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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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Chainsaw wont throttle up dies out;cleaned out carb. relaced fuel lines .


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1 Answer

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Check the fuel filter, air cleaner, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Check for spark at the plug--it should be blue and snappy (gapped 0.020"). If it looks weak, try a fresh plug first--if still weak, remove the left side engine cover to expose the flywheel and ignition module. Turn the flywheel magnets under the ignition module, insert a thin business card into the pole gaps, loosen the module screws to allow the module poles to contact the magnets. Tighten the screws, and rotate the flywheel somewhat to remove the business card. Rotate the flywheel one complete turn to make sure the pole gap does not close up further. Reassemble and test for spark again. This process seems to have fixed a lot of Poulan saw problems. Finally, turn both carburetor jet screws CW to stops (lightly), then turn each 1-1/2 turns CCW. Start the engine and allow to warm up. Pull the throttle full on, and adjust H needle CW until the engine starts to speed up, but still 4-stroking. Correct adjustment is when the engine still 4-strokes when running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW until the engine idles fairly smoothly, but will still allow the engine to 'follow the throttle'. Adjust the idle speed screw so that the engine continues to run, but the chain doesn't try to turn. Hope this helps!

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Turn both screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and the engine should start and run. Allow the engine to warm up, then pull the throttle full on. Turn the H jet screw CW until the engine starts to speed up, but still 4-strokes. Proper adjustment occurs when the engine is 4-stroking, but immediately 2-strokes when cutting. This gives best power and lowest heat. Release the throttle and adjust L jet CW until the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

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1 Answer

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Check the fuel lines for hardness, cracking, splitting, or end rot. Check the muffler for plugging. Check the carburetor fasteners for tightness. Are you using fresh fuel mix? If the carburetor jets have been adjusted, try turning both CW to stops (lightly) then back out each CCW 1-1/2 turns. Engine should start and run--allow to warm up. Pull the throttle full on, and adjust H needle CW until the engine starts to speed 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 for fairly smooth running, but still allows the engine to 'follow the throttle'. Hope this helps!

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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

I own a McCullogh 610 Pro mac chain saw. Why does


Check the muffler to make sure that the spark arrestor screen is not plugged. Make sure the air cleaner is clean and not plugged. Turn both L and H mixture screws CW to stops (lightly), then back out 1-1/2 turns each. Warm up the engine, then open the throttle and turn the H needle CW until the engine speeds up, but still '4-stroking' but should immediately start '2-stroking' with light cutting. Release the throttle and adjust the L needle CW for fairly smooth idle, yet rich enough to allow the engine to 'follow the throttle' immediately when accelerated. Adjust idle speed CW until the chain starts to turn, then back off until it quits turning. Make sure the chain is being properly oiled and is adjusted for no chain droop, yet turns freely by hand. Hope this helps!

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1 Answer

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Is the chain being properly oiled? You should get a thin line of oil after running the tip of the saw near to a piece of paper or cardboard for moment or two. Is the saw getting overly hot after running? Clean the cylinder and air passages with compressed air if it is. Check the muffler for any plugging of spark arrestor screen. Turn both jet screws CW to stops (lightly) then turn both out 1-1/2 turns CCW for a basic setting. Pull throttle full on (after warm up) and adjust H for high engine speed, but 4-stroking that smooths out immediately when cutting. Release throttle and adjust L for fairly smooth idle, but rich enough to allow the engine to 'follow-the-throttle'. Adjust idle speed so that the chain stops moving. Hope this helps.

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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

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