My echo cs440 all of a sudden stopped running at high speed. Starts fine, Idles fine. Just won't run at speed. Air, fuel filters are clean, plug looks good. Choke works fine. Spark arrestor clear. I'll try the high speed needle next. That about right?
Garden - Echo - 30.1CC Chainsaw With a 14 In.bar and Chain
Answers & Comments
That is where I would go. Maybe carb clean or kit if it is a sudden change.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou