Saw running poorly after deep clean

[revving13500]

Yesterday I took apart the clutch to repair my oil pump and cleaned everything out during the process. I also ended up pulling the carb and giving it a light cleaning and inspection (everything looked fine). Now when the saw is idling it very slowly drops in RPMs until it shuts off. If I hit the throttle the saw will stick around 3000 rpm’s for about 30 seconds or so and then begin dropping again.

I pulled the carb back apart and everything was put back together correctly. Not sure what’s causing my issue now

 

[lone wolf]

Yesterday I took apart the clutch to repair my oil pump and cleaned everything out during the process. I also ended up pulling the carb and giving it a light cleaning and inspection (everything looked fine). Now when the saw is idling it very slowly drops in RPMs until it shuts off. If I hit the throttle the saw will stick around 3000 rpm’s for about 30 seconds or so and then begin dropping again.

I pulled the carb back apart and everything was put back together correctly. Not sure what’s causing my issue now

Did you blow high pressure air through the carb ?

 

[ballisticdoughnut]

Did you blow high pressure air through the carb ?

I know where your going with this question lol. Check valve has left the building?

 

[The Stig]

Is the choke on

 

[revving13500]

Did you blow high pressure air through the carb ?

Nope, just a quick spray with some carb cleaner

 

[revving13500]

Is the choke on

The choke is disengaging so it’s not that either

 

[ballisticdoughnut]

What make and model of chainsaw is it?

 

[revving13500]

What make and model of chainsaw is it?

Ah jeez can’t believe I didn’t put that in the post. Stihl 044

 

[ballisticdoughnut]

Make sure the pulse hose is hooked up. The one poking through the back side of the tank housing. It’s at like 5 o’clock position looking into the intake boot with the carb off.

 

[coffeebrk]

Why did you take the carb off in the first place? Was it running OK before you "cleaned" the carb?

 

[lone wolf]

I know where your going with this question lol. Check valve has left the building?

Sounds like a vac leak ,pressure test the carb and the saw.

 

[stihltech]

Continue the diagnosis. Anything visible cracked or leaking? Fuel clean? Cylinder and case screws tight?
On a saw of this age all rubber parts are suspect. Don't fire the parts cannon until the diagnosis is done.
A carburetor can only control what goes through it, not what comes after.
This is why we preach a vacuum and pressure test. Not a suggestion. A MUST!

 

[farmhard]

Is the sleeve still inside the intake boot behind the carb?

 

[NSEric]

My 2 cents.
If you had adjusted the carb to make up for it being a little plugged up before cleaning it then cleaned it, you are now running a little rich.
Turn the low in a little and try it.

 

[telecasterfool]

It sounds like the fuel at idle is incorrect. Possibly because the tune is wrong as suggested - low jet - or because of an air leak, etc. I would try to tune it correctly and see how it responds. It may be loading up from too much fuel on the low jet. If 1/4 turn to the right fixes it and, and everything else functions correctly, that was it. This is what a "normal" properly functioning saw would do. If it doesn't respond correctly to tuning, something else is wrong. Do you have a good amount of tuning experience? if not, find someone who does. good luck

 

[lone wolf]

It sounds like the fuel at idle is incorrect. Possibly because the tune is wrong as suggested - low jet - or because of an air leak, etc. I would try to tune it correctly and see how it responds. It may be loading up from too much fuel on the low jet. If 1/4 turn to the right fixes it and, and everything else functions correctly, that was it. This is what a "normal" properly functioning saw would do. If it doesn't respond correctly to tuning, something else is wrong. Do you have a good amount of tuning experience? if not, find someone who does. good luck

Just set the H and L to the stock setting 1 turn out each, if it still isnt better is something else.

 

[PV Hiker]

Yesterday I took apart the clutch to repair my oil pump and cleaned everything out during the process. I also ended up pulling the carb and giving it a light cleaning and inspection (everything looked fine). Now when the saw is idling it very slowly drops in RPMs until it shuts off. If I hit the throttle the saw will stick around 3000 rpm’s for about 30 seconds or so and then begin dropping again.

I pulled the carb back apart and everything was put back together correctly. Not sure what’s causing my issue now

Most often the cause to problems is the last work that was done. Sounds like it was running fine before carb cleaning. Go back through the carb and assembly. The clutch - oil pump assembly was fixed / cleaned, was it removed and could the seal been compromised?

Re visit all the things you touched and the associated components in the area that could have been damaged and not known. Vacuum and pressure test the saw. Re-read the posts that came before, some good advice.

 

[revving13500]

Most often the cause to problems is the last work that was done. Sounds like it was running fine before carb cleaning. Go back through the carb and assembly. The clutch - oil pump assembly was fixed / cleaned, was it removed and could the seal been compromised?

Re visit all the things you touched and the associated components in the area that could have been damaged and not known. Vacuum and pressure test the saw. Re-read the posts that came before, some good advice.

Man I feel like an idiot. Finally got the tools to do a vacuum test. Hooked it up to my carb and it was leaking pretty good. Took 10 seconds to make sure all the bolts were snugged down good and voila, no more leakage! Fired her up and she’s running great again. Glad I at least have a kit for vacuum testing now. Thanks for the help!

 

[farmhard]

Kudos to you sir for following through! It's a great feeling to find the problem even if self inflicted lol.

 

[revving13500]

Kudos to you sir for following through! It's a great feeling to find the problem even if self inflicted lol.

Excited to mess more stuff up and learn how to fix it