Question about Poulan PP4218AV 18" Chain Saw

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Wont start engine wont fire over has spark fresh fuel will no hit on starking fluid 130 psi compression

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  • Anonymous Nov 29, 2008

    Poulan Pro PP4218AV won't start. Started cutting up a tree and saw was running fine. Towards the end of cutting this tree the saw started to bog down and when idled it would kill. After restarting it was sluggish to accelerate. Saw quit running completely and now won't restart, tried spraying carburator cleaner directly in the cylinder and then into the carburator throat and not even a slight pop when cranking over.

    Has good blue spark at the spark plug gap, fresh gas, a clean air filter and compression.

  • ryelland Jan 25, 2009

    I have the exact same problem with m Poulan Pro PP4218AVHD. Please help.

  • 839545 May 12, 2009

    I recently had the same problem with my Poulan chainsaw. It would idle but would bog down and die upon attempts to accelerate. I rebuilt the carburetor thinking that was the problem but it continued to do the same thing. After several frustrating weeks of troubleshooting I finally decided to remove the muffler and attempted to start. The saw ran and accelerated normally so it was obvious that the muffler was mostly plugged and would not allow enough air flow through the carb when going to full acceleration. So remove the muffler and see if it idle and accelerate, if so, then simply clean out the muffler or replace with a new one. If not, then a carburetor rebuild may be needed.


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Remove the muffler and see if there is scoring on the piston.if ther is the saw needs piston and cylinder.sound to me that there is a lack of lubercation to the cylinder

Posted on Feb 11, 2009

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How do I fix a Stihl ts420 that won't start?

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probably because the third component to make an engine run is missing and that is compression
If it is 4 stroke then it will be a valve problem or rings--if 2 stroke it will be crank shaft seals or rings
If it is a 2 stroke ,then it is a good thing it didn't start because there is no lubricating oil in starter fluid

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It is getting fuel but has a weak spark and will not start.

DO NOT , I repeat do not use starting fluid on a 2 stroke chainsaw or trimmer. you will score the cylinder or the piston. When trying to diagnose a hard to start motor just give it a small squirt of mix in the carburetor. If it won't fire you have a compression problem or an ignition problem. when you test for spark make sure you have a good plug, that is well grounded and not in bright sunlight which can make it hard to see the spark. if you have spark, do a compression test.

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How old is ths fuel in the tank? If it is older than 2 months dump it and put in fresh fuel. Use some starting fluid sprayed into the carb and see if it fires on that. It may take a few sprays to pull the old fuel through the lines till the fresh fuel gets to the carb.

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Got fuel spark pressure still will not hit a lick

How old is the fuel? If it is more than to months old dump it out and put in fresh fuel. Have you tried a spray of starting fluid into the carb? If it fires up you may need to do this a few times till the old fuel is pulled thorugh the fuel line.

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I have a poulan pro 4218 it was running great when i put it away last year . went to start it this year put in fresh fuel i have a spark used starting fluid doesnt even try to start what gives?

If there is good fuel in the tank and there is a good spark, there is only two reasons why it will not fire up, the ignition timing is out ( sheared flywheel key ) or there is too little compression ( engine has seized at some time trapping the rings )

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Saw will not fire. has spark at plug and compression is 130 will not fire even with starter fluid

If there is fuel to the plug, and a good spark it should fire, all i can think of is the ignition timing is out due to a sheared flywheel key.

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Kia ora, i have a makita 2 stroke grass cutter, that just wont start, checked, spark plug, fuel, took it apart and cleaned it..still wont start. Please help, it does not have model number only product...

Engines need 4 things: Spark, compression, fuel, exhaust

1) Does spark plug have spark?
Take out plug, put plug wire back on plug, hold plug threads against metal part of engine, pull cord, do you see spark between plug and engine?

2) While spark plug is out, put finger over hole and pull cord. Do you feel suction that shows compression?

3) What about the exhaust port? Is the screen blocked with carbon deposits and dirt? Soak it in WD-40.

4) Do you have 2-cycle oil in gasoline? Do you have fresh gas? Did you leave gasoline in tank for several months? Is the carburetor clogged with gum?

5) What about the air filter? Does it fire up without air filter? Will it fire if you spray WD-40 into carburetor? Can you keep it going while spraying WD-40 into carburetor?
If it fires with WD-40 but won't keep going on it's own, then the gas is not getting to carburetor or carburetor is clogged with gum.

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1 Answer

Will not start. Spark ok tried with started fluid

Spark should be blue and snappy with fresh plug gapped at 0.020. Try putting some fresh fuel mix into the plug hole and try to start--it should pop several times. Does the engine seem to have good compression? If not, remove the muffler and check the piston skirt and cylinder wall for severe scoring. If it is, then the engine has probably be run on straight gasoline or poorly pre-mixed fuel/oil. At the very lean fuel/oil ratios ( 50:1) recommended for today's saws, proper premixing of fresh fuel and a modern synthetic oil made for saw use is imperative plus the fuel container should be vigorously shaken just before each filling. If the compression appears good, then check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for any decay or other damage. Make sure the carburetor fasteners are tight. Hope some of this helps!

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Won't start .is 70# compression enough. Spark and fuel ok. Took off carb and cleaned it. Doesn't even fire with small dose of starting fluid

70psi compression indicates it's rebuild time; the compression should be double that. You can confirm what the compression should be with good rings by putting a few drops of oil in the spark plug hole and testing compression "wet". That figure will be what a new saw would have.

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1 Answer


Have you done any work to the carburetor?Sounds like the carb. is dirty and needs to be cleaned. you may also need a carb. kit, depending on how old it is. If you need further assistance on how to do this, feel free to ask.


May 29, 2009 | Poulan PP4218AV 18" Chain Saw

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