Husqvarna 576xp "Introduction" Video, A No Base Gasket Build & Squish Band Explained
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- Опубліковано 17 жов 2024
- Basically took a new Husqvarna 576xp and took out the base gasket to get a little more compression. Did a real time top end removal and replacement and explained what happens when the base gasket is removed to compression and the small changes to port timing resulting from the cylinder being lowered.
As of January 1st 2019, that saw STILL is in commercial use. No issues that I am aware of. Proves the point that build concept done right works and is viable as it has not effected reliability in a meaningful way. PARTLY because of the width of the flange surfaces where the cylinder meets the cases. But one thing I pointed to and edited out (a mistake) was the vertical flange thickness but the front or transfers doesn't give much material to "deck" or turn on a lathe to remove the same .020 removing the base gasket does. So while saws like the 660 Stihls, than don't have much surface area for a sealing surface, decking the cylinder it the only reliable way to increase compression, these 576's have a lot of sealing surface area lending them to a reliable no base gasket build concept.
Fellow CNY guy here! I just picked up a used 576xp that doesn't run. I've never torn a saw down to this extent, but your videos have been a godsend! Thank you, sir!
Wanted to say thank you very, very much for taking all the time & effort involved to record & share your knowledge and experience. I bought a 576xpat based on your tear down and impressions of the build quality and robustness of this saw. While researching which saws look to offer better longevity, of course, you come across all kinds of contradicting opinions, and criticisms about weight etc... with little, if any proof. You, however take the time to SHOW the difference, for example, between the Stihl (also excellent saws in the pro line) and the Husky cylinder, and other components, as well as your commentary on weight being due to more robust parts. It's very much appreciated, thanks again!!!
thanks for your great videos ! i do small engine repair 7 days a week and love it .. i really enjoy working on vintage chainsaws on the side . i dont know what it is but a chainsaw is my favorite tool to rely on ,, you can build a shelter , a deer blind , plenty of fire wood , get your truck unstuck ,, to me my chainsaws are my best friend , its a man thing i guess lol , i always keep a stihl ms 193 in my tool box on my truck and a stihl ms 270 farm boss at the house and several echo and all kinds of vintage saws ready to roll . ive even got a few chicken squat poulans and they arent to bad ive seen em runn right up there with a stihl i believe its really how well you take care of one and always use good gas and they all work good
Always enjoy your saw vids, Walt, and hearing the thoughts behind the action! Thanks!
you have the best chainsaw videos on you tube ,, thanks again for the info
thank you..
I have a problem with buying anything I can't work on, and I can't get the software to diagnose these new saws. I guess I'm stuck with all the old stuff. They'll outlast me anyway. Keep them coming, great videos.
That is one bad looking saw Walter! I really like how they look and the beefy build they have. I was looking at one at a Husqvarna dealer hanging on a shelf and admiring it back in March. The dealer was a solid 2 hours away from my home in Elgin, Illinois.
it has a nice sound to it. and looks like well build and fairly easy to work on.
Great video Walt. I have a 570 with 575 xp cylinder on it base gasket delete and muffler mod. The saw seemed lazy I put a coil of a 2159 Jonny and it seems to have helped at idle and runs more rpms.
another great video. I'm looking for my next saw to modify right now. I modified one of my dad's ms391. it's running great. I did a muffler mod a mild port and Polish job.
Do you think I could get away with putting a meteor piston in a husqvarna 372 x torq cylinder with gasket delete without doing a squish test with solder? I don't have solder or measuring tools
I can't say that, u could be the exception that has the piston smash into the squish band.
Walt,
Anymore plans on getting to the 576 build? I would love to see how to port one.
Thanks Nick W.
For years I did not know Jack about what you were discussing about Husqvarna 372 but I do, now. There are some things I like about the 372 and some things I do not like. I cannot say it is a better design than moms 440 but it sure cranks a lot easier than my big Stihl saws. Weight wise, it is about the same as my 440 and a lot less than my 460. It does seem to oil a lot better than my Stihl saws. I have the oiler turned down to just slightly less than the midpoint of the adjuster with a 20 inch bar. Had a few problems with the supplied carb but I have it straightened out, now., primarily due to a leaking needle.
Just wondering if you checked the squish with the base gasket removed on the 576? Some guys are saying the squish is to tight on the 576? Thanks
As I mentioned in the video, it was .040 with the gasket & approx. .020 without. Solder method of measurement.
Does the Auto Tune adjust its self after a muffler mod? Or did you have to re-tune it?
It will tune around a muffler mod.
