Echo saws

[ChippersTreeSvc]

We use the Echo 341 as our climbing saw. They are really great saws and are light in weight

 

[ehp]

I myself donot use many aftermarket pistons and my reasons are I have had some fail , in a stock chainsaw that does not turn alot of rpms they work fine but on a motor that is turning more rpms the ring land fails or the piston material is not the same as factory so they run hotter and donot give the same power , yes a OEM part cost more but when it comes to something like a piston I will pay the higher cost cause when something like a ring land breaks its game over most times for the whole saw

 

[sharkey]

I broke the cs-670 down over the weekend and cleaned up what I could. The piston was smeared pretty bad but the jug cleaned up with acid. I didnt have another set of 1.2 x 50mm rings on hand. Cleaned up the lower ring and am only using that one until I buy the rebuild parts. Fired on 135psi compression. Will order an oem piston and set of rings. After running it alittle yesterday, I cant seem to get any 4 stroking out of it? I wonder if the carb was the reason for the failure?

 

[ehp]

most likely if it willnot 4 stroke you got either a carb problem or your sucking air some where

 

[sharkey]

Bad vent, completely stuffed. Compression up to 155psi on that bad piston with one ring. Cant believe it really thinking about how bad that piston was. What kind of static psi are these engines supposed to build?

 

[ehp]

you must have the jug cleaned up pretty good , it the jug is in descent shape and a good ring it will make descent compression 155 psi sounds about right but just about every gauge does measure different I have found

 

[sharkey]

EHP, do you remember what kind of piston was in the 680 you worked on?

Saw ran good today, still holding 155 psi cold on a standard mac tools gauge used for cars. Using 2T at 32:1 hoping to ward off any issues until everything is sorted. My question is about the piston I removed from the engine as it had a domed crown? No flat top on the dome at all, just a regular convex piston crown.

Made a few calls looking for parts and am being told that the new 680 piston is domed and the original serial range 3 series 670 piston is a flat top. Im also being advised that a 680 piston wont work in a 670 cylinder and vice versa?

Thanks Again.

 

[Maui Palm & Tree Care]

my vote goes for the 360T and the 341T in that order