Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Echo => Topic started by: Cut4fun . on September 01, 2012, 10:31:22 pm

Title: Echo 3900
Post by: Cut4fun . on September 01, 2012, 10:31:22 pm
Searching for info on Echo 3900. Anyone got any first hand experience with these?

echo usa info  http://echo-usa.custhelp.com/app/answers/detail/a_id/599/~/cs-3900---product-information
Title: Re: Echo 3900
Post by: Cut4fun . on September 01, 2012, 10:32:59 pm
I see it's a clamshell from IPL.   3900 IPL  http://s30387.gridserver.com/partsDiagrams/Echo%20CS-3900.pdf

Pic I found
Title: Re: Echo 3900
Post by: Cut4fun . on September 01, 2012, 10:47:30 pm
9.5lb PHO weight sound about right?   

Video I found of one.

http://www.youtube.com/watch?v=gWGMDNQezR4
Title: Re: Echo 3900
Post by: rockyridge on September 10, 2012, 10:30:48 am
Hey,

Funny you linked that video.  I bought that exact saw off ebay earlier this year.  I really like the 3900 with 16 inch bar.  It is a good, light limb saw.  Anything over 10 inches in hardwood and it gets a little slow, but that's why I have a 6700 with 24 inch bar. 
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 10:40:33 am
Cant find to much info on them.  What you see it what  all I dug up.

I found out this 3900 is going to need a on/off switch, it was removed by prior owner I guess.  Still in the mail somewhere.
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 05:05:50 pm
3900 arrived.

Having a issue and I think I am thinking right on this. No spark at all. The on/off switch is missing and the 2 wires are not touching, 1 is on the plastic part where switch goes through other is just there not touching nothing.  Should be showing spark when pulling over right?

 :o :o If it is the coil I guess she wont be getting a new one   Echo 15660137330 COIL IGNITION    $88.80    :o :o
Title: Re: Echo 3900
Post by: 660magnum on September 10, 2012, 05:25:21 pm
Correct. The switch wires when connected short out the ignition so it doesn't fire.

If the wires are not connected to anything, then the ignition should fire

Be sure and check if the plug wire and the spark plug are OK?
Title: Re: Echo 3900
Post by: rockyridge on September 10, 2012, 05:36:42 pm
If you don't end up fixing it, I'd be interested in buying it from you.  I was gonna bid on the dirtiest 3900 I've ever seen on ebay last week but didn't get around to it.  It sold for $30.  He may have gotten a bit more if he'd have put forth ten minutes effort to wash it off...


(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=1155.0;attach=1548;image)
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 05:50:05 pm
If you don't end up fixing it, I'd be interested in buying it from you.  I was gonna bid on the dirtiest 3900 I've ever seen on ebay last week but didn't get around to it.  It sold for $30.  He may have gotten a bit more if he'd have put forth ten minutes effort to wash it off...

I got it's twin sister on the bench. Right from the wood pile to a shelf for about 5 years or more. Coil must have went bad sitting.  I'm going to pull everything first to make sure before I make a decision. I had good $ in it taking it on trade on husky parts I sent out for it.
Title: Re: Echo 3900
Post by: 660magnum on September 10, 2012, 06:56:51 pm
If you don't end up fixing it, I'd be interested in buying it from you.  I was gonna bid on the dirtiest 3900 I've ever seen on ebay last week but didn't get around to it.  It sold for $30.  He may have gotten a bit more if he'd have put forth ten minutes effort to wash it off...


(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=1155.0;attach=1548;image)

No one was going to steal that chainsaw after it was painted with a silver paint brush?

My dad did a lot of marvelous designs in his time but he painted everything with a silver paint brush.
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 07:20:02 pm
Mine is grey just like one in pic, not silver 660.

I just removed the coil and all wires. Cleaned everything and made sure all was right and gapped right going to flywheel and put  back together. Still no spark.
I took my spark tester and put on another saw to make sure it  worked, lit right up so it was good. Just a bad coil IMO.

Shame feels like good compression pulling over and plug was getting fuel to it.


If you don't end up fixing it, I'd be interested in buying it from you. 

