Question about Poulan Pro Chain Saw 46cc 20"

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How to reset chain brake has engine locked up after starting

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The chain brake has a centrifugaul clutch and will not stop the engine from running. Grasp the forward most handle (Hand guard) and move it toward the bar nose (forward). Did it click? If yes the brake was released. Pull it aft until it clicks, it may require a little grunt at the rear extreme to latch. Wear gloves and attempt to rotate the chain. If the chain can be rotated the brake is released. Can you pull the starter cord? If not the brake is not the problem. good luck

Posted on Mar 31, 2012

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The chain brake has a centrifugaul clutch and will not stop the engine from running. Grasp the forward most handle (Hand guard) and move it toward the bar nose (forward). Did it click? If yes the brake was released. Pull it aft until it clicks, it may require a little grunt at the rear extreme to latch. Wear gloves and attempt to rotate the chain. If the chain can be rotated the brake is released. Can you pull the starter cord? If not the brake is not the problem.
Starter Handle difficult to pull:
1. Remove the starter cover.
Inspect the flywheel and crankshaft under the starter cover. Are the woodruff key slots on the crack shaft and flywheel aligned and the key intact? If not; Please consider taking the saw to a good local saw seller/mechanic for a written diagnosis before authorizing any repair or ordering any parts; if yes continue.
Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if not repair the starter.
2. Is the saw equipped with a decompression valve? Yes continue, no proceed with 3.
Leave the ignition off, set the valve and pull the starter.
Pull gently to release the valve. Is there a difference in the effort required?
If yes continue with 3, if no repair or replace the decompression valve.
3. Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)? This may be caused by many things including but not limited to; leaky intake connections at the engine or carburetor; leaky crankcase seals; cracked fuel delivery lines; running on gasoline containing no 2-cycle oil.
Disconnect the spark plug wire and remove the plug. Remove the muffler (clean it and the spark arrestor before reinstalling), hold a light at the plug hole and inspect the cylinder through the exhaust port. Is it smooth and shiny or does it appear speckled with dull gray spots or smears?
Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges?
Hold the light at the exhaust port and look through the spark plug hole, inspect the cylinder above the exhaust port. Is it shiny and smooth or speckled with gray spots or smears?
Please Note: Any spots or smears on the cylinder or deep scratches and gouges in the piston indicate the saw was operated in a lean condition. Repair of this on a home owner quality saw often exceeds replacement cost. A repair estimate by an independent saw shop should be considered.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Posted on Apr 30, 2010

  • dontbother10
    dontbother10 Apr 30, 2010

    If the starter will not turn yopu cannot perform #2. Continue with 3. I think that is where teh problem lies.

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