Question about Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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Base adjust. on carb high and low needles on carb polen 42 18" thanks

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The standard setting on needles is to screw them in all the way and then back them out 1 and a half turns.

You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. turn the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn. You may need to readjust the idle speed so the chain doesn't turn during idle. Do the same for the high adjustment screw.

Posted on Oct 01, 2009


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How do i tell the differance betwen the high and low speed needles for a c1q zama carberator

LOW Speed is always nearest the engine...

High speed is always nearest the air filter...


now there are some that only have one adjustment needle and it\'s an air bleed only (worthless crap)

or in Echo\'s case it\'s a single adjustment carb (still worthless)

Aug 22, 2014 | Garden

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Need to find proper carb needle valve settings for case 444 Kohler

This is the Kohler K321 engine.

You can find the service manual here: (14.16 mb)

The inital carb adjustment setting procedures start on page 29
Kohler carb low idle 2 1/2 turns from closed Walbro carb 1 1/2 turn from closed
Kohler carb high idle 3 1/4 turns from closed Walbro carb NA

Thanks for choosing FixYa,

Jul 08, 2011 | Garden

2 Answers

What are the settings and which jet is high speed adjustment for Homelite Inc. vac attack blower EM08652-01

Hi Roseann, newer 2 stroke engines for the past 6 or 7 years have changed to newer carburetors, and some of them don't have any adjustment needles at all, or just 1 adjustment needle adjust. Without knowing how old your Homelite is or what type of carb you have, I will assume you have adjustments. If you look carefully at your carb, next to each needle you will find the letters F or H, F is the fast speed adjust needle and L is the low one. In general the L or low speed needle is the one closest to the motor. To adjust them you turn both the H and L needles in (clockwise) until lightly seated (so no damage is done to the needle or the seat), now you turn them both out (counterclockwise) 1 turn. You should be able to start your vac with these settings. Only minor adjustments should be required if any at all. To adjust the low one with your engine running at idle, turn in just a little and notice if any difference, if not turn a little bit more until it starts to run rough, now bring back to the position you started with and now turn it out (counterclockwise) in small turns at a time until it starts to run rough. When you do this remember the position of the needle (how far in and how far out) and adjust to the needle to the middle of those 2 positions. Do the same with the H or high needle. At the top of the carb where the throttle cable hooks to the carb you will find a screw that is to adjust the idle speed by adjusting the throttle position. You can adjust that screw at any time to get the idle speed you want.
I hope this is a bit helpful to you. All the best and good luck. Any questions welcome.

Feb 23, 2011 | Garden

1 Answer

I have a Poulan Pro BVM200 blower that will not run. I've cleaned the carb, changed the plug, and added new gas. It will fire up with starting fluid and die within two seconds. I tightened the head and...

turn the needles all the way down to where they just stop dont tighten to tight just when they stop then back them out 1 full turn and see it should start then adjust from there if no start or runs wildly then a carb kit is needed

Feb 13, 2011 | Poulan Garden

1 Answer

I have a craftsman 917298231 tiller, that has a 3hp briggs and stratton motor. The problems seem to be that it is not getting any fuel. The motor will run for a short time when gasoline is poured in the...

