036 carb adjustment

[Rezarcher]

My 036 somehow got it's high and low screws out of whack just from sitting in the garage for a few days. I see the high is supposed to be 3/4 out from seated, and low is 1/4. My question is this: There are tabs on the screws that prevent them from being turned 180 degrees, do I simply turn them counterclockwise till they hit the opposing screw then turn them out the 3/4 and 1/4 from there?

 

[nmurph]

There is no way the needles just moved themselves. They have springs to keep tension and to keep them from moving. They can migrate a little over time when run, but not just chilling out in garage.

I suggest you take a dry-wall screw and run it into the end of the limiters. Then slowly twist and turn until the limiters pop out. Then take a razor and trim the tabs off that control how far the needles can turn. Tune the saw using the basic settings of one turn out on both the H & L side. Those settings will get you very close unless you have an air leak or need a carb kit. Once the carb is tuned you can replace the modified limiters to help keep the needles from moving.

 

[Rezarcher]

I typed that first sentence with sarcasm...sorry it didn't come out that way. Thanks for the tips, I'll give it a try.

 

[nmurph]

Yeah, things don't always translate over the keyboard.
Good luck.

 

[Rezarcher]

I guess I should describe how this came about in case someone senses there's a different problem. I use the saw 1-2 days per week for about 3 hours at a time. Over the course of about three weeks the saw would occasionally bog out either from punching the throttle from idle or while the saw was WOT going through a log. As soon as I let of the throttle it'd go right to idle and idle just fine. Then I'd have to pump her back up to achieve WOT. I might have this symptom one or two more times per use. I'm now playing with carb settings. I figure I've got it close but just wanted some opinions on here. If the high or low screw is out of adjustment, can I damage the saw?

 

[nmurph]

Acceleration problems usually come from a L needle that is too far in, and that is the first thing to check. But if a needle is going to move, it is usually going to back out bc of the tension of the spring. A needle can move too far and cause too much mix to be dumped into the carb and cause a flooding condition on acceleration. You symptoms could also come from worn diaphragms, collapsing fuel line or impulse line, or a clogged passage in the carb. Start with the simple stuff and work from there.