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Saw starts, then stalls when you increase the throttle. Spark plug looks fairly clear. Ay ideas on where to look next?

My gas chain saw will start, but when I try to raise the throttle/speed. it will stall. The spark plug looked fairly clean, with some residue on it. Any ideas on where to look? r

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Yes, you will need to disassemble carburetor and clean with carb. cleaner. If you need tips on how best to do this, just let me know. Or you may need a new carb. kit.

Jim

Posted on Jun 02, 2009

  • Jim Parker
    Jim Parker Jun 06, 2009

    Did this solve the problem?

    Jim


  • Jim Parker
    Jim Parker Jun 07, 2009

    Thanks for the rating. If you should have any questions about "Drywall Finishing/Patching, or know someone who does, put your questions to "Category:Tools-Building & Power-Hand Tools" at FixYa.com

    Thanks Again,

    Jim


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Craftsman chain saw repair manual


Its not hard! You need to purchase a tool that goes into your spark plug hole. You remove the spark plug, put this tool in the hole. This tool stops the piston from moving so you can remove the nut holding the clutch. The clutch is what the drive sprocket is attached to. The drive sprocket is where the chain fits on at the engine side. remive the bar and chain and you will see the clutch. Use the tool and then use a wrench that fits the nut on the clutch. be sure you know which way removes the nut. It could be opposite of what you think. some are left hand threads some are not. I think these are not. After you replace the clutch be sure to lube the clutch bearings. Most people don't know this! use a grease gun made for saws and insert it into the hole at the end of the shaft that holds the clutch. Also next time your saw cant saw through a piece of wood, do not give it gas to make the chain try and move.This is what burns up the clutch! If your saw stalls out, and you press the throttle and it still doesn't turn. Always allow the chain to move, pull back and lift up on the saw slightly to get the chain moving again.

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1 Answer

I have a poulan pro pp4620avhd chainsaw. I can get it to start and stay running as long as I have the choke on. I can even run it at high speed using the choke control. When I pull the trigger to feed it...


Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

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Remove the spark plug when it quits to check for good blue spark. If ok, squirt some starting fluid into the plug hole, replace the plug, and try to start. If it pops a couple of times, then you have fuel problems. Check the condition of all fuel lines for decay or splitting. Make sure the air cleaner and muffler are not plugged. Check the fuel filter inside the fuel tank for plugging. If everything looks ok, then it is likely time to clean and re-kit the carburetor. Basic setting for both jet needles is 1-1/2 turns CCW from CW stops (lightly). If everything is in order, it should start and run. Allow the engine to warm up, then apply full throttle and adjust the H needle CW until it picks up speed, but still 4-strokes. It should immediately start 2-stroking when cutting. Allow to idle and adjust the L needle so that the engine idles fairly smoothly, yet allows the engine to 'follow-the-throttle'. Hope this helps!

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1 Answer

Describe your Husqvarna "Chain Saw -


Remove the spark plug and test for spark. If ok, try some starting fluid in the plug hole, install the plug, and try to start. If it runs a short time, it is not getting fuel. Check fuel lines including inside the tank. Clean or replace the air filter. If this saw is fairly old, the carburetor probably needs a re-kit and cleaning. Does it have good compression? Check the muffler for plugging. Make sure the fuel/oil mix is fresh. Good luck!

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1 Answer

4 y/o oulan chain saw hard to start and quit running, no spark.


TRY RUNNING AT HALF OR FULL WHEN IT DOES POSSLBY BAD GAS/MIX IF YOU CHANGED THAT ALREADY CARB PROBALY NEED TO BE CLEAN

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1 Answer

Poulan 18' model 2000 chain saw, quit running , will not start.


If you have a compression gauge, check the compression. Anything under 90psi is too low.

Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.

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Next:
Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

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1 Answer

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