decompression Valve Replacement - DIY

[@donvoll2580]

Good day Don Boy that was interesting, as we get older, things seem to get harder or heavier. Thanks

[@sistakee1090]

You make small engines understandable!

[@brianwickham9979]

Very good commentary and filming 9.9/10

[@sarto7bellys]

Your videos are really interesting and informative and everything you do is carefully explained, I cannot for the life of me, understand why people give you a thumb down, keep them coming Don, I have leaned a lot from watching your vids and from others like yourself, atb from England

[@fillslawncare]

What kind of lavier mic do you use Don?

[@nashguy207]

Thanks for the info Donyboy. Looks like a simple repair. Hope you wife is doing well. Have a great weekend!

[@BrucesShop]

You always have good advice Don. Air washing before you start. I got the term "air wash" from you years ago. Thanks

[@DavesSmallEngines]

Awesome Don! Clear and concise. Great video!!!

[@donyboy73]

thanks Dave!

[@PaulLeMay3218]

Thank you for sharing this procedure. 🇨🇦❤️

[@jimmytwinsburg4734]

Another very well presented video. You have a lot of videos on Stihl chainsaws, several of them included the models of the saws I have which makes in very informative for me because you actually show the exact same model saws I have. Your videos are well explained and illustrated and you present them so they are easily understood . Keep up the excellent work, we appreciate your help !

[@seanmcgillicuddy956]

Hmmm another 261 ...Great video as usual ..Thanks

[@chuckuu9294]

Thanks Dony you just made my repairs easies.

[@muddy1ish]

I want to delete mine stihl 036 Pro you which plug?

[@garrytalley8009]

Have you ever encountered a decompression valve that would kick closed too easily and make it hard to pull as though it had a plug in it? I just purchased a new chain saw of 92cc that seems to do just that and I have not been able to get it to turn over enough to start it. Just get to start a pull and before it even goes a stroke it closes and then the rope just gets pulled from my hand when it closes prematurely.

[@ronwatson4902]

Another good one Don. Love the Stihl shirt too.Thanks and have a great weekend.

[@EliminatorPerformance]

Super simple step by step!

[@donyboy73]

thanks Jake, have a great weekend!

[@shermankearns200]

Are all of the decompression valves the same size same model or do they vary depending upon the size of the top end. I cleaned up an AV 050 that I bought at a yard sale for 5 bucks in the mid 80s. I pulled the head off and the piston looked brand new but it wouldn't run . It had spark so I took the carburetor off and bought a one gallon can of safety clean and some gasket materials and red Hi Teck gasket spray. I soaked the carburetor for a week cleaned the jets and blew all of the small idle circuits out with compressed air. I reassembled it all and Set the screws back 1 and 1/2 turns each just to get me started. It ran beautiful after a little jet adjustment. My friend had warned me to use the compression release every time I pulled that saw or I would be sorry. So naturally I did not listen. It started backwards and now my right arm drags on the ground just like 3rd from the left Neanderthal Man. Lolol Never take the valve out of a big saw. I learned my lesson the hard way.

[@analog1229]

I had trouble with the high compression on my 660 popping the valve up before it fired, the solution was to carefully open up the hole with a drill bit

[@fearghalmorrissey2601]

@@analog1229 Nice tip I must give that a try I have two saws 45cc but have high compression and popping the valve half way through pulling the starter rope

[@CALVINLNIKONT]

Thanks for the detailed explanation.

[@johnclarke6647]

I replaced the deco valve on my new Husqvarna 372 kit saw the other day because it was leaking like a sieve. It had unturned fuel all over the cylinder. I spin them off with a socket and my impact wrench. I screw them in by hand and tighten them down with my impact wrench. Just a couple of raps are sufficient. I put a new Husky oem deco valve on my 372. It no longer leaks and starts easier. I also cleaned up the fins on my cylinder caused by the leaking old deco valve.

[@DwightRorie]

Nice and easy to follow along.

[@bobmcl2406]

More good info. Thanks Dony. I have only worked on a few (mostly 35cc and smaller) chainsaws so far, and I don't think I have come across a decompression valve. How common are they? Certain brands?

[@danclas5983]

Thanks for another good video Don. You may not know it but you are responsible for training me for my future retirement job as my local Ace Hardware stores chief Sthil guy LOL. They don't know it yet either. Thanks.

[@semco72057]

I have a Stihl 250 chainsaw and it don't have that compression valve on it, but I understand what you are talking about and this video will help those with the valve on their saws.

