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The shaft you are talking about is the crank.I would suggest you replace the saw because by the time and money it will cost to fix it a new saw will probably be cheaper.
Two things that can cause this problem. 1. Your carburetor is not set properly and is not letting the engine get enough fuel under a load. 2. Your chain is binding when you put the chain bar down on the log. Make sure your front chain sproket is turning free and is not too sloppy.
If it worked fine the last time you used it, then pull the spark plug and try pulling the rope. See if it's easier or if gas shoots out of the plug hole. I've seen this happen when the diaphram in the carb goes bad from sitting over winter. It loads up the cylider with fuel and makes it very difficult to pull the rope. If there is no fuel in the cyliner and it's still hard to pull, make sure there is nothing binding the clutch/sprocket. I've had chucks of wook lodged in there that caused it to bind the crank output, which resulted in a hard pull on the rope as well.
Start at 1.5 CCW from lightly seated then tune for performance like this: Carburetor Adjustment by Madsens.com http://www.madsens1.com/saw%20carb%20tune.htm CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly. Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run. There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH Lou
Ordertree.com (Poulan authorized parts outlet) http://www.ordertree.com/cms/contact-us/9790.html Telephone - For Handheld or Wheeled Products contact us at 1-877-500-7499
I looked at "Gas Chain Saw PP4218 Types 1 & 2" IPLs. there are no carburetor illustrations. I suggest you contact them by phone. Please have your saw and a supply of common hand tools within easy reach before calling. HTH
Lou
There are often multiple carburetor manufacturer's used on the same model. They can easily help you determine what is on your saw.
The carb low idle needs to be adjusted this is fairly common among the Poulan chain saws. Once you adjust the low idle from factory setting it will work
Try to adjust the air and gas intake pin. It is a screw type dial usually found sticking out the carburetor. You are tuning your carburetor, so you will have to test different adjustments until you get your desired running idle and power. I suggest you start with adjusting the air intake screws to decrease air supply going to the cumbustion chamber, It will probably make the chainsaw run when you give it a throttle.
You Likely by this time have resolved this. Mine messed up one day and I found a spring inside it. This spring wraps around the counter weights and pulls them together at idle speed, allowing the chain to stop, without stopping the motor. As you throttle it up and the RPM increases the spring allows the weights to push outward , engaging the chain. I have used mine without it, but I'm sure that would not be a recommended procedure, as the chain is always engaged, even when idling.
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