Author Topic: Echo 590  (Read 3533 times)

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Offline 1manband

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Echo 590
« on: April 19, 2014, 01:32:09 pm »
picked one of these up today, for what i think is reasonable price.

initial thoughts (before putting it into wood):

-seems it likes cheeseburgers a little more than salads.
-plastic looks thinner than your typical husq.
-one of the spring anti-vibe attachment points is to a plastic tab.
-another attachment point for the spring anti-vibe has an unusual nylon strap.  (believe it may be there to limit total movement?).
-air filter is nylon mesh.  looks more like an after thought.  seems wimpy, and do hope it will seal well, unsure that it really can at this point.
-chain adjuster location is very convenient.  bar nuts do seem small.
-the dog resembles a steel stamping.
-equipped with an 18" guide bar, it's well balanced, and does not tip over like my husq at rest.
-the effective cutting length of the 18" bar seems very short.  whether it's from the large dog teeth or something else, will measure it, to be certain.
-has a winter/summer slider, i'll have to look through the instruction booklet to see which position is which.

it is, what it is.

the saw came with a sqrench, and weird kick-back bar end adapter w/nut and bolt, in the bag.

as soon as i can figure out how to correct my camera/computer hardware recognition problem, will post up some photos of the observations above.

regards
-joe

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Offline 1manband

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Re: cs-590 wolf review. bone stock.
« Reply #1 on: April 19, 2014, 05:33:35 pm »
closer look on a few things:

-adjustable oiler
-plastic clutch cover
-chain drive spur gear looks of good quality, to drive the oregon 3/8 ths chain.
-inboard clutch.  (anyone who has taken a clutch cover off a husq with the chainbrake on should know what i think about this.  yay! hahaha.)

-tried moving the winter/summer operation switch, it got stuck on winter position.......
....this led me to have to remove the carb mounting bolts.  (did not want to break anything).

then found:
-walbro carb, mounting bolts (T27) seem to thread into plastic.  (possibly, metal nuts are on the back side, but i did not remove to be sure.  did see tapped threads going through the plastic, though).  the intake tract looks like a straight shot into the cylinder.

-air filter, which originally thought may be an issue, is not.  fully enclosed and sealed, and should work fine.

-plenty of room in the bottom of clutch cover to eject long sliver chips when noodling.

-the muffler exhaust outlet location, is on the top face of the box muffler.  directly under the plastic chain brake handle.  looks similar to typical style, as used on their weed-beaters.

-the gasoline level can be seen somewhat in bright sunlight, through the semi-transparent tank plastic.  on a cloudy day, good luck with seeing that.


-joe
(still working on the pictures problem).



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Offline 1manband

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Re: cs-590 wolf review. bone stock.
« Reply #2 on: April 22, 2014, 05:04:44 pm »
pic #1 oiler: turned it down to lowest setting.  exxon valdez in oiler.

pic #2 "nylon strap to anti-vibe

pic #3 muffler outlet location

pic #4 oregon? bar

now that i can post up photos again, will post up some tweaks made air box, and carb.

ran it:  first impression, it's good, not fast... but has some torque.  did not bog down, under some downpressure.

muffler temp at the after 1 tank was 181*F.  don't think that was too high at all for a cat equipped muff.   (measured with a fluke IR thermometer).  in comparison, my Husq 340, (without a cat muffler) runs 168*F.

-joe
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Offline sharkey

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Re: cs-590 wolf review. bone stock.
« Reply #3 on: April 22, 2014, 06:22:42 pm »
No cat in these mufflers that I know of.

Be very careful with those carb mount bolts.  With my calibrated wrist a half sneeze past snug and the bolts strip.  If they strip, you will need the echo 8000 nuts and bolts or a new tank because the partition is part of the tank. 

Im working with one now.  I opened up the muffler and widened the intake and exhaust/transfers and put a bigger carb on to see how it would react.  The air box is pretty restrictive so I went with a v-stack and a uni-filter.  Weather permitting will run it this weekend and let you know.         
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Offline 1manband

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Re: cs-590 wolf review. bone stock.
« Reply #4 on: April 23, 2014, 05:42:31 pm »
thanks for the heads up on those carb bolts, sharkey.

the instruction manual said "catalytic emissions."  sticker says my saw was born on may 2013.  did not take a peek into the muffler yet.  hope it does not have one.

the partstree site listed two IPL's for the cs-590.  one for 2012 models? and 2013? guessing on years, because it goes by serial #'s.  could you by chance be working on a 2012?

that air box elbow to carb thing is odd.  trimmed it down quite a bit.  your solution sounds better.

got the carb tweaked up, but went way too far.  now, can't get a steady idle.  i'll get the idle back.  just need to get the soldering iron out, and some more tweaking to find the right size hole.  once a couple of small parts come in, the tweak will become permanent.  will post some pics, later tonight of the process. 

regards
-joe


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Offline sharkey

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Re: cs-590 wolf review. bone stock.
« Reply #5 on: April 23, 2014, 07:25:21 pm »
Hi Joe,
The one Im working with is a 2010, 600p.  I wanted an early one to see what was coming in the way of changes.  So far I havent seen much. 