Great video thanks Walter! Can the gasket just be removed for the performance improvement or does the piston have to be adjusted as well? I don’t have any tools to measure to that size of thousandth.
As well, on muffler mod, do you jus bore hole into muffler and add piece of pipe like you did? Does diameter and length of pipe matter?
Many thanks. I’m new to saws and mods but eager to learn.
It's a maybe on all those saws, have to measure to be able to decide if a no base gasket build is possible.
Happy new year
Good video, and thx!! Just wondering about a reasonable estimate as per actual rated HP boost???
Thanks have you deleted the base gasket in the 372 Xtorq? Just wondering if there's enough room.
Yes .. I think one of my dead saw salvage video's shows that and the other rather easy to accomplish 372 X torq mod...:)
I have watched all the 372 Xtorq videos and don't see where you modify the intake divider? Can you elaborate the gains? Thanks
A long discussion... I have and will build a couple 372 X-Torqs with the dividers in the filter holder and intake boot removed. All thing being equal that change by itself isn't going to make a lot more power. But what it will do is wash the sides of the piston where the x-torq channels are with a fuel/air/oil mix vs. straight air. That's got to help longevity. Another observation is it seems to make them run better at idle and low RPM's, and they start easier. The down side is you risk destroying those intake parts if not skilled.With down stream changes in the port timing, muffler outlet size, compression, intake timing etc. You have the larger x-sectional area of the now gutted intake to help feed the monster.
new here, but trying to get caught up. I build and use saws as a hoby and find your videos very helpfull.Hope you dont mind if i stick around thanks MJ
Hello. I have a question, What diameter did you use the tube at 24:38, I mean the diameter, external diameter and thickness of the tube wall and what you used to connect the tube with the silencer,And what is the length of the tube?
I can ask for an urgent response?
Nice Video. I own two of them dam good saw's they have power like a 390XP
let me ask u something if we ever had a EMP would our saws today still run because aren't a lot of the new saw run off of a computer chip in our saws
Think you are way over analyzing that. Doubt an EMP attack would make much difference on those simplistic systems. BUT if that's a concern....build some old style 372's and put a couple of those ignitions in a steel shielded box!!
Ok
Hi , Walter! I have a question, I want to buy a modified chainsaw, will it last as long as an unmodified one?
No :)
Thanks a lot!
I got one of those… I just got the cheap moly popup piston kit for it and I found a manual adjustment carburetor to pull out that self adjusting version??? Guess we’ll find out how good it will run… it’s just a cool lower transfer design…I did a chop saw and thought it was just a wicked feed system so I was looking for the cylinder design in a saw… it think it’s a stronger saw then the Stihl would be???
The "Self Tune" usually runs stronger than the manual tune versions :) And they run about like a 461 power wise.
@@afleetcommand yes indeed… yes, that’s actually the only problem that I really have with the auto tune system and that’s that they allow the engine’s to run at their top rpm’s or you don’t have the ability to make a selection were you can choose to be running rather rich and actually limit their top rpm’s electronically… I’m often just 11,800 or 12k on most of my saw’s as I don’t want to allow them the opportunity to free rev up at 13,500 or 13,800 or 14k in the ported version’s… my little ported 350’s want to four stroke at 14,500-14,800 but I’m very rich and just 12,500 max as the actual chain speed in the cut is much closer to the 11k type numbers… I’m just not really comfortable with those super high rpm’s and since it’s really only ever in that upper stratosphere in a free rev no load type situation then I’m probably over protective of their engine’s and I keep them quite retarded and very rich… I’ve found that they have super torque and they’ll bounce and clean up under the heavy load when you really dig in and twist them through a log and they just sing and rip right through… I’m definitely over protecting of my engine’s as almost all of them were complete rebuilds from the ground up…so they are all much more sentimental than I had just bought them off the shelf, so to speak…. I had a good dozen saw’s from my buddies company over a two year period and they were all getting over rev’ed and had transferring and damage…he had been mixing 50:1 with pump gas so with the additional ethanol probably was really somewhere closer to 75:1 in the actual combustion chamber/cylinder because the alcohol’s cutting of the oils film strength and lubrication abilities… since he’s adopted the 32:1…4 Oz oil per gallon of pump gas and all those saw’s with carb adjustment are at 12,500 not 13,500 and rich… there’s been zero engine damage issues… they are still dropping them out of the tree’s and running them over but they do walk around pinning the throttle to warm them up a little less often and they are surviving the abuse a little better having a little additional oil and a little less top speed… no one has even noticed that reducing of the top rpm’s as the cut speed is right there