Starts right up but only runs wide open. wont idle down and linkage seems to be working fine
Your question isn't detail enough such as.
Q: It starts up wide open with the trigger depress fully but when I release the trigger it dies.
A: The carburetor idle jet (Picture A item #27) is dirty/plugged. the carburetor needs to be taken apart and cleaned or it just needs to be turned out a bit to flow fuel or the idle screw that sets the idle speed (Picture B) on the carburetor need to be screwed in to open the flap a bit more. Your carburetor may not be like either of these two carburetors but close enough. If you need to figure out which carburetor you have to locate the idle jet look search for picture of your carburetor and that tells all such as in picture A.
Another couple things. In picture B you see the spring on the throttle shaft that closes the flap to idle. If that area is really dirty the flap could be stuck wide open. Make sure the it is free to open and close. If the chainsaw has had a lot of use the engine could be wore to the point at idle the piston isn't making enough compression for the engine to stay running even if you turn the idle speed screw (Picture B) in as far as you can.
SOURCE: idle to high
Make sure the carburetor was re-installed correctly as any air leak between the carburetor and cylinder will cause high engine speeds but almost no power. It can also scuff the piston/ring(s) and cylinder due to very lean lubrication from the fuel. Hope this helps!
SOURCE: My echo cs440 all of a sudden stopped running at
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
SOURCE: homelite timberman only runs wide open
Start with "H" and "L" at 1.5 turns CCW from lightly seated then tune for performance as follows:
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
SOURCE: my 455 starts good and idles fine but wont go wide
Husqvarna recommends 50:1
1 gallon of premium fuel to 2.6 ounces of quality 2-cycle oil.
Lou
Clean the air filter and spark arrestor (muffler)
Try turning the "H" sdrew 1/8 turn CCW, if no better 3/16 CW.
this explains needle valve adjustment better than anything else I have seen.
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. HTH
Lou
2,581 views
Usually answered in minutes!
×