Stihl 009L VERY Hard Pulling to Start

My tree and trail saw, a Stihl 009 has become almost impossible to pull. Ran perfectly until a month ago.
And yes, according to the chainsaw dealer and Bruno the logger ( no longer a friend ) " I'm pulling weak".
Here's what's been done with not much success:
1.Rope and pulley mechanism are fine. Pulls easy without the plug in.
2. The muffler and screen were cleaned.
3. Poured acetone into the carb, shook it around, then emptied the carb.
4. Plug is clean and gaped correct with spark.
5. Pulled apart the saw and thoroughly cleaned out years of oiled sawdust.
6. The choke mechanism works fine.

Finally--poured some mix into the cylinder (plug hole ) , swished it around for a few minutes and it pulled easy and started...once.

Suggestions ? Explanations ?
I really like this top handled saw for what it can do. Discontinued by Stihl.

 

Hey, where are all the experts ?
Needing some help here !
HEEELLLLPPPP

 

Maybe in bed?

 

It's only zero dark hundred on the left coast.
Everyone else: IT IS TIME.

 

Did you or are you able to look at the piston through the exhaust to check for scoring ?

 

Yup, but looks fine for what is visible.
The "inconvenient truth" ( thanks Al ) is that I'm not sure what to look for as "scoring".

 

This is a WAG . But, Can you look at the upper part of the combustion chamber . There could be a build up of carbon there . Maybe causing a rise in compression ,and resistance to being pulled over ?

 

Et voilà ... encore une fois
TLA..."WAG".

 

Make sure that flywheel isn't hitting anything.....like the coil.

Make sure chain brake is free.

Sent from my moto g(7) using Tapatalk

 

Eat some wheaties before you head out in the am?

 

Quit pouring stuff in the carb. Is this the brake fluid saw ?

 

??? Brake fluid and rubber can be a bad combination. It swells rubber.
You know the old trick for things like a leaking power steering pump seal = add some brake fluid and it swells the seal and stops the leak.

If it is the brake fluid saw ( and I don't know this ) maybe a swollen crank seal or two ?

 

My MS250 did the same thing around a year ago. It was all I could do to pull it through the compression cycle.
I did like you and pulled the plug. Pulled a few times with the the plug out. Pulled fine. Put the plug back in and it started as normal. Been running fine ever since.
What was a wrong beyond me. The only thing I could figure out is it hadn't been started in 4 months. Could the cylinder been dry out?

 

Wasn't too long ago I had an 011av on my bench. Very pesky little buggers to work on.
These are carbon streaks. If you have an overly excessive build up of carbon, it could increase compression, though I doubt to the point you have a hard time pulling the saw over.



Here's scoring:




If you can't keep her running, I'd ask when the last time was that you changed fuel lines and rebuilt the carb with new diaphragms?

 

Wild _ssed Guess .

 

Pull the plug and then pull it over. What’s that like?

 

Fine pics....thx. Are those the "scorings" to find ?
Never rebuilt this carb or changed fuel lines.
Due to ham hands and sticky fingers as well as a lost brain that forgets where things "go" I will never again rebuild a carb. Never.
You got to know what you can't do well ( and, know what you can do ).
P.S. "Pulls easy without the plug in " from O.P.

 

I remember reading about another Stihl...larger, don't recall the exact model, that was acting the same, ended up being something wrong with the recoil starter...don't know that I ever heard what the exact problem was...might be something to look at though.

 

Recoil starter mechanism is fine. Pulls and retracts easy and normal with the plug out.
The rope rewinds correctly.
The 009 is small and barky enough so that it can easily backpacked, climbed, and used to get into a mess of blowdowns so that I can get to the trunk with the 261.
Thx.

 

Maybe it's time for a small saw like that with a decomp plug to assist you in starting it. I didn't have the 011 apart enough to know if one could be added. Some saws that is possible.