Taking Stihl 025 to the mountains

[jotul8e2]

I need to take a chainsaw to our place in the Rockies. Fortunately, I have a spare Stihl 025 which has served faithfully for many, many years here in the Ozarks. I do not know its age, but it must be about 25 years old.

I anticipate it will be necessary to have the carburetor adjusted for the hight altitude; am I correct? I will be at 8600 ft.

 

[dougand3]

Higher altitude means less O2 and less fuel burns - therefore they tend to rich from lower altitude setting. I've read a general rule that both H and L screws go in - CW (makes leaner) an 1/8 -1/4 turn when you go up in mountains. Be careful and don't lean it out too much - better to be a little rich than a little lean.

 

[Mag Craft]

You will also have to raise the idle screw to keep it running at idle.

 

[Danno77]

Good advice above. Might not be a big adjustment needed, but to be optimal, tune when you get there. Also, I know this is weird, but I tune my saws in the fall because the temps are milder, that way they will work in either hot or cold. If you were a complete nutjob you could tune for the temp you'll be using it at, but I'd venture to guess that most people (myself included) wouldn't notice the difference. I just do it in the fall because it sounds like a good idea.

 

[highanddryinco]

Yep. I do it all the time. I go from about 5400 here in town to about 9800-ish up where the cabin is. 4 different seasons, different temps, different humidity, different density -- never the same. Dougand3 is right on. It's usually never more than a quarter turn and don't over-lean.

 

[jotul8e2]

Yep. I do it all the time. I go from about 5400 here in town to about 9800-ish up where the cabin is.

I do fine at our 8600 ft., but I doubt I could pull the starter rope at your altitude.

 

[highanddryinco]

Yeah, I often wish I had a mixture screw or two on me that I could adjust while up there.