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Model 3400, runs on idle but not at full speed,

Model 3400, runs on idle but not at full speed, cleaned everything, adjusted mixture screws per manual. can fool it if choke is pulled out slightly but runs like not getting gas at high speed?

It seems like high speed channel in carb is plugged but I can not find anything. When it comes off idle when pulling the throttle it just dies.

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I think like you it is running lean. Normally I would provide a link to the IPL (exploded parts list) for your saw but Poulan just locked the site for non-dealers. Please register your displeasure here http://www.poulanpro.com/node4020.aspx. IMO as an owner, you should have free access to these.

Sounds like time for carburator kit, HTH
Lou

Posted on Sep 26, 2009

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Start with 1 full turn out from the closed position on both the idle and high speed mixture screws. After the engine has warmed up, hold the throttle wide open and adjust the high speed mixture screw until the engine runs at the highest RPM then turn the screw counter-clockwise about 1/8 turn.
Next, turn the low speed mixture screw in whichever position gives the best idle.
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In California the new blowers have sealed mixture adjustments and you need the have your carb. mixture adjusted be a qualified shop. If your carb. HAS mixture adj., turn the high speed mixture so it runs best at high speed, then turn another 1/8 turn counter clockwise to be a little rich. Then at idle adj. the other screw till it idles best.

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Choke problem


That's an indication that the idle mixture is too lean, as the choke richens up the mixture, allowing it to run.

Your carb should be similar to this:

http://www5.picturepush.com/photo/a/3728808/img/3728808.jpg

The AIR SCREW adjusts the mixture (rich/lean), and the IDLE SCREW adjusts the idle SPEED.

Try screwing in the AIR SCREW 1/2 a turn and see if that helps.
If not, try another 1/2 turn.

Still no idle?

Turn the screw back where it was (1 full turn) and then screw it OUT 1/2 turn, then if not, another 1/2 turn.

Once you have the mixture correct, the idle speed can be set with the IDLE SCREW.

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If the two screws are side by side, one is the high speed mixture screw and the other is the low speed mixture screw. To set the high and low adjustment screws, tighten the screws in until they stop, don't force the screw after it stops. Back each screw out 1 1/2 turns. The engine will start and run here if everything else is ok. Fine tune each adjustment screw by closing the screw off (CW) until the engine runs rough. Back the screw out (CCW) until the engine smooths out. Run the engine at full speed and adjust the high screw. Let off the trigger and adjust the low screw. Once the mixture screws are adjusted, you can turn the idle screw to adjust the idle speed. It can take some time getting it all adjusted.

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I have a 1995 homelite plt-3400 gas trimmer. It starts ok. It runs fine at full throttle, but will not idle. I have replaced the primer bulb because it had a crack and it has a new spark plug. I have also...


You may be able to adjust the carburetor as I describe below but if it doesn't work then I would recommend you clean the carburetor and install a carburetor kit. When you have it back together then you will need to able to adjust the two mixture adjustment screws. When you have it started you goal is to adjust the idle screw so it not only idles but when you pull on the speed control it does not falter you try to accelerate it. The other screw affects the mixture at higher speed. When you can accelerate it from idle to full speed and back again repeatedly without faltering etc. then it is fairly good. If you turn both of these screws counter clockwise a little more it should reduce the risk that you may be too lean. It still needs to run well. I hope this helps and if you have any other questions feel free to contact me.

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