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Saw starts, but will not accept load. It will run at medium speed on start up, after taking the choke off, but will not accelerate. It starts to do so, but then sputters and stalls. Start up is normal - Pull out choke, a couple of pulls till it sputters, push choke in and pull - starts right up. I cleaned the air filter, muffler spark arrestor. Spark plug looks good.

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  • dontbother10
    dontbother10 May 11, 2010

    Please read this... Dolfoff carburetor threadhttp://www.fixya.com/support/t3026775-sa...

  • dontbother10
    dontbother10 May 11, 2010

    Excellant start procedure. It isn't spark. I think you have a leaking fuel line, dirty fuel filter, or most likely a little dirt in the carburetor. It is beyond my level of expertise to tell how to clean the carb, soneone else will be along soon.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 226 Answers

SOURCE: McCulloch 3200 takes many pulls to start, runs good when does.

I don't think I can help, but normal starting procedure for me is to put choke on, pull on recoil until it kicks over once. shut off choke and restart. Sounds like you have fixed almost everything & adjusted mag right. Rick

Posted on Apr 17, 2009

dontbother10
  • 2220 Answers

SOURCE: My echo cs440 all of a sudden stopped running at

That is where I would go. Maybe carb clean or kit if it is a sudden change.
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.

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
Lou

Posted on Mar 01, 2010

mark24354
  • 776 Answers

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

The best thing you can do to these engines it take them completely apart - take piston out and everything. Believe it or not, my 12-year-old son was able to do it - very few parts in these little 2-stroke engines. He polished the carbon off of the piston with a drummel tool and cleaned everything with carb-cleaner. Put it back together and it ran like a champ. Still does. It was a great learning experience for him too. The worst that can happen is you have a bunch of parts that you will throw away.

Posted on Mar 19, 2010

  • 4088 Answers

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Posted on May 14, 2010

Biggdex35
  • 333 Answers

SOURCE: I have a McCulloch MS1636NAV chain saw. The engine

Its either sucking air in throgh a loose connection in the fuel line or the carb is stopped up. Take it apart very easy so you don't rip any gaskets, and clean evertthing with a can of compressed air blow all the tubes out real good. You may have to get a carb kit it that does not work.

But that sounds like what it is, running out of gas when you let more air to it.

Posted on Oct 05, 2010

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1 Answer

Why does it run only with the throttle in choke position?


Hi John:
Sounds like it's too lean.
Try backing out the high speed screw 1/2 turn at a time until you don't need the choke. Then tune the high speed with saw running at full throttle. Screw in (lean) until RPM starts to drop, then back out 1/3 to 1/2 turn. Then set low speed at idle so engine is smooth but chain does not turn.

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check with a husq.dealer,they had some crummy carbs that may need replaced not rebuilt

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The initial hi and low jet settings are in the owner's manual or sometimes stamped on the side cover next to the carburetor. If you do not have a manual go to lawnandgarden.manualsonline.com to get one.

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My Homelite ZR10926 16-Inch 33cc Ranger it is starting, idling, it dies when I accelerate it. I assume is the carburetor, maybe ? thank you.


It probably is not getting enough fuel. Check the filter in the tank. If it has been sitting with stale gass this filter plugs up.
Try running the engine with some choke. If this helps, try adjusting the carburetor high speed screw.

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1 Answer

Poulan 45cc chainsaw will start running with starting with choke, but will not stay running.


Sounds like the low speed fuel adjustment is out of whack....you can reset it by turning it in all the way clockwise...then as a starting point, turn it out 1 and 1/2 times, start the engine and slowly adjust the screw until the engine starts to choke out..when this occurs, turn it back in until it starts to choke again...then you need to set it somewhere in between to find the "happy medium"....thew high speed screw is adjusted after you get the engine idling properly...if you haven't messed with this then I wouldn't worry about it..unless you have poor high speed operation, then you will need to set the high speed screw...the object here is to obtain the best low to high speed throttle...if , when you throttle up the saw, the engine bogs or goes to high speed slowly , here is where you adjust to get the best throttle response...use small increments until you achieve the desired response

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1 Answer

Fuel mix and slow/fast running jet ajustment Dolmar sach 119. starts easy wont pull under load.


Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...

http://www.youtube.com/watch?v=3Lw0pJcEPYo&feature=player_embedded

Dec 08, 2010 | Garden

2 Answers

Mighty lite 26ss starts fine, but needs half choke for a long time. Runs for 10-15 mins. and seems to starve out. Acts like an air leak at carb or downstream. Any ideas?


I fixed one of these with the same problem yesterday. Theonly thing I've found wrong with this little saw is the carbs are terriblyadjusted from the factory and the mixture screws have a 'proprietary' head.they're a flat-topped cylinder with a notch in the side.

fortunately, there is a way to turn them. The insulation on a blue solderlesselectrical terminal will grip the outside of the mixture screws enough to movethem. you use the big end of the insulation you stick the wire into. doesn'tmatter what kind of terminal it is. splices work the best because theinsulation is long enough that you can grab on to it, but I just pulled theinsulation off a spade terminal and used pliers to turn it, as I didn't haveany splices.

