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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I installed new carb. on my tecumseh 5hp. snow king and it wont start. I have spark and gas is flowing out of carb.

This can be very frustrating and tough on the back and arm.
Always confirm the the fuel tank valve is open and the stop/run switch is in run position

It takes three things to run:
  1. Compression. This is the resistance that you feel as you crank the engine. Some engines have compression release to assist getting the rotation started. You should be able to feel the compression stroke as you rotate, Remove the plug and you can easily tell the deference. If it had, last time used, been running and starting with no problem I would assume that the compression is OK. Gauges are available to check. at lease 120 PSI
  2. Spark. It is near impossible to lose the spark timing on these. It can only be magnitude and presence. If in doubt about the condition of spark plug replace. I usually lay the plug on top of the head with wire attached and observe for the spark. No spark no start.
  3. Confirm that the throttle is in the wide open position. It is possible during the repair the spring or rod has closed the throttle air valve. Air/fuel mixture is always hard to trouble shoot. I use open choke and starter fluid to conform that compression and spark are working. After that I will choke on a cold motor and pull listening for the first fire. At the first fire I would usually half choke and pull to first run. Full choke for many pulls will only flood engine!! If no joy then I would allow engine to vent and go back to start fluid. If it will run on start fluid than either carburetor is messed up or quality of fuel is bad.
If after several tries and fuel is certain to be good remove plug and check for gas. It is possible that the new carb float valve or mixture adjustment screws are messed up.

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Has spark fuel and 125 compression will not start?

Use a small amount of starter fluid in the intake past the filter. If the engine fires than you can be confident it is a carburetor problem.

Check for water in the gas

The carb cleaner may not be volatile enough to support ignition. The over the counter starter fluid is easily ignited even in cold weather.
If the engine has been in storage with old gas it is likely that residue has formed in the carburetor. If it does fire up with stater fluid but will not run with full choke it will most likely require a carburetor cleaning.


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1992 suzuki 750 it's got spark but won't start, what could it be?

engines require three things, spark-at the right moment, fuel, and compression. If you're sure you have a strong and consistent spark, move on to your fuel. Drain everything you can and start with fresh NON OXYGENATED (no alcohol) fuel. In recent years 1/2 the troubles I see is from poor quality fuel. I spray a shot of starting fluid into the airbox and if the bike starts or at least coughs that tells me I have a fuel problem. Last but not least perform a compression test. The psi isn't as important as each cylinder should be with 7lbs of the rest.
After an attempt to start, pull the plugs, are they wet or dry? If wet crank the engine over for 20-25 seconds with the plugs out and re attempt a start choke off and a light shot of starting fluid. Give this a look and report back your results. Good luck

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My 2004 suzuki volusia VL800 cranks but won't start. I checked the fuel pump and it pumps fuel.I checked for sparks and it sparks. what could be the problem?

I always go back to the basics. Fuels, spark, compression. Try a shot of starting fluid spray into the carb immediately hitting the starter, if it starts and dies the problem is fuel. If it doesn't even spit or try, it's ignition. Gasoline nowadays is poor, shelf life maybe 3 months. Use absolutely fresh non oxygenated (10% ethanol) premium. Spark plugs can fire out of the engine easier than when under compression. I use a dandy home made tester, a spark plug attached to a battery clamp which easily grounds to the engine. Use a healthy .050 gap to see the spark is strong enough to jump the distance. After you try to start it, pull your plug. Is it bone dry or wet? That'll give a clue. If all else fails it's time for a compression test, and determine if your spark is happening at the right moment. Re try your efforts first as described, get back to me with your results, and best of luck.

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1 Answer

03 suzuki 2.0 no start 40 psi fuel pressure 90 psi compression spark present will start/run if fed starting fluid to throttle body

sounds to me that the ecm is not telling the injectors to fire. is the check engine light on? if so, have the codes read.

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1 Answer

Engine wont start it is getting spark and fuel any other reason why it won't start

You need 3 things for an engine to run; spark, fuel and compression. How is the compression? Is the spark plug new? If the plug is old, it could give a nice spark when you check it but have no spark under compression. Make sure the fuel you're using is fresh. If you give it a small shot of starting fluid and it fires up, your fuel delivery is suspect. In that case, you will need to remove the carb an THOROUGHLY clean it paying close attention to jets and passages. I always give people this warning: when cleaning jets and passages, NEVER use steel instruments. Use wood, copper wire or other materials that are softer than the material you're working on or you run the risk of ruining jets or even the entire carburetor.

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2 Answers

My stihl fs 350 wont start at all any sugestions ?, thanks from mark uk

I would have a shop do a compression test on the engine. It should be at least 100 psi to run. And then a spark test on the ignition module to see if it firing to the spark plug. I would look at a carburetor rebuild. I would also mix up some fresh fuel mixture; anything over 30 days now is considered bad gas.

Sep 30, 2009 | Oregon Scientific Complete Carburetor for...

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

2 Answers

"my dt125 is trying to fire but struggling

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