Question about Poulan Pro Chain Saw 46cc 20"

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Fuel mix adjustment screw fell out

Found part & put it back in need to know proper adjustment for it

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  • cuzzmo Dec 17, 2008

    Right on the money!

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Hi

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

Posted on Dec 10, 2008

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2 Answers

I have apolandpro46cc 20inchchain saw it will start but it cuts off and will not idle


In sequence:
First, if it has a "torch" plug, toss it. Go for BM7A NGK.
See that nothing has come loose- carb & thereabouts.
Dump fuel & put in FRESH mix.
Carb may need adjustment.
See that ignition switch lead and switch are not intermittently shorting.
If all else fails, do a vac/press test- could be crank seals.
More info up front makes it simpler.

Jun 27, 2014 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Hard to start, when i get it started it fine shut it off try to start it hard to start


Hi
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.

Feb 25, 2011 | Poulan P3416 16Inch 34cc 2Cycle Gas...

2 Answers

Can you help me please. i have a stihl ts400 I start it up and put the choke off then it stops and even if i leave the choke on it only goes for a few second then cuts off.


inspect the fuel filter located in the gas tank o the pick up line
inspect the diapghram on the fule pump located on the side of the carb, you will see the gas line going to it.The fuel pump works on a vacuum system from the cylinder so the diapghram may have a pinhole or cracked.Also low compression will not allow it to work properly, also check lines for partial blockages.All else fails, clean te carb and blow out ports with air.Hope this helps

Jan 21, 2011 | Chainsaws

1 Answer

Husqvarna 340 chainsaw will only run for a few seconds on choke, tried cleaning carb, carb adjustments do not help. will not run at all with choke off.


Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other problems. Make sure that you have fresh fuel mix in the tank (50:1 ratio). Mix the fuel/oil in it's own container and shake the container thoroughly just before adding to the tank each time to prevent oil starvation. When you were cleaning the carburetor, did you check the condition of the lower diaphragm for flexibility with no holes or cracks? Turn both jet screws CW to stops (lightly), then back each out CCW 1-1/2 turns. Start the engine and allow to warm up, then pull the throttle full on. Adjust the H jet needle CW until the engine starts to speed up. Proper adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW for better idle, but allows the engine to 'follow the throttle'. Hope this helps!

Nov 07, 2010 | Husqvarna Chain Saw 20" Bar

1 Answer

How to adjust idle on McCulloch Mac 2214av chainsaw


Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. . Start with 1 1/2 turn out from all the way in. Be sure the filter is clean, You can use starting fluid or old school lighter fluid to aid starting if has been sitting for some time.

Oct 10, 2010 | Chainsaws

1 Answer

Set the carb for a mcculloch 3516 chain saw


Carburetor Adjustment
There are no hard and fast settings.
A good initial starting point for the "H" and "L" needle valves are 1.5 turns CCW from lightly seated.
The "T" adjustment enters here (idle speed) and there is no initial setting without a tachometer, depending on age of your saw there may not be any initial "T" setting.
The "L" needle is primarily idle performance (not speed) and acceleration to full throttle.
The "H" is mostly performance at speed, but all are interconnected.


Start with a fresh mix of fuel. Put ALL of the old mix in any 4 cycle engine and start new. I suggest 50:1 regardless of what your manual says.
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; once marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
Now we adjust for performance. The best performance adjustment procedure I have found follows.
Madsens Shop & Supply, Inc. Carburetor adjustment (All saws homeowner and professional are the same)
http://www.madsens1.com/saw%20carb%20tune.htm Read step 4 (allow it warm before making adjustments).
There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
I am going to inject a little philosophy here. Undetected air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw. A sudden need for an adjustment is often indicative of a larger problem.
If push comes to shove a local saw shop (I prefer Stihl mechanics and do not own a Stihl) should be considered.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Jul 08, 2010 | McCulloch Chainsaws

1 Answer

Hi how to tune homelite 330 chain saw carby, idle


Before adjusting anything, check the fuel filter, air filter, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Tighten all carburetor fasteners. Make sure you have fresh fuel mix in the tank. Does the primer bulb pull fresh fuel into itself when pumped? Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and should allow the engine to start and run. Start the engine and allow it to warm up, then pull the throttle full on. Adjust H needle CW until the engine starts to speed up, but still 4-stroking. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for fairly good idle, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

May 09, 2010 | Homelite ZR10926 16" Chain Saw

1 Answer

Adjust carburetor won't start, or if it does won't idle.


Before adjusting anything, check the condition of factors that pertain to the proper running as: fresh fuel mix, plugged fuel filter, air cleaner, and muffler. Poor fuel lines, and loose carburetor fasteners. Remove the spark plug, and place it on engine metal (wire attached). Pull the engine through smartly--the spark should be blue and snappy. Plug gap should be ~0.020" and the insulator should be light to medium tan in color. Try a new plug if in doubt. When these things appear to be correct, turn both jet screws CW to stops (lightly), and then CCW each back out 1-1/2 turns. It should start and run fairly well at this point. Allow the engine to warm up, pull the throttle full on. The engine should be 4-stroking--turn 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. Allow to idle and adjust L CW until the engine runs fairly smoothly, yet allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain doesn't turn, but the engine doesn't stall out. If you can't get the above to work, you may need to clean and re-kit the carburetor first. Hope this helps!

Apr 24, 2010 | Chainsaws

1 Answer

Hard to start.


My Husky 359 workshop manual says on Appendix A (USA) says "H" 3/4 turn CCW from lightly seated. "L" 1.5 turns CCW from lightly seated.
Page 36 (every other nation on earth) 1 turn CCW from lightly seated for both the "H & L" needles.
There is no recommended initial "T" setting. (from manual) "The idling speed is correctly set when the engine runs smoothly in all positions and there is a clear margin to the speed at which the chain starts to move". I wager your manual would be similar.
These are initial settings and the saw needs to be adjusted for performance. Start with a clean air filter and a fresh fuel mix @ 50:1 per Husky (1 gallon of premium fuel to 2.6 ounces of quality 2-cycle oil).

This explains performance carburetor adjustment better than I can:
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.
I hope you found this post helpful.
Lou

Jan 17, 2010 | Husqvarna Chain Saw 20" Bar

1 Answer

I have a husquarna 357xp I need to know to fuel,air and T adjusments


The Husky workshop manual on Appendix A (USA) says "H" 3/4 turn CCW from lightly seated. "L" 1.5 turns CCW from lightly seated.
Page 36 (every other nation on earth) 1 turn CCW from lightly seated for both the "H & L" needles.
There is no recommended initial "T" setting. (from manual) "The idling speed is correctly set when the engine runs smoothly in all positions and there is a clear margin to the speed at which the chain starts to move".
These are initial settings and the saw needs to be adjusted for performance. Start with a clean air filter and a fresh fuel mix @ 50:1 per Husky (1 gallon of premium fuel to 2.6 ounces of quality 2-cycle oil).

This explains performance carburetor adjustment better than I can:
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.
I hope you found this post helpful.
Lou

Jan 15, 2010 | Husqvarna Chain Saw 20" Bar

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