I'm no expert on chainsaws nor 2cyl engines. With that said I am a heavy diesel mechanic with about thirty years in the trade. I have worked on CAT, CUMMINGS, DETROIT, MACK and etc. The old 671 DETROIT is a 2cyl engine but far different than a gas 2cyl. In a gas 2cyl you add oil to the gas to lubricate the internal parts of the engine and the design of the muffler is to maintain a certain back pressure to help lubricate the internal parts of the engine. ( piston/rod needle bearing ) In a competition chainsaws with special header muffler those saw are only built for that competition; then rebuild for the next comp. And the little screen is a spark arrestor! Smokey the 🐻 doesn't like forest fires!!! I have a chainsaw that's cut 8 to 10 cords of firewood for fourty years and this still strong!!!

Finally we get to see a cs-590/600/620 muffler cut open!! Awesome video!!

I had a friend of mine laser cut around the center tubes for the top bolts. I then cut about 1/2" past the factory seam on the front side. I then used a step bit and bored out big holes on both sides of the center tube. I left the center tube alone and did not alter. As he has stated the metal is thin and welding would be difficult. I brazed the body back together. I used bronze brazing rods that has the flux on the outside. I want the muffler body as an expansion chamber. To gut one as much as this I feel you may has well just take it off, and just install a strait pipe with 2 90's. Maybe this is they way to go on a heavy modified saw. I have light mods, and feel the engineers knew what they were doing. I simply open up what had to be there to make it complaint.

The CS-590 is definitely an awesome saw for the price! I did muffler mod mine, well beyond just the deflector and it was an improvement. Not huge but noticeable. Base gasket delete was also a worthwhile mod IMO. My 590 really woke up when I built it an Ironhorse style pipe! If you have the tools and ability to make it a pipe, I'd definitely recommend that over modding that horrible can they come with😅

I ordered my 620pw today. Thank you for this video, dude.. Gonna leave the factory can stock just in case I need a warranty claim over a legit defect and build an ironhorse or something..

Congratulations on being a grandfather. Its a fun ride

I can’t wait to see a proper muffler mod on this. I’ve been wanting to do one but that muffler is ridiculous. I couldn’t figure out how to open it up either.

Those mufflers are furnace brazed. Not easy to take apart. One of the harder mufflers to modify if you want it to look right. I’m dealing with the same on my CS-600P.

New subscriber really enjoy these videos

My 590 is down, so I bought a 680. I think I got a chainsaw addiction. Did I really need the 680, I have a cs8000 & a 7310. The 8000 is ported & 7310 is stock. I think I love the manual oiler.

Please video the carb high jet bypass plug when you do it.

Get the sheep more in the show !! 🐑

It's so Bizarre how complicated they make some of those mufflers....makes you wonder if its just to detune them so they last longer?

I know a guy in Iowa thats gonna put a iron horse muffler mod on mine and tune it for me. I can't wait, they look nice with that one pipe coming out of the muffler. I think it's called a iron horse muffler. It's wicked looking and helps it alot. I'm new to using saws but I want my new Timberwolf modded

All echos are choked up Especially the cs400 I just cut out the top of the outlet and then weld a 3/4" pipe in the front of it

Thanks for showing that, next time I've got mine opened-up I'm gonna need to re-examine *HOW* I've opened-up my baffle-wall's holes (there's obviously a bunch of increased flow-through needed IF your mod did not penetrate that rear-half, and mine - and NO good mod IMO - should ever penetrate the walls of that back-half, it'd allow atmosphere into the back half which means it'd mix with the gas&charge ending up with non-zero amount of atmosphere in your combustion chamber, that is objective fact not speculation) Seeing you've got some extra muffs I hope you get a chance to try what I'm suggesting, simply ignore that tube (you don't gotta remove it just put a plate over that entire top exit area and block it off),ensure the muffler's entry and the heatshield-gasket are port-matched to your flange (over-match when in doubt), enlarge the baffles' pass-through, and then put your exit(s) on the front-half's wall (ideally higher up, ideally NOT in-path with any of the baffle pass-throughs....IDEALLY the gas wouldn't have a direct path, and the path itself *must* be large-enough to accommodate higher throughput usually 60-70% of exhaust-flange-area is used as optimal muffler-exit sizing), of course this presumes no choke-points in-between there and the flange, and a muffler with more baffles/pathways (whether a 590 or a 2511 where the gas travels across the rear of the muff, into the front, across the front and out the front's opposite side, ingeniuous way of lengthening the tract my Echo there!!), on something like the 660 muffler where it's all open I like an exit more like 55-65% of my flange but that's a 1-portion muffler so movement inside is quicker and it'd dump too-much if making a hole, proportionally, as big as that on a 590 muffler (or my 2511t muffler) Wanted to slip this in where few/anyone will notice it but from 1 dude to another, you mentioned your hair...I do an at-home buzz cut dealie, leaving the top a bit longer, generally don't care--- I'm gonna be honest with you in the manner of telling a friend they've got something between their teeth-- I dislike fashion/aesthetic focuses but sadly do have some base knowledge in that area and cannot recommend to you enough to reevaluate your hairstyle, specifically that lengthy curly top/front over the tight sides, unless it's a sentimental thing (military friends or some such thing) will be honest & tell you the style isn't working at all for you / your face, it looks like you should have a dress shirt on or something, doesn't match with being in the garage nor a guy who eminates that IE 'real men' for lack of a better term...I'm probably only aware of this because I did something near-identical to my hair through highschool&college (all the other wrestlers did, too) and continued it into my late 20's when someone gave me this talk/advice, and I looked around at others' & my own hair, and quickly made the appropriate change to simplify/normalize it LOL!! But like I said for all I know that's how you & "the old crew" still all do it & if so then more power to you, only mentioning it since you brought it up & it's, oddly, the 1 "manscaping" area I feel I could offer anything of value in (nevermind how much simpler it is w/ less hair there, you'd love it, stuff is such a PITB) I'll make a video of my 590 muffler if the description didn't suffice, I'm pretty confident the approach is the best you can do on an OEM (still uncertain on exact #'s though IE an exit hole of 60%flange, or 63%? etc), can always do small-pipe (ironclaw/bearclaw muffler type) but those as a principle are still very much in their infancy so you'd be "helping beta-test" as much as helping yourself (so *I* would encourage you that way, lol, but for my own interest in seeing your results- personally I'm very eager to make one, but cannot because I've yet to see a design I'd say "nailed it", some are getting very close Buckin Billy Ray has one that is, IMO, nearing the right/optima path!!