What did you do to the carb?

Bob 

Offline 1manband

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Re: cs-590 wolf review. bone stock.
« Reply #6 on: April 23, 2014, 08:22:41 pm »
bob.........the carb stuff is nothing fancy.  the camera i left at work, will post them tomorrow.  the pics will explain it a whole lot better then i can do with words.

idea is get better mid range and WOT adjustability.  the idle speed screw is turned in on the stock carb say "x"amount of turns, the air goes by the small indent on the butterfly, but quite a bit of the air gets by the butterfly by going around the outer circumference of the butterfly.  the combined air helps set the mix at idle speed.

i turn the idle screw out as many turns out it takes to just close the butterfly completely.  (what that does), now the only air that can get by the butterfly, is going through the small indent.  then i drill a few holes in the butterfly, which will control idle speed air only.  thing is, you have to guess how big and/or how many.  tune the saw as usual, get it hot, then tune the idle speed.

thats the gist of it.  right now, i have too large and/or too many holes.  idle leans out and speed goes up.  plugging the holes one by one, then test/tune, after each plug.  then i'll get a new butterfly.  then tranfer the best final best size hole to it.

right now, it runs very well, except for the idle.  the low speed is more like an intermediate jet, the high is still the high, but the hole is now like an fake idle jet.  hope it makes sense.  if not, the photos hopefully will.  some photos show some mistakes and bad guesses made along the way made as well.  but it's all part of the process.

regards
-joe 








 
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Offline sharkey

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Re: cs-590 wolf review. bone stock.
« Reply #7 on: April 24, 2014, 09:49:00 am »
Here are a couple pics of this 600p with the V-stack and Uni sock filter. 

The HDA-66 on there now is a little larger.  Dimensions for the HDA-66 are: Choke Bore 22.20mm, Venturi 15.88mm and Throttle Bore 19mm.  Original HDA-268 is 19mm Choke Bore, 15.08 Venturi, and 19mm throttle bore.  The 590/600p uses the longer resonance tuning of the air box with the smaller choke bore of the HDA-268.  Take your air box all the way off and look at it from where it attaches to the carb.  All together it looks to be about 4 inches in length.  I havent done the calculations on the intake, Im just trying different carbs to see if there are any benefits that jump out at me.         

When you had your carb apart and the metering diaphragm off, did you notice the feed hole in the main nozzle base?  Semi-fixed H jet at .058mm.  It will feed fuel directly from the metering chamber no matter where you have your H twist jet set at.  Should only flow when vacuum is high though.  I dont think its a bad idea, just there for warranty purposes I suppose.  Can plug it if you want to.  Usually these Walbro carbs will flow plenty of fuel, its getting enough air to burn that fuel that matters.     
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Offline sharkey

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Re: cs-590 wolf review. bone stock.
« Reply #8 on: April 24, 2014, 09:54:12 am »
Pic 2
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Offline 1manband

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Re: cs-590 wolf review. bone stock.
« Reply #9 on: April 24, 2014, 07:22:07 pm »
Here are a couple pics of this 600p with the V-stack and Uni sock filter. 

The HDA-66 on there now is a little larger.  Dimensions for the HDA-66 are: Choke Bore 22.20mm, Venturi 15.88mm and Throttle Bore 19mm.  Original HDA-268 is 19mm Choke Bore, 15.08 Venturi, and 19mm throttle bore.  The 590/600p uses the longer resonance tuning of the air box with the smaller choke bore of the HDA-268.  Take your air box all the way off and look at it from where it attaches to the carb.  All together it looks to be about 4 inches in length.  I havent done the calculations on the intake, Im just trying different carbs to see if there are any benefits that jump out at me.         

When you had your carb apart and the metering diaphragm off, did you notice the feed hole in the main nozzle base?  Semi-fixed H jet at .058mm.  It will feed fuel directly from the metering chamber no matter where you have your H twist jet set at.  Should only flow when vacuum is high though.  I dont think its a bad idea, just there for warranty purposes I suppose.  Can plug it if you want to.  Usually these Walbro carbs will flow plenty of fuel, its getting enough air to burn that fuel that matters.     

bob.......thanks for sharing the good info!  like the way you are going with this.  totally agree with the point, you make, that it needs more air.  how is it with the larger carby?

haven't gotten to the point of thinking about intake length tuning.  will work out some numbers on 4 inches, to see what we have.  thought about this kind of thing a long while ago, the lengths needed were more than 4 inches if i remember correctly.  maybe can shoot for a harmonic of the proper length??

have not taken the bottom of the carby off.  did not want to plug anything after seeing how much fuel 298A can add.

my angle of thinking to all this, is just trying to delay the crossover feed point of the of the low to high speed jet to a higher rpm.  similar to the way a bigger carb behaves, compared to stock.

pics in my next post.

regards
-joe







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