I'm listening to trades or offers in  PM's.   Going to put it back together and shelf it if no deals are made and wait on a used coil in the future. 
Oh I'm not washing the dirt off this one either now that she dont want to run.   :D :D ;)
Title: Re: Echo 3900
Post by: 660magnum on September 10, 2012, 07:38:42 pm
I guess it was just very dirty then?
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 07:49:18 pm
I guess it was just very dirty then?

Here is the rest of that dirty 3900 feebay pics for you  http://www.ebay.com/itm/ECHO-CS-3900-CHAINSAW-FOR-PARTS-COMPLETE-HAS-COMPRESSION-NO-FIRE-ON-ETHER-/110945373423?pt=LH_DefaultDomain_0&hash=item19d4dc0cef
Title: Re: Echo 3900
Post by: rockyridge on September 10, 2012, 11:18:40 pm
I got a parts saw here.  It's mostly stripped, but I'll look to see if there's a coil still on it.
Title: Re: Echo 3900
Post by: Cut4fun . on September 10, 2012, 11:54:54 pm
I got a parts saw here.  It's mostly stripped, but I'll look to see if there's a coil still on it.

This one is missing the on/off switch, air filter and a dead coil.   Let me know.

I might look at other coils to see if I can get something to work. echo coils look to be one of kind though.
Title: Re: Echo 3900
Post by: rockyridge on September 11, 2012, 09:52:33 am
Sorry. I got your hopes up.  The saw I have is missing the coil.

Let me get your hopes up again - I just talked with my favorite Echo dealer and he said some echo coils are guaranteed for life.  He didn't know if the 3900 was on that list, but it might be worth looking into...
Title: Re: Echo 3900
Post by: Cut4fun . on September 11, 2012, 11:10:01 am
Called my local echo dolmar dealer. He wont help wants nothing to do with it. Says call echo. LMAO he is worthless IMO.  He is the reason I got rid of my 7900 back years ago.

Ask him to look up coil and check price for me. he comes back I dont know how to look up the part number on a echo that old  :o   I said so you want me to give you the number   ;D  he is like how did you get that, I'm like right off the echo site and their IPL just like you should be able to.   I will never buy from that dealer JMO.

I think you have to be original  owner of echo  to get a replacement coil under warranty anyways and take it to the dealer and have them do the labor at $60 a hour. No way would I do that.

Title: Re: Echo 3900
Post by: 660magnum on September 11, 2012, 11:19:06 am
He can look up stuff on the Internet just like you can and he can do it right there at the counter because he and I have done it before.
Title: Re: Echo 3900
Post by: 660magnum on September 11, 2012, 11:20:39 am
FWIW there is the woman Echo dealer on US42 just on the north edge of Mansfield?
Title: Re: Echo 3900
Post by: Cut4fun . on September 11, 2012, 11:28:16 am
FWIW there is the woman Echo dealer on US42 just on the north edge of Mansfield?

The good stihl dealer I go to in Madsion is a echo dealer too.   

  I'm just going to shelf it and wait on a used coil or attempt another coil transplant or just trade it.  Like I said the new coil list at $88  :o   the saw isnt worth that IMO.
Title: Re: Echo 3900
Post by: Cut4fun . on September 11, 2012, 11:30:05 am
He can look up stuff on the Internet just like you can and he can do it right there at the counter because he and I have done it before.

So now he just lied to me on the phone. Another reason I wont ever step foot in his place.  ;)
Title: Re: Echo 3900
Post by: Cut4fun . on September 11, 2012, 07:33:45 pm
I had no retro fit coils on hand that would come close.

I'm thinking something in a echo trimmer blower etc may work.

Here is a look at the 3900 coil.

(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo3900coil001.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo3900coil006.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo3900coil005.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo3900coil002.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo3900coil004.jpg)


Title: Re: Echo 3900
Post by: Cut4fun . on September 11, 2012, 08:57:06 pm
Coil part # 15660137330

Pretty neat read I just stumbled on.


The Echo CS-3900 Chain Saw ignition coil [module] has an armature and is U-shaped with two ends [sometimes three ends] facing the flywheel. The coil also has two sides. The primary side has thick wire wrapped around one leg approximately 150-200 times. The secondary side has very thin wire wrapped around the primary windings approximately 20,000 times. The flywheel has two imbedded magnets, a north and a south pole. When the magnets pass the U-shaped iron cores on the ignition coil, the primary winding builds voltage up to approximately 200 volts. Then, the electronic control module trigger breaks the current and sends it to the secondary side of the coil building voltage up to 20,000 volts used to fire the spark plug.