Hi, I will try to help you solve this problem by checking the easiest things first. Do you have a shutoff valve under the tank and is it open? Did you check for dirt inside the tank that might be blocking gas flow, and the fuel line also? Have you looked for loose bolts and gaskets at carb that could let air in and prevent suction bringing gas in combustion chamber? When was it last used and how old is the gas in the tank or has everything dried out? As gas evaporates it leaves a sticky sludge that can plug up small ports or like the inlet needle not letting fuel in.
I really think the problem is with the carburetor either adjustment or that it needs cleaning. Look at the carb and maybe even make a small diagram to remember where everything goes specially the governor rod and spring.
Shut off the fuel valve if you have one. If you don't go ahead and remove the carb from engine. Disconnect the governor rod and spring, the ends are just bent in a special way so you can slide them out of the holes by moving the carb in different positions. Remember which holes they come from, (very important) and try not to bend anything. A little patience is helpful. Now remove the fuel line, lift up the carb as you do and get a golf tee or a pencil to plug the fuel line so gas does not come out.
Remove the special bolt at bottom of carb, it has small holes drilled into it that have to be cleaned very well as they are part of the high speed mixture circuit. Look for a very, very small hole drilled on the side of this bolt towards the thread end of it. There will be a slot machined in the threads and this is where this hole is. Make sure it is clean, (do not use any wires to clean these passages as they might be damaged) The high speed mixture adjustment needle is usually part of this bolt machined into it but not always. If it is not then the high speed port is fixed and has no adjustment.
Now you will find the float, gently move it up and down to see if the inlet needle might be stuck which could be the main problem, not letting gas in. The float is held on with just a pin that you pull out to remove the float and inlet needle. (before removing the pin look for a little wire clip that holds the inlet needle to the float. Remember exactly how it is positioned) Now remove the screw situated on the side of carb, it has a spring on it. This is the low speed idle mixture adjust needle. (BEFORE removing either the high or low adjust needle, turn clockwise until GENTLY seated and remember the number of turns for each one)
Now clean all parts with paint thinners or carb cleaner. (NOT rubber parts) Blow low pressure air into all parts. On the outside of the carb look for a small vent hole, either on the low adjust screw side or the other side, it is again very small and has to be clear. (between me and you I sometimes cheat and use, being very careful a small brass wire or stiff plastic to help clean ports and passages when badly plugged. If you decide to go that way, you do on your own.) Before reassembly check needles for any damage like having been seated too hard and they are marked. If any damage and gaskets don't look too good get a carb kit, they are not that expensive.
Now carefully reassemble. A start for the high and low speed mixture adjust needles. The low screw on until lightly seated and back out 1 turn. The high speed mixture needle on the bottom of carb on bowl bolt, turn in until lightly seated and turn back out 11/2 turns. This is what the manufacturers suggest as a start that should get the engine going to make final adjustments, They are usually very close to being right. There is a screw on top of the carb, this is to adjust the idle speed so that when you release the throttle it will not stop on you. Adjust the way you like your idle speed to be at. I hope this gets you going. Final adjust of carb needle screws is not too hard if you take your time.
Do not go too lean, which means not enough gas in the fuel air mixture as it could make your engine run too hot. When you turn a needle screw in (clockwise) there is less fuel and when you turn out there is more gas in the mix of air and fuel. When you make adjustments go 1/8 turn at a time. Another point is when you push on the throttle to get more speed and it sort of misses or hesitates. turn low mixture screw out (counterclockwise) to get more gas in mix until it accelerates without missing.
Reinstall the carb on the engine, (you might need a new gasket, I suggest you get a new one) Be specially careful with the 2 governor linkages on the carb. If you got a carb kit there should be one included.
I hope I have given you enough info to do this. If you do this yourself I am assuming that you have a bit of mechanical experience as this is not that easy to do. I certainly hope this is helpful so best regards and good luck. I will gladly answer any more questions.

Feb 01, 2011 | Craftsman Garden

1 Answer

My snow thrower starts and runs but while it is idling it revs high then low then high again then low and then stalls out.What could be causing this?

Does it run good on the higher speeds? The first thing to try is to adjust the low speed needle. Try turning it counterclockwise in small increments and see what happens, if that does not work bring it back to its original position. Now try turning it clockwise to see what happens. bring back to original position. You might try the high speed needle just a bit each way. Sometimes that helps out. Here is a tip:(always remember your starting position wnen you adjust anything, that way you don't get completely lost. I learned the hard way)Your carburator or governor or both need adjusting. It also could be the carb that needs an overhaul, (cleaning). Have you looked to see if you have an air leak somewhere, like the gaskets, loose bolts on carb, or also the bolts attaching the carb to engine. I hope that helps you a little bit. Maybe somebody might have a different idea to help. Best regards and good luck.

Dec 21, 2010 | Garden

1 Answer

The chain saw runs okay until i start to cut wood on higher revs then it cuts ouy

Does it run O.K. with high revs. with no load, but dies when you start to cut (load) ? If that is the case your carb. needs to be adjusted and that is difficult to put into words. Without knowing what make of carb you have because they can change from year to year, and also depends on the model. Without knowing make of carb I suggest you try to turn the L (low) and H (high) needles in (clockwise) until they are lightly seated so you don't damage the needle or seat. Now turn them both out (counterclockwise) one turn as a start. Start your saw to let it warm up now rev it up it should not hesitate or run rough while reving up. If it does turn low needle out 1/4 turn or more if needed until it does not hesitate. (turning any needle out will let in more gas turning in less gas) If you get this far good idling and reving up, now adjust high needle the same way. With high needle you can also try turning it in. keep on adjusting needles in or out in small increments until it runs right. If you cannot get it running right after all this, you probably need a carb overhaul, just a cleaning or carb kit if diaphrams are stiff or damaged. I hope this helps you. Please forgive grammar errors. Let me know how you made out.

Dec 01, 2010 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

High & low carb needle settings

I would start with both the "H" and "L" needle valves at 1.5 turns CCW from lightly seated then adjust for performance as follows:
Carburetor Adjustment by
  • 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.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH

Mar 16, 2010 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

How to adjust the low and high settings on the carb

With all the new EPA guidlines on emissions there are many new type of carbs.The older type was easy, If its a walbro or zama brand and it has 2 adjustment screws as well as an Idle speed, preset the low and high at 1.25 turns out from set, start the saw, run it to full throttle,adjust the high speed needle counter clockwise untill you hear the engine start to flutter. You want to year the flutter about once every 4 seconds.then let it idle,adjust the low speen till it runs smooth then make it 1/8 turn richer. Many of the new carbs require special tools to adjust, not brain surgery, just to keep the air cleaner..

Oct 27, 2009 | Poulan Garden

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