Stihl 390 oil adjustment?

[woodhick]

My 390 is not oiling the bar very well.  It is putting out some but not enough.  How do you adjust the oiler  or is there an adjusment I can make without taking it to a dealer to do?  Thanks.

[sawguy21]

The oiler is not adjustable and that is a weak point on the 290/310/390 series. Without tearing into the saw, about all you can do is periodically clean the bar groove and use light winter grade oil. How long is your bar?

[woodhick]

I'm actually asking this question for a friend who is having problems.  But I also have a 390 and wanted to know if oil flow was adjsutable.  Guess not.  I am running a 20" bar not sure what friend is using but I will ask.

[59Billy]

There's an adjustment screw on the bottom of the saw. It's kind of up inside a recess and hard to see, but it's there. Turning it clockwise increases the flow. Sometimes if there's a little bit of crud in the valve, the act of turning it back and forth will clear it. (page 39 of the owner's manual)

As sawguy21 said, keep the bar groove good and clean -- also, the oil holes in the bar, and the slot on the saw that matches up to the oil hole in the saw.

Even properly adjusted, those saws don't put out much oil. Stihl say that their Oilomatic bar and chain plus their bar oil reduces the amount of oil needed. I'm still deciding if I believe that. ;)

[Kevin]

The 029 and 039 are adjustable.

[sawdust]

I have an 039, I have been having problems at slower RPMs. IF I can get her wound up I can cut. When i start up cold or hot it idles rough and I have a Dang of a time to get it up to speed. I have changed the filter out to no avail. suggestions?

sawdust

[leweee]

sawdust.....check the fuel line & impulse line for cracks or splits first
                 check fuel line filter next.

[sawdust]

will do. thanks!

[birchbark]

hello sawdust. i have a 170 for limbing and a290 for other cutting jobs. my 170 was losing power and eventually wouldn't even turn the chain. i checked air filter, fuel filter, and anything else i could think of. i took it to the dealer in leduc and he knew instantly what it was. there is a spark arrestor screen built into the muffler assembly.if you remove the screws holding the muffler on to the engine and remove the outlet louvers on the muffler the screen is right behind it. he told me i needed to mix the fuel a little leaner. i soaked the screen in some penetrating oil to remove the deposits and she runs like new again. none of this is shown in the owners manual, so i learned something new. so  you might want to check this on your saw. hope this tidbit helps you out. regards.

[Kevin]

It must have been really plugged.  :D
It's a gradual effect, you should notice that peak rpm can't be reached long before it gets that bad.
What mixture were you using?

[sawdust]

I use Stihl oil and mix it 50:1. I was told once to remove the muffler so I could look at the cylinder to look for scoring. The cylinder was and is smooth as a babies tush. When I reassembeled it i did clean those ports which were not terribly plugged and I left the screen off the muffler when I reassembeled. I'm sure this is a bad thing cause I know it tis a spark arrestor. Has not made a difference I will track down the impulse tube next. david