where they were previously…I’m not interested in massive engine changes that burn much additional fuel or make additional heat… small change’s to help them run as efficiently as possible I’m interested in…pick the right tools for the job at hand kinda logic…I think just as much about the fuel mileage as I do about the ultimate power of the engine… I have no desire to cut through a log a couple seconds faster if I’ve got to refuel it twice as often. ??? I’ve been playing with the 372 Xtorq with the little pocket cut into it’s intake on the cylinder to pre-mix the fuel mixture and air in the intake instead of the cylinder…so I’m probably going to be using that technique like on (the 372 Xtorq engine) for this one as well with a few little changes to the intake side to eliminate the fresh air hitting the piston’s and slowly moving back into the actual intake boot area possibly… the little pockets created in the cylinder appears to be doing just what I needed or wanted them to do and there’s some mixture happening before the cylinder bore so hopefully that will be a good solid bump in the engine’s longevity….???? 👍😁. Awesome stuff, thanks much… love that you in-bolted that cylinder without completely disassembly of the entire intake assembly…that’s a big work and time savings to get into the piston!!! 👍😁💪🇺🇸😁👏😎
@@afleetcommand I will say that if a guy like’s the look of the high top 372 series he be doing a back flip over the popup top on the 576’s… they are definitely a high top looking set of plastic’s… I had a complete flywheel and the intake assembly come with the complete 576 I found a I just realized that in a lot of a half dozen 372 bottom end’s I picked up that there’s a 576 case’s so it’s looking like a crank and topend kit and there’s almost a second one here… so it’ll be the more experimental version maybe… I don’t care for massive amounts of compression or other more radical changes to an engine normally as I’ve found I end up loosing my fuel mileage very quickly for small power gain… I’m really liking the 365 48mm bore version’s with a 20” or 24” as I’ve got plenty of power to do that “work” and I’m filling up the gas tank less often… just enough to be able to work efficiently…as frugally as possible is my modus operandi ….👍😁
I'll read that later all the way thru, but think u are over analyzing , they are rev limited as well They aren't going to hurt them selves in fact the one thing you will get is a constant fuel mixture across the multiple seasons. IF you clean up the combustion chambers and do a muffler mod along with getting the squish in the .020 to .025 range they will survive pro level use for a few years. You know how I know? I did a few like that back in the 2015-6 era and they still are out earning money. Did a video on one a few years later in around 2016 I think. First one I did like that 2014-15 came back crushed.
@@afleetcommand I wasn’t thinking about that blue…limited coil… they were running those to limit them… I usually swap them so they are easier to tune but I’ll stop doing that too! Yes, unfortunately I have a tendency to over analyze everything… appreciate your great, very informative video’s. 👍😁
Did you ever do any mods on the other 576 saw? I just bought an older low compression 570 nonXP. I've pulled the cylinder and the piston is scored with some light Al transfer. I think I can polish the cylinder and save it. I need to order another piston for it. Tried ordering a 365 and 372 piston from Hutzl and they are the wrong size and configuration. Didn't realize the 570 piston had a ported piston it appears. The 365 piston appears to be ported also but is too small. Thanks Ken
Yup. A squish of .020 along with a muffler mod does wonders on those.
Thanks Walt, Hope all is well with you and your's.
Nice video. Did it need carb adjustment? Is the carb adjustable?
This one is an Autotune...
my brother has a 576. we are fairly equal in soft wood with my 372 x torq.. where the 576 shines is in hardwood. not even a comparison. He will have his 36 inch white oak on the ground while I am still making a wedge. not an exaggeration.I have raced him with my other 3-372s same thing.all saws stock.
They feel like a 390XP in power
The difference between a 372xp and that saw is what, the cylinder head and piston?
Completely different design from the cases up. While the 576 was the first true pro level Autotune, it could be had with a carburetor as well. What they learned with that series & 562 was where the 572 came from
Awesome Walt 👍👍
Why does my 576xp auto tune stay running at full speed after I release the trigger after making a cut into a log any ideas my local shop say it cannot be put on the computer for diogenes any help
The 576 was an earlier generation auto tune. Probably a mechanical issue in the carb. Most issues aren't autotune related..
Check your carb boot.
why did you only grind the intake skirt? i always thought the intake and exhaust timing should be Square
What is the definition of "square"? I shoot for numbers and on the intake looking to get to the high 70's BTDC on those saws. Dropping the cylnder picks up a bit and either lowering the intake port or a little off the skirt gets the rest. I shoot for specific number ( not saying) on the exhaust as I rather have torque than R's on those. Dropping the cylinder helps that as well and really don't have to do much for what I'm looking for.
