Well that should hold idle but it still could be the carb. You never used a new one or a known runner yet did you?
You don't "look"at sealsPictures below. Compression was only 140 psi, but I don’t think the rings have set yet.
Piston looks clean to me yet.
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Tear down further to look at seals?
That should be enough compression and the piston and rings look good so I would rule that out. An air leak usually causes a high idle and can still run at high speed when the H jet is adding enough fuel . You say that it passed pressure and vac test so no need to tear it down as long as its tight. Fuel delivery is what I would work on next.Pictures below. Compression was only 140 psi, but I don’t think the rings have set yet.
Piston looks clean to me yet.
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Tear down further to look at seals?
It is still 2 stroke oil from the rebuild. I was pretty liberal when I put it back together. And then it sat for a month or two before I got back to it, so I out another small shot of oil down the spark plug hole to make sure it had oil before I started it. It has maybe 15 minutes of run time on it so it hasn’t burnt off yet. I have not added any oil to it recently.Got a question, what is all that wet liquid on the exhaust flange in the compression pics?. Did you use oil to get the compression reading?
I’ve had 2 different carbs on it. One I rebuilt, and one rebuilt by someone else. Same results. Possible that the same thing is wrong with both carbs.The high jet nozzle is not closing in the carburetors. You need a new carburetor. It may be replaceable depending on carb make and model.
No - I don’t have another 044 or similar saw that I could borrow one from.Well that should hold idle but it still could be the carb. You never used a new one or a known runner yet did you?
When you rev it up, does it hold the tune where the screws are set at? Usually an air leak will manifest itself when you hold the trigger down for a couple seconds and the RPMs will come up to the screw settings for a half second and then takeoff screamingNo - I don’t have another 044 or similar saw that I could borrow one from.
I think I will tear down, pressure and vac test again. Possibly change the intake boot and if it’s still acting up, then go into 1 or both carbs (again).
To me, it doesn’t take off screaming but I may not be holding it with the throttle pulled quite long enough. Mostly blipping the throttle to mid-range rpm’s to see if it will stay running to try to tune it.When you rev it up, does it hold the tune where the screws are set at? Usually an air leak will manifest itself when you hold the trigger down for a couple seconds and the RPMs will come up to the screw settings for a half second and then takeoff screaming
The flywheel key could be sheared which would let it run mid range but possibly not idle. Not saying the coil is good, but it is not common that they fail.To me, it doesn’t take off screaming but I may not be holding it with the throttle pulled quite long enough. Mostly blipping the throttle to mid-range rpm’s to see if it will stay running to try to tune it.
I have this posted on another forum as well (farming related forum but also good mechanics there). They are suggesting ignition problems. My only test is to check for spark, which it has cold. Could the coil be dropping out at low rpm? I used a business card to space the module off the flywheel.
No - I don’t have another 044 or similar saw that I could borrow one from.
I think I will tear down, pressure and vac test again. Possibly change the intake boot and if it’s still acting up, then go into 1 or both carbs (again).
I can try to get a video, a little hard with just a camera and needing 2 hands to start and keep the saw running.OP how about a video of this in action?
What setting are the H a L turned out to?
What do you mean it wont idle not even when you turn the mechanical idle up?
Leave both H and L at 1 turn out. Now there is a third screw down at the bottem this is the mechanical idle to raise the idle turn that in clockwise a bit and see what you get.I can try to get a video, a little hard with just a camera and needing 2 hands to start and keep the saw running.
High and low are both right around 1 turn out right now. Tried low down to 1/2 turn, up to 1 1/2 turns out. Haven't had it running long enough to adjust the high jet so its at 1.
Since I rebuilt the carb, I wasn't sure I had the idle set correct. so I turned it up some. When I say it won't idle, that means it will die unless I'm blipping the throttle.
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