I pulled both mixture screws out and cut a slot across the top with a smallfile so I can turn them with a flat head screwdriver. if you do this, only pullout one at a time, they need to go back in the respective seat they came fromor they won't seat properly.

I also took a file and cut an access notch in the air cleaner housing so Icould adjust the high mix while the trimmer was running. takes 10 seconds witha coarse round file, but a chainsaw file takes forever.

To set your mixtures, screw both mixture screws all the way in until theylightly seat. DON'T tighten them way down, just lightly seated.
now, look at where the notch is pointed and turn them out 1 1/4 turns. turningthem out (counterclockwise) makes the mixture richer. turning them in(clockwise) makes the mixture leaner.

now, screw the idle in a full turn so it idles very high (you'll turn this backout later, but this takes some of the frustration out of tuning the carb). You maywant to take the string head off, as it will 'run' at idle now.prime the trimmer (10 pushes if you haven't tried to startit earlier, 2-3 if you did. you can't over-prime, though, you're just removingair bubbles from the fuel pump)

put it on full choke, grab the throttle with your left hand and pull the recoiluntil it tries to start. if this takes 10+ pulls, turn the low speed jetout(richer, counterclockwise) 1/16 to 1/8 turn. you want to work in smallincrements, or you'll waste a bunch of time overshooting where you want to be.

once you get it to bump over full choke, back the choke off a bit. if you'requick you can usually do this while thetrimmer is trying to run fully choked. most likely you're still going to belean on the high mixture, so having the throttle pulled may kill the saw. if itseems like it's dying when the throttle is pulled, but not at idle, then you needto turn out the high speed mixture screw.Concentrate on getting the low speed jet set so it will idlewith the choke off and the throttle off first. Once you get it so it will idle unattended, you can startbacking the idle speed down. From there, you can adjust the low speed jet whilethe saw is idling. Start by turning it leaner in small 1/16 turn incrementsuntil the speed picks up. If this kills the saw before the idle picks up, youhad it a bit too lean to start. if you get the idle to pick up, richen up themixture 1/16 turn. You want to be just richer than where the speed picks up. Ifthe saw died before it picked up, richen it up 1/2 a turn and start it again. Leanit out as before until the speed picks up, then richen it up a bit. This may sound time consuming, but you can stick ascrewdriver on the idle screw and gently turn it in continuously, so itactually goes pretty quickly once you get the saw to idle.Now that you have it idling nicely, you can adjust the highspeed jet. Start by 'blipping' the throttle. If the trimmer bogs down, richenthe high mixture. Now, if you're WAY rich, it will behave similarly, but with thistrimmer, that's pretty unlikely if you're starting at 1 1/4 turns. One way youcan tell if you're way lean or way rich is with the choke. If it will run fullthrottle with the choke part way on or if it picks up faster with the choke partway on, you know it's too lean. The choke richens the mixture up to compensatefor the gas condensating in the throttle bore when the saw is cold. If thechoke kills it, you're too rich.if it will run, then you can adjust the high speed similarlyto the idle. A leaner mixture will have more power and spin a higher RPM to apoint, but it will also run MUCH hotter and an excessively lean mixture willseize the piston. So, you're going to want to err on the rich side. You'lldefinitely be able to hear the rpm change, a way rich mixture will be almost 1/2the speed of the proper mixture, and a too lean mixture will sound like thetrimmer is going to fly apart at the seams. Once you get the high mixture to the point that you can grabthe throttle and the saw will pick up to max speed in less than a second, thenyou're ready to cut something. You may need to adjust the mixture leaner for abit more power if it bogs down in normal grass trimming, or if it is running througheverything including big weeds without changing speed, you should probablyrichen it up. This is NOT a big trimmer, it SHOULD bog down a bit if you loadit up.A final note about this trimmer, I never could get it to acceleratesmoothly from idle to high speed. It lags for about 1/4 second just above idlethen it picks up as it should. It runs fine once it gets past that hesitation,you can vary the throttle to be delicate around things, ect, but if you let itidle, it does hesitate when you pull the throttle again.I was pretty surprised how well it ran once I tuned itthough, this one is my boss's and he's got a 3-blade cutting head on it that'sa lot heavier than the string head and it will spin it just fine. It will cutdown saplings to maybe 5/8".Good luck!

Jun 26, 2009 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Will not run unless half choked.Will not run above idle speed.


It is a carburetor problem. The easiest thing to do is replace the carb. If you can do that yourself, post the model # of the blower and I'll tell you the part # of the carb. Otherwise, you will have to take it to a shop

May 31, 2009 | Poulan Garden

2 Answers

Poulan chain saw mod. SM4018 Hard to start & won't accelerate


Your carburetor needs cleaned. It may also need a carburetor kit, depending on how old or how long it has been since service. While you have it apart, you may as well clean or replace the air filter and check fuel lines for cracks or brittleness. If you need tips on how to clean carb. or changing fuel lines, just let me know.

Jim

May 30, 2009 | Poulan Garden

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