[@samdaly3247]

Can an older saw that does not have the valve be modified to add the valve?

[@williamhartsell6390]

Is that a washer on the decomp plug?

[@tyroneclarke1666]

Thank you for the info Don 👍.

[@lapetitetrotte]

Very useful. Love your channel! Thanks.

[@mattmidili4350]

Having some oily residue around that decomp area any concern?

[@thomasbeaver4896]

Does stihl ms250 have valve ? Where would that be and if not what else could make the pulley hard with compression?

[@richarddodds9326]

I just put a new one in a neotec 92 cc the thing wouldn't stay open but the new one exit hole is too small so I got to get a small bit to make the hole bigger the plastic recoil starter won't last long if I don't

[@YukonHawk1]

I really need to buy a Stihl. My Craftsman of ten years is still running great. Stihl saws are so much easier to maintain

[@shsechas]

I have a Craftsman as well. Works well for years. I don't remember is the Craftsman has a Decompression Valve. I also don't use that often and only put in PreMix 50 to 1 gas.

[@YukonHawk1]

@@shsechas same here. I guess when you come down to it most chainsaws are easy to maintain. I just checked mine. No decom valve.

[@DaveBennett]

Thanks! I wondered how that worked.

[@petefranco5919]

Does a weed eater have that same valve ? I have used mine and when I use mine when I turn it off for some reason it’s super hard to start again until it cools off for a while seems there’s to much pressure in the piston. ? By the way Great diy videos 👍

[@thomasbeaver4896]

Does stihl ms250 chainsaw have decompress valve

[@ttttwwyu]

Don, is it true, according to your experience, that not using the decompression valve on a saw that has one, can with time damage or break the pull start mechanism? Thanks

[@donyboy73]

yes it will wear it out much quicker especially on bigger saws

[@luismontoya5189]

Bbjj

[@dannyhullihen966]

Donny. How difficult would it be to install a decompression valve on a unit that doesn't have one? I have two 52cc units ( a Badger, and a Maxtra) that is almost impossible to start because of the really high compression.

[@TheCrittercam001]

That's a very good question. I would imagine if you have a good drill bit and the proper tap and die tools along with creating a spot on your cylinder cover for access to the valve that it could be done. But that's just my opinion.

[@dannyhullihen966]

@@TheCrittercam001 I think it would be possible, and definitely a good thing! If I can figure out exactly where to drill and tap the cylinder head, I'm going to give it a try. As I said, it's almost impossible to start like it is now. So much so, that I am very reluctant to get it out and use it! They both only have about two hours of running time on them.

[@andrewgilblom1741]

I'm getting liquid around my compression valve, my saw won't start, it's a newer still, could this be the problem? Thank you Sir.

[@johnnellis3025]

Is it possible to drill ,tap a chainsaw that has the place for it? My husqvarna rancher is hard starting and they come without one. I don't use it much, and i'm getting older, so it's getting harder to start. Any thoughts? Your the best Donyboy! Great Info.

[@rickforsty9410]

I like the way you guide people through the replacement process. And the option of a a plug for those who have good arm strength. Good job.

[@garrettstevensen2467]

Crazy. I have a Husqvarna 560 Rancher and it comes with a decomp valve.

[@GmGarlo]

is it hard to add a decompression valve to a chainsaw ? because my 55 rancher has a place where you can put one . never saw anyone make a video on that ; would be nice to see ! does some saws come with an option if you want to put one in?

[@adnacraigo6590]

Wish my old ss77 husky saw had that feature.

[@jeremybrain5774]

Thanks for sharing Don

[@metheewatchakittikorn4796]

Thank you so much.

[@sergioszczuczko6958]

Good video dony

[@snort455]

you said Stihl genuine part. I request a video about the benefits of genuine OEM parts.

[@mscir]

Nice work.

[@jamesespenitra2429]

How to replacing the compression valve of Stihl 070 chainsaw

[@henerker]

I often try not to use that decompression valve. It can lead to flooding of the cylinder with excess fuel if used too frequently when starting the chainsaw when it’s cold.

[@bl9531]

FYI, the compression valve on my MS441 was bent so I ordered a new one. When I went to install it, I was unable to get my long ratchet around the nut of the valve because the stem was too crooked. As I was attempting to access the nut by straightening the valve stem using the long ratchet, I realized the stem was now straight enough that it would no longer be necessary to change it

[@CarlJohnson-ry3gc]

THANK you.