The Echo CS-3900 Chain Saw ignition chip is a trigger device that determines when the coil needs to fire the spark plug. It works by breaking the current from the primary side and sending it to the secondary side of the coil. This transfer steps up the voltage to fire the spark plug. The ignition trigger replaces points and the condenser on most chain saws having just two magnets [north and south]. If a flywheel has more than two magnets, then the ignition chip trigger will not work.

Note: On Stihl models 031, 032 and 041 these coils have a spark advance built into them and the ignition chip will cause misfiring.

To test the Echo CS-3900 Chain Saw ignition coil, disconnect the ignition switch wire at the ignition coil. Using a good quality spark tester, pull the starter rope with a good fast pull and check for spark. Removing the spark plug makes this process easier since it reduces the resistance when pulling the starter rope. If no spark is visible, remove the Echo CS-3900 Chain Saw ignition coil and sand the bottom of the coil. Also sand the mounting surface where the coils are attached to ensure a good and proper grounding of the ignition coil. Note: On some saws, the ignition coil bolts onto a plastic housing with a ground wire running to the cylinder or crankcase for a ground.

The high voltage from the ignition coil travels through an insulated spark plug wire to the terminal on top of the spark plug, then travels down the electrode threw the porcelain insulator to the ground electrode which is connected to the metal bottom body of the spark plug and is screwed into the cylinder.

Spark plugs can either have a metal gasket to seal the spark plug to the cylinder or a taper spark plug to seal the spark plug to the cylinder. The heat from the Echo CS-3900 Chain Saw spark plug is dissipated to the cylinder to help keep the spark plug cool.
Title: Re: Echo 3900
Post by: Cut4fun . on September 12, 2012, 05:46:47 pm
Found a used coil today on a shelf  of a used parts guy I know ;D    and now she has fire and runs.   8)


Sorry. I got your hopes up.  The saw I have is missing the coil.

I'm still needing the on/off switch (my poulan one wont fit) and a air filter.

Also what bar and chain pitch are you running on yours?  I havent removed clutch to check rim for sure but it appears .325 on this one. I would have thought 39cc would have been 3/8LP.
Title: Re: Echo 3900
Post by: rockyridge on September 12, 2012, 11:44:50 pm
I just bought 2 new chains at the Stihl dealer today - 91VXL56E - 3/8 050 56 links.  Took me for $21.50 each  My Echo dealer is 100 miles away and I very seldom get up there.  He charges me $1 an inch, so it'd have been $16 from him...

My 345 runs .325 chain.  All the rest run 3/8 - Two 3900s - 16", 6700 - 24", and 8000 - 36".
Title: Re: Echo 3900
Post by: Cut4fun . on September 13, 2012, 09:22:25 am
This 3900 is set up for 325.   I put a b+c on it with a poulan foam air filter over carb intake.

I found a online echo parts dealer right here in Ohio. I got me a air filter and switch on the way. 

Original AF list NLA with superseded #, I then looked up that number it was NLA with another superseded number. This # showed up as the replaceable AF for 3900 and available $12 plus shipping. We shall soon see if it fits. 
Switch was $6.
Title: Re: Echo 3900
Post by: Cut4fun . on September 13, 2012, 09:48:20 am
Bar mount is K041

The IPL list only 2 b+c combinations on it.   This one has 18" in 325 and I might be changing it to 3/8LP.

16" 33SL 66     bar 16AOAD3366

18" 33SL 72      bar 18AOAD3372 

rockeyridge could you check your rim sprocket or spur for the tooth count. I wonder if you have a 3/8 7T  rim on it.
Title: Re: Echo 3900
Post by: rockyridge on September 13, 2012, 11:46:25 am
I'm not exactly showing much promise on giving good info here.  I looked again and it is .325.  The receipt I looked at at 11 pm last night was wrong.   Now I'm curious what the 345 is because it's a lot lighter chain than the 3900.  The 6700 and 8000 are 3/8, I'm sure.
Title: Re: Echo 3900
Post by: Cut4fun on September 13, 2012, 11:52:37 am
Todays chains are normally  3/8LP  Low Profile aka Picco usually on the smaller saws, .325, full 3/8 like on your 8000 6700,
Title: Re: Echo 3900
Post by: Cut4fun on September 13, 2012, 01:24:04 pm
Wow now that is customer service from the online echo place.  I received a phone call that the switch would have to be back ordered and it was looking like 2 weeks out date to get in right now. Then after that I received a email stating the same and they wanted to know what I would like to do next.

