Echo cs600p

[petefrom bearswamp]

Bought this saw in 2007 or 8 and it has been nearly trouble free until this winter except for minor stuff, probably has 700-800 hrs on it.
My wife who names almost all of our appliances and my machinery named it little sir echo, after a song from my childhood
Wouldn't go to idle, just kept racing at high speed.
Took it to my local guy who rebuilt the carb, but same result after a short time .
Took it back and he tested for air leak all OK there, tweaked the jets and ran it OK for about a half day the the same thing.
He sold me a  new carb with the limiter caps and it wouldnt run worth a hoot.
I removed the caps and fiddled with the jets per his over the phone instructions but i cant make it behave.
I now have 35 bucks in the carb rebuild, 30 bucks in the air test and 100 bucks in the new carb.
Very frustrating.
Any suggestions or should I bite the bullet and buy a new saw.

[Pine Ridge]

Sure sounds like an air leak, except you got it to run alright for half a day. Either an air leak or starving for fuel. You might put a new fuel filter in it, and have a look at the fuel line, see that its not getting pinched or collapsed. I'm not familiar with echo saws but thats a couple things i would check. 

[ladylake]

 For sure check out the fuel line, that would cause it to race. If it will idle take some of the covers and bar and chain off and spray some WD40 or similar around the seals, carb boot, base gasket. If it slows down you have a air leak there.  Steve

[two tired]

Check vent, and also the gas cap

[DDW_OR]

my 2 cents
Carb cleaner
I used Seafoam on my Van with 118,000 miles.
had ruff idle before, now idles close to new.

going to try it on some atv's, and other 2 cycle engines.

Does not work on Diesel. wish it did

[lxskllr]

I'd get a new saw, but that's how I roll  :^P 


You currently have <$3/hr in this saw including all consumables and your goose chase repair(I'd consider looking for a new repairman). By just about any measure, that's a good return on your investment. If It was me, I'd get a new saw to use now, and slowly go over the cheap stuff on the existing saw. If you get it fixed, great! If not, you haven't wasted much more money and time, and work hasn't been stacking up.

[retiredmechanic]

not familiar with echo but it could possibly be a restriction in your fuel supply ie kink or filter restricted or air leak in fuel line what brand of carb was the original ? and was the base gasket and reed valve if used replaced? it sounds like if I read correctly that the original carb ran better than the replacement ? except for half throttle bog that sounds like starvation do you have a full tank of fuel? if running half tank fill it up and check again I have heard of echo saws losing the weight on the filter causing the filter to float and suck air there's too many things to check and your repairman should have checked everything besides just a quick fix and fast buck but in his defense i'm sure he believed it was fixed the first time. also while running, tip the saw left and right uo and down and if it changes it's highly possible it's a fuel line problem if not probably an air leak 

[petefrom bearswamp]

I have had good luck with this guy in the last 25 yrs or so,so trust him.
He did the air test and it showed no leaks.
both original and new carb are echo OEM, Walbro carbs.
I am going to fiddle with the jetting to see if I can make it run ok.
Oh I was wrong  the carb rebuild, and other tweaking it was 55 bucks not 35.