Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Echo => Topic started by: Cut4fun . on March 22, 2022, 08:04:45 am
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Always fun wheeling, dealing and trading saws, parts, bars, chains etc etc. All party’s happy. 😎✌️🍺
2021 490 that been ported. Was told maybe 20 tanks so far.
490 has spring assist start.
Ran a couple locals echo 4910 and sort of was wanting one to try out. Also was looking at echo 501.
Echo 490 has different piston and cylinder. P more like slab side 372. Quad port.
4910 501 p more like 440 piston style.
Reading 490 is a turd stock. But this one with just blind port work a local does seems to run pretty good.
But by Joe's dyno runs so does the 4910 501 stock leave lot on table to be fixed by porting.
NGK BMP8Y 15901019830
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Saving some of Joe Harkness info
The intake shape is the same, square with a triangle on the bottom
Square part is 71* very point is 82*
Ex, 114*
Tr, 125*
Squish .052 with .020 base gasket.
490 is the cheaper version of the 500. But still come factory with a rim setup
Going to clean up the transfer ports, where the filler block blends in 124/5. Raise the ex to 106-7 (about max before it breaks through the port roof)
Square up the intake a bit, still deciding if I want to fill the floor or not.?
Set squish to .018 7* band.
Don't think this piston lends itself to a popup. Tapered band with a slight dome. Plus the offset combustion chamber the popup would have to be very small diameter.
stock
https://youtu.be/SrtjLv3ys0Q
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Joe Red97
Ported 346 pushing 240 psi same stihl rs chain.
346 set at 14,200 echo set at 12,300.
13k max the echo hits a wall. Can't even get 13,050 lol.
https://youtu.be/aFT47_rkaQA
https://youtu.be/AtMVE0SUasI
https://youtu.be/Ashh6w4HDog
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Joe's test saw
stock vs ported times vs rs chain
Stock 2 cut avg= 23.5
Ported 2 cut avg (stock chain)= 15.5
+34.04% faster
Stock= 23.5
Ported RS chain= 14
+ 40.43%
Intake boot measurement 16.46mm
Throttle bore 15.83
Venturi 13.49
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Joe = Set at 12,900.
Full size 3/87 x16 stihl rs chain. My test log is getting bigger each cookie.
Limited coil for sure. Don't know how why who. 13,300 is all she Will go. If I turn the H screw In more it bogs out/falls on its face etc. Like 6-8k rpm.
https://youtu.be/A94V-x5zQlE
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Bell
https://youtu.be/OklIs9dRXbs
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Mitch with 500
https://youtu.be/CE-dgz0eq9A
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I pulled the cylinder etc off this one to clean it up some. Still some fine vertical scratching but no transfer was present.
I do not like their intake plastic slip fit clamp deal at all. I tried to use a 49cc-54cc poulan metal intake clamp but the echo intake was way to small for it.
Base needs to be cut to do right IMHO but going to dirko the base and test today, Dirko should take up the uneven area. Then will test for leak.
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2 of us had same idea to try for the echo 4910 490 500 501 air filter problems. Here is a simple fix and no fins.
I couldnt find one that fit out of my to boxes of them. But Corey (he is from my CRG FB and one of the admins) had one that fit perfect. Been testing them with picco 3/8LP 7T , full 3/8 7T , 325 7T and 325 8T and he said no fines got by now.
Here is my 490 with 18" 3/8LP and 3/8 full 16" and a 12" picco too.
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Got the air filter fix in. Hopefully no more fines getting by like Corey seen with his 4910 fix.
You finding fines in your carb throat from getting by air filter on this series echo? Just curious. Most folks find them on 490 4910 501. I did too.
Easy fix in pic. Stops it.
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Little blind ported echo 490 I took on trade. Doing what I wanted it for light saw for limbing etc.
Still running the picco 3/8LP 7T on it. Stihl 63PS chain on poulan bar mount is perfect. A or K 041 depending on 3/8 325 3/8Lp
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3/8LP 3/8 7T rim 18" oak
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Just because 490 was jelly of the 501 4910 mufflers. 🤦♂️😂
Little guy is a limber for sure. Did a maple the other day with it.
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Little 490 was able to do all my storm clean up, flawless. Just glad none of the big trees went down like folks had all around my area. EF1 was down for 7mins south with 105mph winds.
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Set my little 490 up so a guy could borrow it to run in the Ohio Sawfest events. He was missing a 0-54cc saw for class. Has to be 325 chain round filed for that class. Others 3/8 and round. Took spike etc off too.
Since I dont do this racing stuff anymore told him he could borrow saw for that class.
It wont place but gives him hotstart hands on wood and 3 cuts practice for his own saws later.
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Man this thing is slow slow slow. About fell asleep making 3 cuts.
325 round filed to be hair quicker 8T
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Putting together a list 501 4910 stuff for 490 upgrade. Some not needed.
Shindaiwa Boot - A202000150 $10.88
Echo Assy, Decompression Valve - A014000110 $42.34
Echo Carburetor - Wt-1141 - A021004570 $100.79
Echo Cylinder - A130002280 $127.69
Echo Piston Kit - P021048650 $60.47
Echo Coil, Ignition - P021037431 $92.73
Echo Holder, Bellows - A206000030 $2.99
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Found my old pic of which 272 o-ring to use. One on right.
Echo 501 4910 490 air filter fix.
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O-ring air filter fix works like a charm
Cant kill this hacked on echo 490. If it starts the air leak I sealed at base gasket area where I used dirko for base gasket. Then I can take to local guy to turn the base for me where local hack fubarred base with grinder.
It's the one I got in year or so back in with air leak issues and guy left crap in cylinder transfers from self porting. Had to clean that all up and seal base up.