I called back and decide to drop the switch and ordered another part instead with my order.   They will get my echo business from here on. Right here in Ohio too.  ;D


So after that I decided I would make my poulan 3400 switch work in the echo.

 Opened up ground wire O that switch goes through and the plastic housing where switch goes through.  All done and works like a charm.

(http://i59.photobucket.com/albums/g289/doemaster789/2002envoy/3900fix4000p004.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/2002envoy/3900fix4000p001.jpg)

Title: Re: Echo 3900
Post by: Cut4fun on September 13, 2012, 01:26:54 pm
Just waiting on a oem air filter now.

(http://i59.photobucket.com/albums/g289/doemaster789/2002envoy/3900fix4000p003.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/2002envoy/3900fix4000p006.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/2002envoy/3900fix4000p007.jpg)
Title: Re: Echo 3900
Post by: 660magnum on September 13, 2012, 02:13:37 pm
It looks very nice
Title: Re: Echo 3900
Post by: rockyridge on September 14, 2012, 03:25:06 pm
You're right.  The 345 has 3/8 LP.  It's a good little limb saw.  The chain has a narrower cut and it can slice through small limbs pretty quick.  I only wish it had a 14 inch bar, not 16.  That extra just gets in the way when I'm limbing stuff under 6 inches.

That saw looks to be in good shape.  I wouldn't want it with an 18 inch bar, though.  Both mine match nicely with 16 inch bars.

You gonna sell it of keep it?
Title: Re: Echo 3900
Post by: Cut4fun . on September 14, 2012, 05:00:36 pm

That saw looks to be in good shape.  I wouldn't want it with an 18 inch bar, though.  Both mine match nicely with 16 inch bars.

You gonna sell it of keep it?

I'm going to put a 16" or smaller bar. Got to see what I got on hand.

As soon as I get the air filter and fine tune carb she can go to a new home. I'm not planning on keeping any saw I own IMO ;) well maybe 1 or 2 LOL.  They all live on my shelves on borrowed time.   :D
 I have a co-worker waiting on this one to be finished so they can stop by in the future and try 3 of my small saws out.  2 poulans and this echo.   

Let me know what you have in mind  in a PM. I can let it go PHO since you have bars and chains.
Title: Re: Echo 3900
Post by: Cut4fun . on September 16, 2012, 01:43:50 pm
Well I found a 64dl 325 15" bar and put it on the 3900 yesterday. Figured the new air filter would be here Mon in the mail.

Only thing was when I went to test it with new set up it fired off but didnt start like it had been. Then I pulled and pulled and pulled and it never fired again.   :P :P

So I put the spark tester on it no spark again.  :-X :-\  I'm cleaning the contact plate (after I get the flywheel off) and all connections again.
 If she dont have spark after all of this I am just going to assume the coils for these are a problem area.

Title: Re: Echo 3900
Post by: Cut4fun . on September 16, 2012, 02:54:46 pm
Found it during halftime. Where the plug wire goes into the coil. 

Anyone know how these plug wires are attached to the coil inside?  Do they screw in or glued in?

 Wish now I hadnt thrown the old bad coil away so I could dissect it.
Title: Re: Echo 3900
Post by: Cut4fun . on September 17, 2012, 06:50:28 pm
This new used coil quit again today. I'm going to pull the plug wire from coil to take a look some how later.

I'm not going to buy another coil.

If this dont fix it trying to remove old plug wire  and put another in it's gone or will be parted out.
Title: Re: Echo 3900
Post by: Cut4fun . on September 18, 2012, 03:11:39 pm
The coil is dead for sure now.  ;D

The plug wire wouldnt twist out like a husky so I just pulled the snot out of the wire and it came apart deep in the coil. So I then took a hacksaw to see how it was made in there and it was permanently attached.

