CS-590 not starting at High Elevation (7000')

[jradsan]

Hello, brand new here. Glad that there is a forum like this to help me figure out this issue! Yesterday i bought a lightly used cs 590 from a man that lives at 1000' elevation. I started and ran the saw there at his house and it was easy and fast to fire up. I brought the saw up to my house at 7000' Elevation and it is not firing up at all. I have removed the adjustment limit stops and set the L and H needles to stock adjustment after it would not start up. I have watched the videos that bobe8888 (who has a different name on this forum) on carb adjustment and running & tuning the saw, which are super helpful. Once i get the saw running i feel that i will have good information to go off on how to get the L set and then the H set while running in some wood.

Thanks for any help that you can put out there to get me going. I have been running chainsaws with my father for most of my life but this is the first saw that i am doing the maintenance on! Happy Sunday!

Jared

[DelawhereJoe]

When you adjust the carb are you trying to give it more or less fuel? I live around 46' above sea level, maybe less so I've never had your problem, when you have less air you need less fuel so tune it leaner. Just remember to richen it up when you come back down the mountain or bad things will happen.

[jradsan]

I have been trying it with less fuel. I went from were it was at and did a 1/4 turn CW to lean it out. I have gone from where it was all the way down to tight on both the L and H needles and then back out a little at a time to try to find something that will get it to start. I am getting wet fuel at the Decomp Button at times so i know that it is getting too much. but that is even when it is really close to bottomed out. I have also pulled the plug and seen that it is kinda black. I have checked Spark plug gap and confirmed that i have spark. Not sure where to go next....

[Ada Shaker]

R there any trees@7000 feet elevation?.

[dougand3]

I'd pull the carb off, remove limiters, then see where the H-L screws really are...2 turns out?, 2.5 turns out? Could be the limiters were removed and tuned rich by previous owner, so your lean tune is really fat.

[John Mc]

What shape is your air filter in? Perhaps it's partially blocked - not enough to cause a problem at low altitudes, but enough to thin things out to where it won't run at altitude.

[Andyshine77]

Before you try starting the saw again, make sure you clear out all the unused fuel from the cylinder. With the plug out pull the saw over a bunch of times, even flip the saw over and pull on her, I bet it's full of fuel. 

[jradsan]

Before you try starting the saw again, make sure you clear out all the unused fuel from the cylinder. With the plug out pull the saw over a bunch of times, even flip the saw over and pull on her, I bet it's full of fuel.

Thank you for everyone's replies, I have been working on it some more, still without success. I know that it is getting A LOT of fuel and i need to figure that out. I am getting fuel coming out the muffler after pulling a good amount. That is with the H and L limits at 1/4 turn and 1 1/4 respectively. I am not sure where i should have the Idle screw, and can someone tell me where the stock setting for that is? I am going to try and pull the plug out, drain the fuel in the cylinder then lean it out as much as possible and come up from there. 

What shape is your air filter in? Perhaps it's partially blocked - not enough to cause a problem at low altitudes, but enough to thin things out to where it won't run at altitude.

I took the air filter out and hit is with the compressor to knock any of the dust off of it. Thanks for the idea.

I'd pull the carb off, remove limiters, then see where the H-L screws really are...2 turns out?, 2.5 turns out? Could be the limiters were removed and tuned rich by previous owner, so your lean tune is really fat.

Stupid me starting messing with the tune after not getting it to start for a while and didn't take notice of what the previous owner had it at. 
The limiters were unmolested when i got to them.

haha... yes we are in an alpine forest with lots of different types of trees everywhere!
R there any trees@7000 feet elevation?.

[dougand3]

 I am not sure where i should have the Idle screw, and can someone tell me where the stock setting for that is?

No stock setting - once H & L are tuned, Idle screw is set where chain barely doesn't move. Trying to get it running - normal is to turn Idle way in (CW) = faster Idle.

You need to get the limiters off and see where it's set. I'd NOW set L = 1 turn out (CCW) from lightly seated and H = 3/4 turn out.

[Ada Shaker]

Sometimes the original settings can be found more or less as there would be less friction when turning the screws as the original settings would be bedded in, and the threads would be more worn out in this area. Use a small screw driver and you just might get the feel for it.