Make an expansion chamber pipe, like they have on competition chainsaws.

The 4910 muffler I believe was designed to be opened and have everything taken out. It’s the easiest muffler mod in the chainsaw industry.

Man I hope you go crazy with the saw, love my 590 and would look forward to see your mods!

I wish somebody would start building muffs for this saw. Id love to buy one.

The ECHO saws are getting my attention along with the clones. Just can't afford any of the others 👍🆙BigGuy

Try taking a large step bit and drilling out guide tubes where they go through the baffle plate . And doing the same thing to that large diagonal tube going down through the muffler . Maybe it's assembled from front to back and not back to front . Like for example if you would have cut it on the other side of the seam . Maybe it would have came apart better ? I realy have no idea just thinking out loud

I am a new subscriber. Love your information. You always tell it like it really is, right to the point. No bullshit! Being a chain saw mechanic myself 44 years. This video is great. STIHL makes some great saws, BUT! It is not a saw of my choice. Highly overrated, and marketing is there number one weapon. Yes, the 590 ECHO is a great saw and many others in its class. Will be watching many more of your videos Novice Lumberjack. Love your channel.

My 268xp muffler is like that. I just drilled a bunch of holes in it. Id like to make a pipe for it

I cut the bottom open and clean them out then seal em back up. Then I close up the factory outlet and add 1 or 2 ports in the corner. THEY SUCK!!

Hi good night😊

They limit them so hard because of a 5 year warranty

Boedy Boedy Boedy, what am I going to do with you man? (Rhetorical question.) All of the bigger Echo's (Echoes?) use the D176 bar mount pattern except for the CS-7320P just like the Poulan Counter-Vibes and older, the McCulloch 10-10 and up to the 82 cc saws, and Tanaka saws. The smaller Husqvarna bar mount pattern is the K095 and the bigger Husqvarna bar mount pattern is the D009, you can modify the D009 to fit.

Is that the same muffler on 620??

I made a mod video on my KZfaq channel for these 590s check it out. Your right what a pain in the rear they are. Easy quick mod that I made. It could be done “better” but for quick and easy it’s great and helped performance!

Welcome to epa regulations

ST zacharie Quebec Canada

Its probly silver welded like stump grinder teeth

4:10 is it a bird??

The comments you keep making about us on west coast and dugles fur wood. Maybe you should try burning some before you say it's not a good quality fire wood. Out here in the west it's preferred because, it's clean burning, put out good heat, and burn all night.

Why do they make the muffler so restricted? You know it robs power and guys are going to be making mods anyway. Be nice if it came open from factory like older saws were built. I had an old Sears that just had a deflector. Man that sucker was loud.

Conan ain’t got nothing on you😅

That muffler sucks bad!

It's a Box Store saw!......that's the reality. These are NOT pro level saws....meaning they are not designed with "modding" in mind.........or Not designed for major service in the field like Pro level stuff. If you want to mod things, buy an older Saw, or PRO grade saw.

TA Daaaa!!! I found one for $100!! Not quite as nice as yours, but still plenty good. Tree company closed and was getting rid of several. Now- dare I try porting it?? I know tinman has had difficulty doing so Also- if you think those are bad mufflers, you should see a cs400. I have a quick bypass for the muffler mod. Text me and I'll send you a picture.