[@rondean2009]

Good job ! well done Thank you . . .

[@fernandoseverinoSVS]

Muito bom! Eu tenho a MS381 que possui esta válvula também.

[@scottmcmasters8005]

Good evening sir, I have a question about something totally unrelated to this video. Sorry about that but I'm in a jam. You're the only one I can turn to at the moment so here goes: I recently purchased a stihl 020avp used from a stranger. A really good deal. I don't think he knew what he had at the time and for that matter I didn't either. I almost passed it up but it was a cute little saw and I needed something a little more compact. After tearing it apart and and giving it a thorough cleaning and replacing the fuel lines and filter to my amazement and delight it started right up. But the silly thing just winds up and will not idle down. I've tried adjusting the carburetor to no avail. I don't know what to do. I need you to expertise and wisdom. Please tell me it's something easy that I can do myself. I don't want to take it the high dollar shop we have in this small town .

[@edwingroening5087]

I had something similar. Found out the intake boot was half off from the cylinder. Massive air leak Your problem may very🙂

[@garyeager6460]

Can you install a decompression valve on a ms291, drill and tap. This saw does not have one. Has anyone done this. Thank you

[@hlanceboyd]

why does my decom valve kick out each time I pull the cord. The engine does not seem to be firing? this just started happening, had no problem 5=6 months ago which is last time I used it. I drained the fuel and put new fuel in, plus cleaned the carb. Next gonna check the spark plug

[@dab.]

I have this exact problem, did you fix it?

[@thomasfrost6993]

Have you ever used any "no brand" valves?

[@robertchall8576]

I didn't know that great tip.

[@tonym6920]

thanks Dony, 👍👍

[@balazsmark819]

Hello, I have an ms 241 c (4 years old), the problem is that when the chainsaw gets hot it’s really hard to start, it takes 5-7 pulls to start, but obviously a fairly new Stihl saw should start from one pull when it’s hot. I have no idea what is the problem, I changed the spark plug, every filter, reseted the m tronic but nothing worked, please if somebody knows what can be the source of this problem please help, this problem is really annoying. I was wondering if the decompression valve is the problem 🤔

[@999thenewman]

Good video. Though it isnt difficult to start a chainsaw full-force if it's in good condition. It isn't like you're two-handing the pull rope with your legs bolstered to start a K-series Kohler.

[@dannyhullihen966]

On the contrary, on some engines it is like that!

[@999thenewman]

@@dannyhullihen966 Yes, but not needed on worn out chainssws. That can actually prevent it from starting and running.

[@fire7765]

Good job

[@jensenwilliam5434]

Thank you!!

[@denisthemenace.]

With saws under 90 cc, get rid of the decomp. It is only something else to fail

[@donpizzo8963]

That's what I'm thinking. If it's that easy to damage you have loss of compression and another route for dirt in the cylinder.

[@em4703]

And then you'll have the arms engaging the flywheel fail faster, or the string holder. These decomp issues are incredibly rare, why stress over it and willingly create other issues. It's not about your arm or shoulder, as even high compression saws are easy to start without one if you crank with a snap. It's about the starting mechanism that these things protect.

[@em4703]

@@donpizzo8963 Nothing goes in there, it's a tiny hole. You're not sucking in anything. It's like worrying that dust gets inside your engine every time the exhaust opens during the stroke lol.

[@mrodriguez5259]

Magnific 👌

[@vanderpoolfarmsl.l.c.9983]

Can't believe air can actually flow through that dirty air filter.

[@timberray9572]

I replace all my decomps with plugs, problem solved.

[@em4703]

And then you create another problem by wearing out the plastic arms that engage the flywheel or the rope holder. Just use an OEM decompressor and have at it, they're cheap to replace, IF they ever need a replacement, never had to do that or know anyone having issues. The horror stories of it falling inside the engine are as rare as a con rod randomly breaking.

[@HuyPham-ps1uf]

What' what'

[@jas350]

Love chanel but me say again and again STIHL produckts junk, all your videos are on stihl products because they are junk. Again me have all homelite products and never proplems . Me have homelite for 15-20yr no proplems.

[@Logan-fs5wg]

If you are not a tree climber and have a strong arm just plug that hole and get rid of it. If you got shoulder problems and prefer an easy start go ahead and keep that thing on there. It’s all preference there is no right or wrong answers my friends.

[@awayyanna945]

Thank you 🙏👍👍