Thanks for the service info I will ues that on my next ajus adventure thanks again!here is carb adjustment data and service data. echo has not release a service manual for the 590 and 600 yet
Thanks for the service info I will ues that on my next ajus adventure thanks again!
Setting the "L" speed screw isn't at all difficult, but it may take a few attempts if you don't have a reference point because if more than about 1/2 turn rich or lean the engine will usually not stay running.
Once you get it to stay running at a low idle speed turn the "L" screw in or CW until it reaches the highest/smoothest rpms, then a little further till it starts to slow down/stall. Go out or CCW until you once again reach the highest smoothest idle speed, then slightly more until the engine slows ever so slightly. This is usually about the best place to end up at producing less tendency to hesitate with quick hits of the throttle, etc.
IF you are not able to get a stable idle no matter where you set the "L" speed screw, then for sure you will need to investigate and make repairs accordingly. When I run into this here in the shop we install a new fuel line, filter, and carb kit as mentioned above. Once in a while you will run into a carb that is defective and will not work not matter how many times you rebuild it, but that is not all that common. In most cases a good cleaning and carb kit with correct settings will take care of that deal Don't forget about the intake gaskets/boots and we always inspect and replace them if/as needed while the saw is here for repairs.
If that doesn't get it, it's probably got an air leak someplace else. Of course I ALWAYS do a compression test for very poor running/hard starting saws before throwing money at them, and may remove the muffler for a P/C inspection as well.
The "H" speed screw may require a little more effort than the "L" speed screw. I always go well out with those so the saw is noticeably rich, 4 stroking heavily and down on power in the cut. Start turning the "H" speed screw in a little at a time, making a cut with each new adjustment. Remove the load during the cut and the engine should instantly "four stroke" just a tad. Continue doing this until you find best power but it still misses just a tad removing the load. This setting will be ever more difficult to find as many modern saws will have rev-limiting coils in them which mimic a good carb setting. So best to er just a tad rich on the "H" speed screw but still making best power in the cut. It will take a little effort to find the "sweet spot" for the "H" speed screw, and you may have to make very minor adjustments to it for different weather, especially in the hot/humid summer months compared to the clean/cool dense air we often see in the Winter.........Cliff
In all the years I worked as a machinist and had to call for a maintenance guy, the best maintenance guys ALWAYS started out by checking the easiest, most obvious things. Saves headaches in the long run.Does your muffler have a screen. If so is it plugged?
Thanks guys for the awesome advice,I tried all of the above with exception of the compression test, vacuum test, fuel lines.im getting a rebuild kit for it and try that and check the fuel lines.let you guys know when I get it rebuilt trying to find the kit for it now .hda 268 walbro
K20-HDA. if you cant find it local give me a callThanks guys for the awesome advice,I tried all of the above with exception of the compression test, vacuum test, fuel lines.im getting a rebuild kit for it and try that and check the fuel lines.let you guys know when I get it rebuilt trying to find the kit for it now .hda 268 walbro
How do i go about getting that carb kit from you!K20-HDA. if you cant find it local give me a call
https://performanceoutdoorequipment.com/m/index.htmHow do i go about getting that carb kit from you!
How do i go about getting that carb kit from you!
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