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

[Woodpecker]

Wow cant thank you enough @Agent Smith! Ive been googling as much as possible the last day or so but its tough to know where to look

Welcome to the forum bud. I think you'll like it here.

 

[Hillbilly01]

Thanks for the welcome @Woodpecker! Seems like a good group of guys (and I'm sure some gals) with a lot of knowledge to learn from.

 

[Agent Smith]

Wow cant thank you enough @Agent Smith! Ive been googling as much as possible the last day or so but its tough to know where to look

Glad to help and those are just the tip of the iceberg. Theres many many threads with good info from the experienced members here to learn from.

 

[Red97]

Wow cant thank you enough @Agent Smith! Ive been googling as much as possible the last day or so but its tough to know where to look

Read this thread about 5 times lol..

It is my work, and I still come back to it for refreshers.

If you want a base gasket. Might as well order one now, or make one. They never are reusable on these saws.



Some info from page 2, from a 590. Most are in the same ball park. Best to check and be sure.

 

[Hillbilly01]

So I have been reading the info that @Agent Smith sent me, particularly the entire thread about compression figuring I would find the answer to my question on what is squish/the squish band, however I did not. While I appreciate you sending me your numbers @Red97, I unfortunately need to know more about squish, and even more so how to measure it so I can know how much to take off the base. When it comes to my knowledge of engine modifications, think 16 year old kid who has driven around in a parking lot once or twice but is now out on the road for the first time. I have a very basic understanding of how to make more power but not the specific minute steps to get there. Like, more fuel, combined with more air, pressed together real tight makes a bigger bang, which equals more power, but only if you get the exhaust out fast enough. And now you pretty much know everything I know! I kid, but you get the idea. Haha

 

[Agent Smith]

So I have been reading the info that @Agent Smith sent me, particularly the entire thread about compression figuring I would find the answer to my question on what is squish/the squish band, however I did not. While I appreciate you sending me your numbers @Red97, I unfortunately need to know more about squish, and even more so how to measure it so I can know how much to take off the base. When it comes to my knowledge of engine modifications, think 16 year old kid who has driven around in a parking lot once or twice but is now out on the road for the first time. I have a very basic understanding of how to make more power but not the specific minute steps to get there. Like, more fuel, combined with more air, pressed together real tight makes a bigger bang, which equals more power, but only if you get the exhaust out fast enough. And now you pretty much know everything I know! I kid, but you get the idea. Haha

This picture shows the squish band area and i measure them with .050 solder. Bend it in a L shape, stick it through the plug hole parallel to the wrist pin all the way to the cylinder wall and roll the engine over slowly. As the piston comes up and contacts the solder, it will squash it giving you your clearance number. Then take calipers and measure the squished solder. Theres your clearance number and then you can figure out what you need to do to adjust squish from there

 

[Agent Smith]

@Hillbilly01

Go on YouTube as there's videos there showing how to get squish numbers too

 

[Hillbilly01]

Awesome! Thanks so much. I just could think of something soft enough to bend through the plug hole that would hold its shape once the cylinder was brought down. Solder is a great call!

 

[huskihl]

Awesome! Thanks so much. I just could think of something soft enough to bend through the plug hole that would hold its shape once the cylinder was brought down. Solder is a great call!

You can get a small coil of electrical solder from the automotive Dept at Walmart for a couple $. I recommended the stuff there because I'm familiar with its thickness. Whatever you get, rosin core at .035 - .040” is about right

 

[Hillbilly01]

Unfortunately all I have is .032 and .06 diameter solder at home. You guys think .06 will work or too thick and I should try to get something closer to .04 or .05?

 

[Red97]

Unfortunately all I have is .032 and .06 diameter solder at home. You guys think .06 will work or too thick and I should try to get something closer to .04 or .05?

Twist the .032.
That is all I typically use. Your saw will likely be in the .045 squish range. But .060 is a real pain to squish

 

[huskihl]

Unfortunately all I have is .032 and .06 diameter solder at home. You guys think .06 will work or too thick and I should try to get something closer to .04 or .05?

Yep just twist the smaller stuff

 

[TreeLife]

I love when informative older threads get bumps by enthusiastic new members. Welcome to the Forum @Hillbilly01 !

 

[Hillbilly01]

Thanks for the welcome @TreeLife! Going to get to measuring tomorrow and ordering a gasket. I will start machining as soon as it arrives so I can have as little time down time with the saw since its my only one.... For now Really appreciate you all taking the time to respond on an older thread for a new guy.

 

[TreeLife]

Thanks for the welcome @TreeLife! Going to get to measuring tomorrow and ordering a gasket. I will start machining as soon as it arrives so I can have as little time down time with the saw since its my only one.... For now Really appreciate you all taking the time to respond on an older thread for a new guy.

New blood is important! Comment some, read lots, and experiment plenty, @Red97 is the echo whisperer and has been developing high performance Echo Hybrids utilizing stihl top ends. Theres a thread on them somewhere...

 

[Hillbilly01]

I definitely have been reading and watching a lot these past couple days. Plan on doing a lot more of it too!

 

[legdelimber]

Hillbilly01. Hope you enjoy the place.
Generally speaking, an earnest question draws the best responses. There are folks here with a world of knowledge.

Just my own opinion on things.
but I've always thought it was better to bump an old thread rather than starting a bunch of new ones.
It keeps the information, on a given subject, from being scattered all to heck.

 

[J. Dirt]

Got me a 590 apart on the bench now. So far it came with a scored piston and cylinder. Otherwise I don’t think the saw had hardly any run time! Anyhow. I think I salvaged the 590 cylinder and was going to do some playing with it.
I ended up with a 620p cylinder,coil and wrap handle. So I’m going to run it with that for a bit and see what it’s like.
Current progress...
Disassembled, new seals, bearings gaskets and such. New coil on and ready for piston cylinder and reassembly. My real question is about the crankcase. Are these echo cases bare metal looking like this one? Or was this from being straight gassed, on the first out?

 

[Red97]

View attachment 240577 Got me a 590 apart on the bench now. So far it came with a scored piston and cylinder. Otherwise I don’t think the saw had hardly any run time! Anyhow. I think I salvaged the 590 cylinder and was going to do some playing with it.
I ended up with a 620p cylinder,coil and wrap handle. So I’m going to run it with that for a bit and see what it’s like.
Current progress...
Disassembled, new seals, bearings gaskets and such. New coil on and ready for piston cylinder and reassembly. My real question is about the crankcase. Are these echo cases bare metal looking like this one? Or was this from being straight gassed, on the first out?View attachment 240578View attachment 240579 View attachment 240580View attachment 240581

Most all I have seen have been orange.

Getting ready to split a 2019, I'll look and see.

 

[J. Dirt]

Most all I have seen have been orange.

Getting ready to split a 2019, I'll look and see.

Let me know..... this one is a 2019 build as well.
Unless some one tried to run it on turpentine!