Muffler mod Echo 510

[Cliff R]

Since we were successful with the CS-360T, figured I'd open up one of the 510's to see if we could help it out some? I took the one with the most hours on it, and removed the spark arrestor screen and opened up the deflector a bit. The hole in the deflector was tiny, in comparison to the hole coming out of the muffler. My guess is that the restictive opening helps with emissions in some way, probably gives the stuff more time to react with the catalyst, not sure, but it's got to be to keep the EPA happy.

WOW, immediate noticable improvement! Ran a tank thru it cross cutting some old oak chunks to make them easier to split. That's about as hard as one can work a chainsaw, and it did a great job. We were able to competely bury the 18" bar without stalling it out.

Moving on to the CS-670 next, its pretty un-impressive for a 67cc saw with a piston ported engine. Our Husky 268XPS will cut circles around it. Maybe we can open up the muffler and get the performance level up a bit, it really needs something?......Cliff

 

[Bob Wright]

Cool...R U going to the Ohio GTG in April with them? If so hope to see you there...Bob

 

[Cliff R]

Bob, I'm new to this website, and have no idea what the "Ohio GTG" is? If it's some sort of big get together where dealers show up and you get to run the "latest and the greatest", I will try to be there.

I found out quickly when I started visiting this website, that it is much like a diesel truck website, where loyalties run DEEP for Ford, Dodge, and Chevy's, etc.

All of us are brand specific one way or the other, just like with our trucks. I don't see anything at all wrong with that, it's not my job to get anyone to quit buying Ford trucks, or Stihl chainsaws, for that matter. Just keep in mind that they both make some of the very best equipment you could want to own, and some of the very worst!

I had an opportunity a few years ago to aquire the entire line of Echo power equipment. We have a string trimmer, garden tiller, leaf blower, and the CS-301, CS-440, CS-510's, CS-670 and CS-8000 chainsaws. We no longer have the 301 or the 8000.

I kept the others and correctly tuned them, then commensed to put countless hours on them working them as hard as I can. I even loan them out frequently, to get abused by my very best friends. Not one single problem to date in any area with any of them.

The only problem I see with them, is slightly underpowered for the size of the engine(s). Now that I've found this site, and see where folks have made improvements to them with a few minor muffler mods, we're trying the same thing.

I'm not trying to wave the old Echo flag or anything, we've just been put into a position to use and evaluate a bunch of their equipment. I'm still very, very partial to my Husqvarna line-up, but starting to like these Echo saws, especially now that we are able to up the power levels a bit. If the information we post can help folks out, then it's worth the effort.....Cliff

 

[2000ssm6]

I removed the cat on my lil cs346, it was a dog to start with but picked up a little more power.

 

[Fish]

Cliff,
I have always threatened to come up to one of the GTGs, and I
may do it this one. I will probably be dragged out back and beaten, so
it might be good to have some family there. You still load your own
high powered .44 magnum loads?

 

[Cliff R]

Cousin Fish, we've got your back if you decide to show up and get into any troubles!

No, haven't done a whole lot of shooting in recent years, the carburetor business is keeping me too busy for a lot of recreational stuff. About all I do other than work is ride my Road King at every opportunity.....Cliff

 

[Fish]

Yes, I sold my .357 Dan Wesson after that reunion, I just couldn't get
enthused after watching your .44 magnums.

 

[Bob Wright]

Here is what Kevin sent me...Bob

Hey Bob, This is Kevin, aka Cut4fun.
I am having a GTG near Hayesville-Loudenville area off route 30. April 19th as of now. You can check out the specifics at http://www.########.com

 

[16gauge]

:
Moving on to the CS-670 next, its pretty un-impressive for a 67cc saw with a piston ported engine. Our Husky 268XPS will cut circles around it. Maybe we can open up the muffler and get the performance level up a bit, it really needs something?......Cliff

Please let us know how that 670 mod works out...I have a couple of them and think they have way more potential than they show stock.

 

[bgetchel]

New 670 Owner Needs Education

After going from a Poulan 18" "Wild Thing" to a Husqvarna 455 "Rancher" -- both of which were not up to the task, I just picked up a new Echo CS-670 from a local-ish dealer.

I've been reading about "mods" for various saws, including the 670, but have no idea what they are or how to go about it. I don't want to get into serious mechanical modifications, but if there is an easy way to replace or remove some simple parts I'd be all for it.

So, what is the easiest/best way to get more power out of the 670? I'm not very bright, so the more detail the better.

Thanks,

Brendan

 

[Cliff R]

Best advice I can give is to take "baby steps" with any and all modifications to the muffler or intake system, unless you have specific guidance from someone who has been successful with them.

We made 3 modifications to the CS-360T, running several tankfuls of fuel thru it after each mod. It has responded quite well, and no plans to take it any further.

We made 2 mods to the 510, pretty happy with it so far, may or may not go further with it?

Simply opening up any hole in the muffler, or adding holes, etc, may NOT work like we have planned. 2 stroke piston ported engines are very sensitive to intake/exhaust flow, restrictions in the intake system and back pressure in the exhaust system.

FWIW, I would start by simply removing the screen in the muffler opening. Then opening up the deflector a tad, then maybe a bit more, then possibly moving to the opening in the muffler itself.

When evaluating a modification, use the entire engine speed/load range. Some improvements to top end power may result in lost low end power, or poor throttle response, etc.

When we modify any engine here, we look for the most total power across the usable rpm range, not simply making the most possible power at really high rpm's......Cliff

PS: don't be fooled by noise, excessively LOUD exhaust doesn't mean squat for evaluating power production.