@B. Rippy No, a little off the skirt to increase duration on some of those. Either the skirt or bottom of the intake port.
Walt, another great tech talk. You and Bob should have a cheap saw build-off! (Ported Poulans)
The last "Poulan" competition Bob and I engaged in was the "Poulan" throw! He threw it like a baseball.... I used the pull cord to swing it around... I won.
@Afleetcommand Lol!
How much power in reality do you gain from the base gasket delete?
Actually a noticeable gain in torque, Nothing on top as its ignition is a rev limited one.
How are these Auto Tune carbs compare to the 555 and 562xp auto tune carbs?
They are different, maybe an earlier generation. Seem to be reliable from what I can tell.
Oh thats great news to hear because I just order one of these from your buddy Bob. Great guy.
Sorry I missed it. Maybe they vary a lot from model to model?
i have a k 760 engine and i have put it on a schwinn chopper im looking for any advice to upgrade performance note im also a drive line tech with all the tools to mill and turn parts i would pay u for a hp mod if you can help
Best thing is compression, and if you have the tools, measure the "squish" and cut the cylinder base so you end up at around .020. Will make a difference in any two stroke. Also even before that check the squish band to be certain it is nice and flat. Some times you have to trim a little around the edge of the combustion chamber to get a flat squish band THEN measure then cut the base to get to around .020 plus or minus a couple thou. I don't do any work over the internet or by mail. And am backed up with other projects pretty much for the year, but thanks for the consideration.
Если можно подскажите хускварна 576хр обороты холостого хода и максимальные на полный газ.Спасибо с уважением к мастеру с золотыми руками.
You do not have to assemble the 372 in a specific order but you end up taking off a lot of already installed parts if you don’t, much more so than on Stihl saws. Also, some of the procedures that were difficult on Stihl saws were a piece of cake on the 372.
Think so...:) Guess you still haven't met "Jack" :) ALL saws require a order of events. The 372 is by far the easiest pro saw to disassemble and re-assemble currently on the market place. AND a Huztl 372 is a different animal than an OEM, especially in how they run. As far as chain breaks.. you have to be kidding me. A 660 or similar vs. a 372 390? SOME day you may actually meet "Jack" :)
@@afleetcommand agreed, to some degree. It was a learning curve for me.
Where is the auto tune socket on the 576xp I can't find it on mine
Some 576's weren't Autotunes...
James Steele the auto tune 576xp was built before the 550-562xp auto tunes where out. Because of this it was the first generation auto tune. You can't plug this saw into the computer as it is a closed circuit. If you have a problem with the module you will have to replace the module that sits on top of the carb.
A dealer meeting I went to last year they said they where going to change to the second generation, but yet to see/hear when they do this.
im ready for part 2.lol
Any plans for part 2? Don't let those 390's take up all your time.
LOL after the snow storm I will build the "junk parts saw" then do a two more keeping track of the actual costs.
Вы очень хороший мастер! Я часто смотрю Ваши ремонт-обзоры,но к сожалению не понимаю Вашу речь т.к. Я с Украины, если у Вас будет возможность показывайте герметики,фиксаторы,промывки на камеру.Вот сколько смотрю не пойму чем Вы мажете прокладки под цилиндр,между картерами под глушитель.Запчасти ставите оригинал или есть хорошие аналоги
On the "no base gasket" builds I always with out exception use Three Bond 1184. I have had other brands fail even though they claim to have similar properties, in ten years almost 11 I have yet to see the "Three Bond" product fail. They are a Japanese company and made their products for the Japanese Motorcycle & Automotive industries..
Cool
So youre opinion of the 461 isnt the best im guessing haha?
Actually the ones I've seen in action were quite good. I'm hoping this cylinder was an anomaly.
+afleetcommand Thats what I thought, I just bought a 261c great lil saw, interchangeable b and c with the 2 290s I have. Although im almost kicking myself because I ran a 555 after I owned the stihl and man, they are nice...
Stihl's are nice too. Have to say the 555 is an eye opener for the money
562xpg a good saw
So is the 576..:)
Nice work walt! I run a 576xpg its great saw, better still when we run it on Aspen fuel.
www.aspenfuel.co.uk/products/environmental-fuels/aspen-alkylate-petrol/aspen-2-full-range-tech/
With the above fuel you get zero carbon build up and the auto tune saws run way cleaner and sharper.