20 Most Recent Echo CS400 18" Chain Saw Questions & Answers

Sure sounds like your fuel filter needs to be changed. If you can't blow through the filter with your breath then it is bad.

Hello Carl;
There are 4 parts manuals listed for a CS-400. I suspect the serial number is the key to the correct choice.
EchoUSA
http://www.echo-usa.com/documentation.asp
If your saw is not listed type "CS" in the “Model:” window, click "Search" and select your saw from the list provided.
I chose a parts list and a piston kit is available ($38).

I am going to close your other question also. The parts manual should answer most disassembly questions. If you hit an impasse these folk are extremely helpful.
ArboristSite Chainsaw thread (free to join)
http://www.arboristsite.com/forumdisplay.php?f=9
If you need additional help please do a search at the above site, most questions have been asked and answered. If you need to ask a question posting to an existing thread improves the odds of getting answered considerably.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Echo Chainsaw Repair (part #A056000210) - YouTube

? 4:01 www.youtube.com/watch?v=ctDATRlLqwk

Seals and or rings would not make the saw rev high. More likely the throttle is sticking open after it gets hot. Check throttle position and clean. Get a can of spray carb cleaner from auto parts or the marine store. Spray away till it's clean and check the throttle position again. RPM's only go up for two reasons, and they are both fuel air ratio. One is the throttle is open the other is momentary rev when the fuel supply is cut off.

try cleaning air filter and replace spark plug

Is the Chain brake engaged?

Check to see if the bar is bent [straight edge]. is the sprocket in good condition. Buy a good quality chain & keep it tight always

I will need more information. Will the chain stop if touched to a log? Is it just creeping along compared to the speed of the motor or matching the speed of the motor? Has the saw been used enough to have saw dust build up inside the clutch and keep it engaged?

no Primer bowl or Idle adjust screw side is input

File Size: 5/32"

small line should be the filtered line and go to the inlet side of the carb... single screw

There is a spring in the clutch that holds the pucks (pads) back, this spring gets week and will let the pucks engage the drum, the pucks should be tightly pulled in when you take the clutch apart, if not, you can try and take a few coils out of the spring, but this is risky, as the spring is in a weekend state and may fail again. best off to replace the entire clutch.(be safe)Jay poolmotorrepair Florida

It would be the side not screwed to the engine. Pull the air cleaner and there it is.

see the video attached and fix it God bless youhttp://www.youtube.com/watch?v=PJuBQcSvlXY#t=21