I'm done with this 3900 because I am not paying $80 for a new coil and all it needs IMHO.

Trades or offers and will be listing in the trade section.

Also still have a new never used 3900 air filter in route.  ::)
Title: Re: Echo 3900
Post by: Cut4fun . on September 18, 2012, 07:28:02 pm
 Some info I picked up while searching Echo.   



Bars & Chains:

16F0AD3366 - 16" ProAm Double Guard Bar   

20LPX66CQ - 16" Super 20 Chain - 66 Links, Oregon LPX chain, 0.325 Pitch, Top filing angle 25 degrees, File Guide Angle 10 degrees, Depth Gauge Setting .025", Depth Gauge Tool # 22290, File Diameter 3/16".           
       
33SL66CQ -  16" Double Guard Chain - 66 Links, Oregon 33SL chain, 0.325 Pitch, 0.050 Gauge, Top Plate filing angle 25 degrees, File Guide Angle 90 degrees, Depth Gauge Setting .025", Depth Gauge Tool # 22290, File Guide part # 31692/37534, File Diameter 4.5mm or 5/32" part # 40461 or 40459.  (Discontinued)     

18F0AD3372  - 18" ProAm Double Guard Bar   

20BPX72CQ - 18" Micro Chisel Chain - 72 Links, Oregon 20BPX chain, 0.325 Pitch, 0.050 Gauge, Top Plate filing angle 25 degrees, File Guide Angle 90 degrees, Depth Gauge Setting .025", Depth Gauge Tool # 31941, File Guide part # 31690, File Diameter 3/16" or 4.8mm.

33SL72CQ  - 18" Double Guard Chain - 72 Links, Oregon 33SL chain, 0.325 Pitch, 0.050 Gauge, Top Plate filing angle 25 degrees, File Guide Angle 90 degrees, Depth Gauge Setting .025", Depth Gauge Tool # 22290, File Guide part # 31692/37534, File Diameter 4.5mm or 5/32" part # 40461 or 40459. (Discontinued)

Chain Sharpening:

99988800740 - 5/32" File 3-Pack (ECHO Branded)

99988800725 - 5/32" File Box of 12 (ECHO Branded)

99988800720 - 5/32" Chain Sharpening Kit - Includes Round Files, Flat File, Bar Scraper, File Guide, Handle and Carrying Pouch.

-OR-

99988800741 - 4.5 mm File 3- Pack (ECHO Branded)

99988800726 - 4.5 mm File Box of 12 (ECHO Branded)

99988800721 - 4.5 mm Chain Sharpening Kit - Includes Round Files, Flat File, Bar Scraper, File Guide, Handle and Carrying Pouch.

Storage:

99988801207 - "ToughChest 24" Chainsaw Case - Holds up to a 24" Bar and Chain along with necessary tools and supplies.

89850308034 - Plastic Scabbard - 20" Bar and Chain Scabbard. Marked in 2" increments to be cut anywhere between 12" and 20" in length.

SPECIFICATIONS

Engine Displacement: 39.6 (cc)         
Engine Displacement: 2.4 cu. in.

Length: 14.8 in.    Height: 8.4 in.    Width: 10.4 in.    Dry Weight: 9.5 lbs  (w/o bar & chain)
Carburetor: Walbro HAD type diaphragm               
Chain Tensioner: Side         
Chain Length (STD): 16"               
Chain Length OPT): 18"               
Vibration Reduction: STD               
Oiler: Automatic/ adjustable               
Oil Capacity: 7.8 fl.oz.               
Fuel Capacity: 13.5 oz.

TECHNICAL INFORMATION

Manufacture Date: 1990 - 1993                   
                             
Spark Plug: NGK BPM-7A OR 7Y

Spark Plug Gap: .024 - .028"                   
Shortblock: SB1013                   

Operating Speed: 8,000 - 9,500 RPM                   
Idling Speed: 2,700 - 3,200 RPM                   
WOT NO LOAD/ with bar and chain: 13,500 - 14,000 RPM
                   
Secondary Coil Resistance: 1.5 - 2.5 (K) Ohms                   

Fuel Ratio: 32:1 OR  50:1 WITH SPECIAL OIL APPROVED BY ECHO                   

Carburetors Used   Echo Part Number         Repair Kit          Gasket Kit         
WT-118A                 12300037332                 12310037330      12310137330         
WT-118B                 12300037332                 12310037330      12310137330         


Title: Re: Echo 3900
Post by: rockyridge on September 20, 2012, 10:26:11 am
Sorry to hear you've had such trouble with the saw.   :(
Title: Re: Echo 3900
Post by: Cut4fun . on September 20, 2012, 01:03:17 pm
Not having troubles with the saw, just the coils.  :D :D


Echo only cover coils for 10 years after the model was last made. I checked with echo directly.

ECHO products feature a lifetime warranty on the ignition module. ECHO's liability under the "Lifetime" coverage is limited to furnishing parts for "Life" free of charge for a period of ten (10) years after the date of the complete unit's final production.The lifetime warranty is extended to the first original retail purchaser and is not transferable to subsequent owners. The ignition module must be tested and replaced by an authorized servicing ECHO dealer. *Rental units do not quality for lifetime warranty
Title: Re: Echo 3900
Post by: Cut4fun . on September 24, 2012, 06:58:38 pm
So which one of you 3900 owners was bidding me up.   ;)   Man what a money pit this 3900 has become. 

Figured it was cheaper to buy a running 3900 and have a bunch of extra parts too since these were only made 3 years and seem in short supply.   

All I need now is this coil in the runner to go bad and I will  have a echo clay shoot.  ;D  :D ;D

 Hopefully it arrives in one piece.

Title: Re: Echo 3900
Post by: Cut4fun . on September 27, 2012, 05:56:25 pm
Well #2 came in today and has a good coil and runs sweet. 16" too.
Figured out why the muffler was burning the chain brake too.  Spring that hold handle back was bent out of shape and missing metal stop.

(http://i59.photobucket.com/albums/g289/doemaster789/Projects/2nd3900002.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/2nd3900001.jpg)
Title: Re: Echo 3900
Post by: rockyridge on September 29, 2012, 10:28:54 am
You won that one?  I took the first bid right away and was gonna bid again, but just couldn't bring myself to do it.
Title: Re: Echo 3900
Post by: Cut4fun . on September 29, 2012, 02:47:08 pm
You won that one?  I took the first bid right away and was gonna bid again, but just couldn't bring myself to do it.

Yes. Figured it was cheaper then getting a new coil and now I have a whole parts saw minus a coil.
Title: Re: Echo 3900
Post by: Cut4fun . on October 01, 2012, 06:25:05 pm
Tried a redneck fix yesterday and tried it out this evening. So far it's good. Be interesting to see how long it last, because this recoil guide seem to be a weak area on these IMO

When I bought this 2nd 3900 it had a issue with the recoil guide being broken and the rope would hang up in mid pull. I took some quiksteel and molded my own half of guide onto the broken area.  :P


BEFORE.

(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=1155.0;attach=1562;image)
(http://i59.photobucket.com/albums/g289/doemaster789/Projects/2nd3900001.jpg)


AFTER redneck fix.

(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo23900truckrearbrakes004.jpg)


Compared to the original on other 3900 recoil.

(http://i59.photobucket.com/albums/g289/doemaster789/Projects/echo23900truckrearbrakes002.jpg)





Title: Re: Echo 3900
Post by: Cut4fun . on October 01, 2012, 08:12:30 pm
I put a new loop of oregon 33 325 on the 16" bar and buried  it in the maple today. I have it set rich at 12.5k ish and max is 13.5k-14k.  I think these are keepers with their light weight PHO too.    ;D

660mag I would like to compare it to the bigger cc 025 sometime.  8)
Title: Re: Echo 3900
Post by: 660magnum on October 01, 2012, 08:29:16 pm
LMK when you want me over there
Title: Re: Echo 3900
Post by: mountainlake on October 02, 2012, 06:07:15 am

 My CS400 was cutting quite a bit faster than my CS4400 with a .325 setup. I switched over a CS4400 (43cc) from .325 7 tooth to 3/8 lo pro 6 tooth, gained a lot of cutting speed.   Same chain as the CS400 comes with, the spocket from the CS400 fit but was a bit too wide and had to be milled a little.  Now the CS4400 cuts a little faster than my CS400.   Steve
Title: Re: Echo 3900
Post by: Cut4fun . on October 02, 2012, 12:40:18 pm

