Question about Poulan Wild Thing 18" 40cc Gas Chainsaw - P4018WT

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Need air / fuel mix and hi and low idle settings for poulan preditor

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  • poulans crap May 11, 2010

    50 to 1 will burn up your piston and score the cylinder wall real fast. I use premium fuel and I mix a little under 40 to 1 to ensure the piston ,ring,and cylinder are getting enough lubrication. I adjust low end out 2 full turns,then adjust hi end at max rpm,at max rpm I then richen the hi side until the saw very slightly loses rpm.Improper adjustment will burn out a piston,ring and liner in a heartbeat. Hey, I may be wrong but I just cut down a 10 foot tall 53 inch diameter hard maple and shes still running.



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Your manual says 40:1 (1 gal premium/3.2 oz quality 2-cycle oil). If you are going to tweek it anyway use 50:1 (1 gal premium/2.6 oz quality 2-cycle oil). Clean the air filter first. Lou

Posted on Nov 15, 2009

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The air/fuel is 1&1/2 to 2 full turns out from being seated, then adjust for best operating performance in 1/4 turns then try it and readjust if necessary, the speed adj can be adj to your specifications

Posted on Nov 14, 2009


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2003 honda shadow 750 bogs unless you keep choke on

Hi, Anonymous and the usual suspects are:
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Hard to start, when i get it started it fine shut it off try to start it hard to start

General advice aplicable for all gas powered chain saws;
Clean air filter regularly.
-Adjust spark plug gap (very important). A faulty gap will either cause poor spark or a overloaded and damaged spark plug coil.
-Use correct good quality spark plug
-Use correct oil/fuel mix ratio and correct oil.
-Do not use old premixed fuel if you can avoid it.

Carburator adjustment;
-idle speed setting screw should be set so that the saw idles well, without engaging the chain. If you normally have to press the gas lever to be able to start it coul indicate a to low seting. Clockwise will increase idle speed. This screw is found near the carburator and is slightly larger the the two adjusment screws.
- fuel-air mixture screws can be set to standard factory setting as a start. Normally there are 2 screws labeled L and H, for Hi and Low rpm band adjustments. Factory setting are usually 3/4 turn out(anti clockwise) from fully closed setting for both (clockwise to closed position).
Experiment with adjustments by 1/8 increments at the time. Anti clockwise turning will increase fuel to air ratio and opposite. Warm weather will require a slightly leaner mix and cold weather will reqire a slightly richer mix(more fuel). Low rpm setting only serves the idling performance. The Hi rpm setting can be evaluated by removing the spark imediately after running at full load for a period. The spark plug should be dry, and be lightly brownish at the electrodes. White-ish color indicates low fuel to air mix, and this causes too high combustion temperature. A black colour indicates a too high fuel to air mix ratio, and it causes carbon build up on the plug.

If you still have starting problems, cylinder/piston compression is the next to check for. This is a more extensive job and should best be left to professionals, unless you are very skilled and have access to special tools required. Compression on modern saws are very delicately balance, so the slightest damage to either the rings, piston or cylinder can cause problems. Is is not alwas worth to replace the cylinder and piston kit, so compare prices and ask for advice at your dealer.

I hope this helps you.

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It will not run unless it is choked

sounds like it is running lean, increase your fuel air ratio and up the idle speed, both these adjustments can be made by jet screws wich are located on the carbuertor. You will need to consult your manual for the location of these. Also clean or replace your air cleaner and use fresh fuel with the recommonded 2-stroke mix. If you have no luck with the adjustments, increase your fuel/oil mix up richer.

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Hi I have a Poulan 3000 chainsaw that starts hard and wont stay running. Does anyone have a sevice manual? I am not sure where to set the carb adjustment screws to start (idle, low, high).

No service manual, but you should check the fuel filter, air filter, and muffler for plugging. Check the condition of all of the fuel lines looking for decay or other damage. Chances are that the jet screws are 'D' headed and can't be adjusted by the owner, only an authorized service shop has the necessary screwdriver. Be sure to have fresh fuel mix in the tank and be sure to shake the fuel can just before filling each time to prevent oil starvation. Don't make up more than a gallon at a time unless sawing is your business. Hope this helps!

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1 Answer


if using a good quality 2 stroke oil brand
mix it @ ratio 50:1 that is 100 mils of oil per 5 litres of petrol

or on a 1 litre basis it would be 20 mils of oil per litre
but !!!! if you are using generic 2 stroke oil from a garage
run it on 25:1 mix that is 40 mils of oil per litre of petrol

be sure to put required qty of in clean container 1st then add petrol qty to the can and give good shake , then fill your saw

cheers hope it helps


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First take a screwdriver and make a sign on it.Check and note how many turns are at Low speed ."L" adjustment.Then adjust High speed "H" at half a turn less than "L".Idle speed "T" adjust accordingly.
Start the engine.

best regards savumihai71

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