LuDookie
ArboristSite Guru
Hi everyone,
Seeking some advise....
I've got a fairly new, couple months old Echo CS680 that I've done a fair amount of cutting with so far. The saw has been great and hasn't given me the first problem, and cuts good, but I did notice something while getting it tuned in, and then stumbled upon some information on a thread here on AS that leads me to bring this up...I've read here about guys running 590's and them having a semi-fixed jet that will allow the saws to run with the H needle fully seated, not allowing the operator to lean them out enough in some circumstances. I live at nearly 9000 feet ASL, so everything runs a little fat up here. I always expect to have to lean things out. When I first cranked my 680 and began to break it in, it was definitely fat and sluggish, and "4 stroking" heavily at WOT. I began cutting with it and slowly leaning it out in the cut, gaining RPM's and strength to the point that the H needle is fully seated (and yes, the limiters have been defeated). The good thing is, the saw is very strong at this setting, even though I've backed it off a bit, and when you open the H needle the RPM's drop and so does the cutting strength. I also pulled the muffler and see signs of a rich run, and a very good looking piston, so at least I'm pretty sure I'm not lean. I'm running a tach on the saw and seating the needle gives me just above 12,000 RPM's WOT and anywhere around 7,000 - 9,000 cutting, only burbling a little when the RPM's raise in the cut (less pressure)....so, I'm liking the performance but here's my questions....
Does the 680 have the semi-fixed jet? It will definitely run pretty strong at 9,000 feet with the H needle seated.
I hear some responses to the 590 threads suggesting a rev limiter, but will a rev limiter come into play at cutting speeds? Seems like the burble I'm hearing(in the cut) at about 9,000 - 9,500 is "4 stroking". I am under the impression that the rev limiter is at max RPM if this saw has one....which leads to the next question....
Does the 680 have a rev limited coil?
I've had really good luck tuning and running a CS370, MS261, 385XP, and an old Pioneer, along with my weedeater and blower. The 680 is the first one to "bottom out" on the lean side. Fortunately I like where it's at, and it's better than being "bottomed out" on the rich side. And for the record, so far it is the coolest running gas powered tool I run now. I'm pretty sure I'm not toasting the saw, but I know you guys on here have a lot of knowledge on the subject.
Just looking for some reassurance, I guess.
Thanks in advance.
Seeking some advise....
I've got a fairly new, couple months old Echo CS680 that I've done a fair amount of cutting with so far. The saw has been great and hasn't given me the first problem, and cuts good, but I did notice something while getting it tuned in, and then stumbled upon some information on a thread here on AS that leads me to bring this up...I've read here about guys running 590's and them having a semi-fixed jet that will allow the saws to run with the H needle fully seated, not allowing the operator to lean them out enough in some circumstances. I live at nearly 9000 feet ASL, so everything runs a little fat up here. I always expect to have to lean things out. When I first cranked my 680 and began to break it in, it was definitely fat and sluggish, and "4 stroking" heavily at WOT. I began cutting with it and slowly leaning it out in the cut, gaining RPM's and strength to the point that the H needle is fully seated (and yes, the limiters have been defeated). The good thing is, the saw is very strong at this setting, even though I've backed it off a bit, and when you open the H needle the RPM's drop and so does the cutting strength. I also pulled the muffler and see signs of a rich run, and a very good looking piston, so at least I'm pretty sure I'm not lean. I'm running a tach on the saw and seating the needle gives me just above 12,000 RPM's WOT and anywhere around 7,000 - 9,000 cutting, only burbling a little when the RPM's raise in the cut (less pressure)....so, I'm liking the performance but here's my questions....
Does the 680 have the semi-fixed jet? It will definitely run pretty strong at 9,000 feet with the H needle seated.
I hear some responses to the 590 threads suggesting a rev limiter, but will a rev limiter come into play at cutting speeds? Seems like the burble I'm hearing(in the cut) at about 9,000 - 9,500 is "4 stroking". I am under the impression that the rev limiter is at max RPM if this saw has one....which leads to the next question....
Does the 680 have a rev limited coil?
I've had really good luck tuning and running a CS370, MS261, 385XP, and an old Pioneer, along with my weedeater and blower. The 680 is the first one to "bottom out" on the lean side. Fortunately I like where it's at, and it's better than being "bottomed out" on the rich side. And for the record, so far it is the coolest running gas powered tool I run now. I'm pretty sure I'm not toasting the saw, but I know you guys on here have a lot of knowledge on the subject.
Just looking for some reassurance, I guess.
Thanks in advance.
