Echo cs 590,600,620 porting/mod/build thread

[Red97]

I dont see the taper hurting anything, you can make it flat so its a little easier .......... or you could just true up the piston with a small popup

I cut matching 3 degree tapers in this combo, it was easy with the compound

View attachment 15430 View attachment 15431

Very nice,

With this I don't really have the skirt length to make both piston and squish flat. Both have to be tapered.

 

[Moparmyway]

Very nice,

With this I don't really have the skirt length to make both piston and squish flat. Both have to be tapered.

We can only work with what we have been given !!

 

[BGE541]

Rattler portwd one of my 620s and in an animal... Even wider power band and very quick spool up but little room to drop the jug cause of free port issues

 

[jmssaws]

Free port is not necessarily a bad thing

 

[echoshawn]

Subscribed!!
Nice to see these getting some love without SawTroll bashing in the thread.
Curious to see how yours comes out Joe!

 

[Red97]

Free port is not necessarily a bad thing

Hmm, but how much is too much?

Just informed the 620 with a gasket delete is
In,75 ex 105 tr 124

Thanks @rattler

So looks like I will be raising the exhaust a bit more.

 

[jmssaws]

My 064 free ports a long ways and runs fine. It's not ideal but I haven't seen it hurt a saw yet.

 

[Red97]

This will be the next one I do cs490

Might actually be done first, shouldn't need any parts for a brand new saw...

 

[jmssaws]

I'm gonna get a echo to build a mean one from, what one do you recommend?

 

[Red97]

My 064 free ports a long ways and runs fine. It's not ideal but I haven't seen it hurt a saw yet.

I see, I guess since this seems like a high case compression saw, a lil freeport might not hurt.

But if I can get good compression numbers where I'm at then it won't be needed.

Thank you.

 

[Red97]

I'm gonna get a echo to build a mean one from, what one do you recommend?

Don't know, never ran one...

But the 60cc platform seems the most popular.

I'm trying to build as mean of an echo as I can right here

 

[rattler]

You very Welcome.

Sent from my XT1060 using Tapatalk

 

[rattler]

I'm gonna get a echo to build a mean one from, what one do you recommend?

620 makes a strong saw non limited coil and bigger carb.

Sent from my XT1060 using Tapatalk

 

[jmssaws]

620 makes a strong saw non limited coil and bigger carb.

Sent from my XT1060 using Tapatalk

Thanks

 

[echoshawn]

How's the availability of the 620 carbs and coils?

 

[Woodpecker]

I'm gonna get a echo to build a mean one from, what one do you recommend?

Carl did a pretty good job with the 2 cs500s he did here: http://opeforum.com/threads/miller-mod-saws-and-the-cs-500p-echo.421/

Pretty much the same saw as the cs490. It'd make for a pretty inexpensive build.

 

[bikemike]

The chamber is fairly small, and tear drop shaped. The plug is pretty much at the point.

Very small band, and tapered to match the one cut in the piston.

Definitely very different than most other 60cc I have seen.

I se a pop up working wonders in that jug.

 

[Woodpecker]

I stole this little gem of a brand new 490 off Fleabay for 250 to my door.

Saw bone stock and brand new in 12ish inch green wild cherry:

I pulled the tube from under the deflector and cut the front off of the deflector.

Nothing fancy but, I cut some simple gills on the other side of the muffler.

And now it seems much happier.

Good platform for a nice porting.

 

[Red97]

How's the availability of the 620 carbs and coils?

Good availability, fairly expensive conversion... 80$ coil 100$ carb.

 

[psuiewalsh]

I'm gonna get a echo to build a mean one from, what one do you recommend?

CS-1201