 My CS400 was cutting quite a bit faster than my CS4400 with a .325 setup. I switched over a CS4400 (43cc) from .325 7 tooth to 3/8 lo pro 6 tooth, gained a lot of cutting speed.   Same chain as the CS400 comes with, the spocket from the CS400 fit but was a bit too wide and had to be milled a little.  Now the CS4400 cuts a little faster than my CS400.   Steve

I'd like to find a 3/8LP 6T for this saw. I think the stihl PS chisel chain would be the cats  ;).   They make a rim in 6 3/8lp, never even though about that before.

I know when I used PS chisel 3/8LP picco on my little poulan 260 42cc I could out cut the 025 with 324 rsc in timed cuts.
Title: Re: Echo 3900
Post by: mountainlake on October 03, 2012, 05:00:48 am

 Are you asking if they make a 6 tooth rim or saying they do, I ended up with a 6 tooth spur same as on a CS400. One other thing when i switched my CS4400 over I first tried a 7 tooth 3/8 rim with the lopro but that didn't cut any faster than the .325 setup, maybe worse.  Really came alive with the 6 tooth.    Steve
Title: Re: Echo 3900
Post by: Cut4fun . on October 03, 2012, 06:36:17 am

 Are you asking if they make a 6 tooth rim or saying they do, I ended up with a 6 tooth spur same as on a CS400. One other thing when i switched my CS4400 over I first tried a 7 tooth 3/8 rim with the lopro but that didn't cut any faster than the .325 setup, maybe worse.  Really came alive with the 6 tooth.    Steve

Wow I didnt even know what I said there till about the 3rd time. Must have been out of it.  :-[  I was asking do they make a 6T rim for 3/8 LP?  I can only find spur drums so far.


Also I think the 3900 might be closer to the 023 in the wood then a good running 025.  :o  Big torque difference in the cut with 16" almost buried.

021    2.14    35.2        2.0 bph       
023    2.44    40.2        2.6    "   
025    2.76    45.4        3.0    "   
Title: Re: Echo 3900
Post by: mountainlake on October 05, 2012, 07:39:13 am

 
The only way to find out is running them side by side, once the muffs are unclogged most Echo saws pull good per cc.   Steve
Title: Re: Echo 3900
Post by: Cut4fun on October 05, 2012, 02:04:48 pm

 
The only way to find out is running them side by side, once the muffs are unclogged most Echo saws pull good per cc.   Steve


I did run them side by side back to back.  ;)  Against a 025. No comparison torque wise with the 3900 having stock unmodded muffler still.  Thats why I said maybe they are closer to the 023.    I do like the feel and build of the 3900 better.
Title: Re: Echo 3900
Post by: 660magnum on October 05, 2012, 05:37:05 pm
I didn't change anything on the 025 but I was looking at the muffler yesterday and there is a big square hole under the cover that holds the screen.

The saw is rather loud and seems to have plenty of power.

Some of those 025 mufflers have a single round hole there and some have 3 or 4 small holes.

Then there is the wrap around baffle at the muffler inlet? I didn't removed the muffler to evaluate it.

I had the muffler off last year and it does have the four port engine like the 250 does.
Title: Re: Echo 3900
Post by: mountainlake on October 07, 2012, 08:38:15 pm

 Once the muffs are unclogged, most new Echo saws gain a lot doing that but have noexperiance with a 3900.  Steve
Title: Re: Echo 3900
Post by: Cut4fun on December 04, 2012, 05:05:38 pm
wooooohooooo    8)


Quote from: 67L36Driver;3971886
Fellow gave me this and I wonder if it is worth the trouble to fix.  Looks like lots of 'stuff' is broke.

.

Quote from: Cut4fun;3972071
I know what the echo is 3900.  Have had 2 of them and 1 with dead coil right now.


Many THANKS to you for the parts saw. The dirty looking 3900 is back up and running with the coil transplant. 

