Question about Poulan Pro Chain Saw 46cc 20"

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FUEL MIXTURE SCREWS BEEN ADJUSTED IMPROPERLY. WHAT IS PROPER HIGH -LOW CARB SETTINGS FOR 40CC POULAN CHAIN SAW

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Make sure the air cleaner is not plugged. Turn both jet screws CW to stops (lightly), then back each out 1-1/2 turns CCW. This is a basic setting and should allow the engine to start and run. When the engine is warmed up, pull the throttle full on and adjust H jet needle CW until the engine starts to speed up, but still 4-stroking. Correct adjustment is when the engine 4-strokes running free, but immediately 2-strokes when cutting. Release the throttle and allow to idle. Turn the L jet needle CW until the engine idles fairly well, but the engine should 'follow the throttle'. It will tend to 'gasp' when pulling the throttle if you have gone too far. Idle speed screw should be set so that the chain doesn't try to turn, but the engine continues to idle. Hope this helps!

Posted on Jan 04, 2011

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1 Answer

Settings for mixture screws


Most Chain Saw Engines Have Three Carburetor Adjusting Screws:
1. Idle Speed/Throttle Stop - This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. If this adjustment is set too low, the engine will die when the throttle trigger is released. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
2. Low Speed Fuel Adjustment (marked L on carb, this is the low speed jet)- This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at idle speed. An adjustment that is set too rich will cause the engine to load up and die at idle speed. A mixture that is too lean will starve the engine and cause it to race or surge. An extremely lean adjustment will cause the engine to die, too.
3. High Speed Fuel Adjustment (marked H on carb, this is the high speed jet) - This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power. Throttle response may also be sluggish and the engine would smoke and perform poorly. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. It will also lack power in the cut and tend to run very hot.
The preceding information briefly explains rich and lean running conditions. It also identifies the three adjustment screws and their function. It should be noted that some chain saws lack the high speed adjustment needle. These saws have what is called a "fixed jet" which is set from the factory. "Fixed jet" carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Unfortunately, they also often prohibit the saw from achieving maximum performance.

Apr 11, 2016 | Garden

1 Answer

Fuel mixture adjustment


you mean for the carb ??? you need a special tool to do this... if you have the tool then start with both mixture screws 1 1/4 turns out, adjust from there. If you don't have the tool, please take it somewhere... a decent small engine shop should have a minimum charge to do this. they should also tell you at that time if you have other issues... but before you try all of this. how about just getting some fresh "non-ethanol" fuel and a high quality 2 cycle mix like Red Armor... 50:1 ratio... dump the old, add the new, pump the primer until the old is out and go from there... #my2cents

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1 Answer

Installed new carb-saw will idle fine,but will not rev.Idle scew has no effect on r.p.m.As soon as you hit the throttle,saw dies.Almost act's like the chain brake is on but it is dissengaged.Both...


There are a few things to check, if the muffler has a spark arrester gauze in the out let this may well be blocked, remove the muffler and the gauze, does the engine now rev? if yes either the park arrester is blocked or the muffler itself is blocked, if this does not cure it, check the flow of fuel from the tank to the new carb, replace the filter in the fuel tank and try again, if this does not help try running the saw with the air filter removed, if it revs normally the filter is blocked.

Aug 28, 2011 | Poulan Pro PP4620AVX 46cc Gas Chainsaw...

1 Answer

Poulan " Wild Thing


It is running lean, they always need to run a little on the rich side free running, once the engine is loaded it will then need the excess fuel, it runs ok without the bar and chain because there is no load, start by replacing the fuel filter in the fuel tank, check the fuel hose up to the carb for signs of fuel leakage, replace if reqired, if the carb has standard adjuster screws, increase the H screw by 1/4 turn out ( anto clockwise ) this will richen the mixture.

Aug 22, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

2 Answers

42cc 18 inch craftsman chainsaw model 358-351910-18. Saw runs great at idle or while not cutting wood, when starting to cut wood just after the entire bar gets into the wood engine bogs down and chain...


Generally this is a fuel / air ratio problem. Usually it can be solved by a carb adjustment. On the carb there are usually two screws, one marked low or L , the other marked high or H. Low is your adjustment for idle mixture, high is for mixture at full throttle. The saw should Always be adjusted to run well during the cut. Make adjustments a little at a time, then try The saw. Continue small adjustments untill the saw is performing well at full throttle while Cutting.

Aug 09, 2011 | Poulan Pro Chain Saw 46cc 20"

1 Answer

I would like to get the proper settings for my low and high fuel jet screws on my 371k chain saw motor


theres no exact setting to use. and they are high and low air screws. the small flat head screw by the throttle lever on the carb is for fuel. but the best way to figure it out is to turn both air screws all the way in and the back out 2 and 1/2 turns. that a good starting point. from there adjust the low with the saw ideling till it sound good and the adjust the high with the throttle wide open till it sounds good.

Jul 08, 2011 | Husqvarna SM 125 Motorcycles

1 Answer

Poulan PP4218AV 18" Chain Saw


Sounds loike its running lean, start by replacing the fuel filter on the end of the pipe in the fuel tank, if this does not help you need to richen up the mixture screws, unfortunayly you need a special toll to adjust the screws ( they have a spline, not a screwdriver slot ) the tool is part no. 530035560, once you have the tool unscrew the carb screws 1/2 turn on each and try again.

Feb 13, 2011 | Poulan PP4218AV 18" Chain Saw

1 Answer

Carb. settings for poulan 3400


set both of them at 1 1/2 turns out and then fine tune it from there if necessary. This setting is usually right on. Hope this helps you, Jeepfxr

Jan 27, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

2375 ''wild thing'' poulan saw hard starting after carb rebuild


Through trial and error on fairly new Poulin Pro, found that the usual 3-half turns for both high and low was too much (flooded) (Used to be good starting point on weed eaters years ago. So, turned both all the way in, and only backed out 1-full turn. (2-halves) Saw fired up perfectly, and ran wide open just fine. Try that.

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