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Poulan chain saw carb tune

I rebuilt the walbro carb on my chain saw. It starts and runs fine but tends to die at high rpm under load. You have to feather it to keep it running. Once it dies it will not start until cool. I tried adjusting the high mix screw. Does not seem to make much difference. Start at 1 1/8 turn all the way to 3 1/2 turns. My weed eater does the exact same thing.

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  • donaldly Jul 10, 2008

    Walboro carb high RPM problems

  • Anonymous Sep 25, 2008

    I have a Poulan Predator and it does the same thing. I wanted to try to adjust the fuel mixture but cannot find a tool to adjust. The adjusting screws are rounded at the end and will not take a screwdriver or sockets. I have changed fuel filter, cleaned air filter, cleaned muffler-spark arrestor, checked spark plug, and checked fuel line for leaks. I have not solved the problem. This is why I think it is the fuel mixture. My saw starts up okay, but I cannot let off of the throttle or it will die. Then I cannot start it until it cools off. Does anybody have any suggestions?

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Starts with the choke then shuts down when you shut off the choke. what is the settings for the carb

Posted on Oct 14, 2009

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Under heavy load it will suck a lot more fuel. The fuel line could be pinched but not completely cut off the fuel flow. Under load it may not be able to deliver enough fuel. Check the point where the fuel line passes through the fuel tank. That could be a possible pinch point or it could have a restriction at that point or somewhere else in the fuel line.

Posted on May 01, 2013

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This engine came with 2 different carbs. Walbro and Nikki. The Nikki carb has a very fussy float plate! I fight them often! Usually there is a problem with the odd gasket that lifts the flat plastic plate and causes a very low fuel float level in the carb so the only way it stay running is to have the choke on. The main fuel jet on both carbs is up inside the threaded area of the bowl nut. When the main fuel jet clogs...and it only takes a speck of something you also get the symptom of having to use the choke to keep it running.

http://www.partstree.com/parts/dispdiagimg.php?src=r&ilFN=D%3A%5CEMPARTweb_52%5CCatalog+Data%5CEMP_IMG%5CBRG%5Cimages%5C6359%5C0004.TIF&ilSC=10&ilIV=0&ilBR=0&ilIF=G&ilRE=8&ilSH=0&ilEG=0&ilRO=0&ilSC=24

Main fuel jet is item 117 Nikki or Screwed into item 142 Walbro of the of the above link depending on which carb you have.
The plate I am talking about on the Nikki carb is item 135. The fussy gasket is 137A.

THE threaded area is where all the main fuel supply is drawn from the float bowl. All that must be free of obstructions. Until this is clear and orifices / jets are not obstructed; your going to be running on choke....

Thanks for choosing FixYa,
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Carl

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