Parts saw arrived with good coil and  motor.  8)

(http://i59.photobucket.com/albums/g289/doemaster789/66Impala/3900partssaw001.jpg)
(http://i59.photobucket.com/albums/g289/doemaster789/66Impala/3900partssaw002.jpg)

Title: Re: Echo 3900
Post by: Cut4fun on January 22, 2013, 04:24:14 pm
Didnt realize there was a smaller trim saw in this family till someone ask about a echo 3600 36cc and I came across a echo cs-3600 IPL showing the 3900 too.  http://www.barrettsmallengine.com/partslist/echocs3600cs3900.pdf
Title: Re: Echo 3900
Post by: Cut4fun . on August 24, 2013, 04:09:25 pm
Muffler modded the older looking echo 3900 today.  Better but still not a 025 or 250 in the cut (  stihl is 45cc compared to echo 39cc). Still like the light weight for a trim saw though.

echo 3900 owners manual  http://www.echo-usa.com/getattachment/b180a1eb-51eb-42fd-a9eb-3c6c8b83f1c4
Title: Re: Echo 3900
Post by: mountainlake on August 26, 2013, 05:39:46 am
 
 The 025 has to be Stihl's best cutting lower grade saw, real close to  their 029 - 290.  A pain to work on though.   Steve
Title: Re: Echo 3900
Post by: Cut4fun . on October 10, 2015, 06:06:23 pm
https://youtu.be/lIAradeXX3s
Title: Re: Echo 3900
Post by: Cut4fun . on September 18, 2016, 03:41:49 pm
TTT to see if my parts saw 3900 had a clutch cover that isnt smashed.

New parts list.

Empty clutch cover no handle or brake parts

43300537931
Guard- Sprocket
More Info
Price:  $30.58

   Lever- Brake
Part Number: 43311137930
 $22.61


Then tons of misc parts.  To many to list

Brake band $6

http://www.ereplacementparts.com/echo-cs3900-chainsaw-parts-c-35043_35970_36725.html


Title: Re: Echo 3900
Post by: Cut4fun . on December 30, 2016, 06:37:22 pm
Another owner ask about his 3900 coil wire being cut in half and soldered back. Now wont start.   

I have repaired a coil wire that cant be removed before by splicing back together and wrapping in electrical tape and worked. 

You think the solder may be messing his up or could just be a bad coil.
Title: Re: Echo 3900
Post by: old 040 on March 19, 2017, 06:16:25 am
Hey Kev, have you seen the 3900 posted on C-list recently?, looks kinda close to you......
Title: Re: Echo 3900
Post by: Cut4fun . on March 19, 2017, 09:39:59 am
I've seen 2 others. 1 bad coil.  I'll go check and see if the same ones or not.

See none listed right now.
Title: Re: Echo 3900
Post by: old 040 on March 19, 2017, 12:04:07 pm
I've seen 2 others. 1 bad coil.  I'll go check and see if the same ones or not.

See none listed right now.
It's listed in the Akron section farm and garden, search under "chain saws"
Title: Re: Echo 3900
Post by: Cut4fun . on March 19, 2017, 12:32:33 pm
I've seen 2 others. 1 bad coil.  I'll go check and see if the same ones or not.

See none listed right now.
It's listed in the Akron section farm and garden, search under "chain saws"

Duh on me. Yeah that is one of the two. Been on there for almost a month.   

Heck I cant sell my good runner for $100 local.  So I just use it.

Echo just dont sell local.  Only 1 guy using them I take care of.
Title: Re: Echo 3900
Post by: Cut4fun . on May 13, 2017, 03:44:41 pm
Put 325 7T 16" on the 3900.   As I  wanted lightest saw to drop a dead 14" ash (emerald ash borer got it) and then limb it with. 



Title: Re: Echo 3900
Post by: Cut4fun . on August 02, 2018, 12:47:43 pm
Local text me (I know him) he is looking for a cheap small saw on a 100 budget. Told him got some cheaper and one right at that budget. Plus many more higher if he wanted to trade in bang bangs. ;)
Echo 3900 I been using around the house with 12" 3/8LP for myself for 7-8 years.
But now it is set up with what it came with .325 for him. So will see if he follows through and picks it up.

 Amazing how well it cleaned up. I used that WD40 spray on spray off once and then 2nd time spray on brushed and spray off. I'm talking it was pig in the mud dirty.