poulan 2550


Old 01-02-02, 04:12 AM
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poulan 2550

I was given a Puolan 2550 chain saw that is about 3 years old. It will run fine when at full throttle but does not idle. I changed the spark plug , cleaned the air filter , but to no avail. Any suggestions on this before it goes to the shop.
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Old 01-02-02, 02:24 PM
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Cool Carburetor Fuel Restriction

Hello and Welcome P.Roper to our Do-It-Yourself Web Site and my Small Engine forum.

Since the engine runs well at full throttle but not at idle, it would most likely indicate the carbs idle speed fuel ports are restricted or clogged up.

Another possibility may be the low speed fuel adjustment screw may need to be opened up slightly. The screw marked with an "L" is the low speed fuel adjustment screw. It should be opened about 3/4 to 1 turn outwards but this setting is at sea level and your may vary.

If adjustments to the carb settings do not correct the problem, the carb will need to be removed, disassembled, cleaned out, reassembled and reinstalled.

Carb rebuilding tips:
Removing the carb shouldn't be much of a problem. That's once you gain access to it. On some brands and models, this isn't always so easy to accomplish.

However, once you do gain access to the carburetor, be sure you make note of exactly how the throttle linkage is connected to it and the throttle lever, so you can reinstall it exactly as it currently is. Use care handling any springs attached to the carburetors linkage so as not to overly bend or distort them.

Prior to any disassembly of the carburetor write down exactly how many turns out each fuel adjustment screw is currently set at. There will be two screws. A high "H" speed screw and a low "L" speed screw.

To determine how many turns each screw is turned outwards, count the number of turns it takes to scerw it in until it is lightly seated. This will then be the number of turns outwards it takes to set the screw back to it's orginal postion when the rebuild is completed.

I would highly recommend you disassemble the carburetor on a well cleaned and completely cleared off workbench top with plenty of lighting. Diaphragm carburetors are often very tiny therefore they have tiny internal parts, which can get lost easily.

Carefully remove each piece of the carburetor and make special note of exactly how it came off and in which order it came off. Also note which side or which way each part is facing or installed.

Mufflers on two cycle engines may become restricted or clogged up with carbon deposits. About the only concern regarding removing the muffler is breaking off the head of a bolt or damaging the heads of a screw. Be sure to reinstall the muffler and spark arrester as currently found.

I suggest to only use only aerosol canned automotive carb spray cleaner to clean the inside body and clear the fuel ports and jets. Automotive parts dip cleaners are much too caustic for tiny carb parts.

The plastic tube end that comes with the canned cleaner is an excellent means to flush out gums and sludges from the jets, ports, channels and under welch plugs without removing them.

Use EXTREME CAUTION cleaning any parts with an automotive aerosol parts cleaner product. Aersol liquid parts cleaners are EXTREMELY FLAMMABLE!!! The manufacturers CAUTIONS should be strictly adhered to.

Read the product manufacturers online web site for product information, problem solving methods, disassembly, reassembly methods, repair proceedures and instructions, pictorials and schematics, which may be available online.

An excellent source for orginal replacement parts is your local retail lawn mower and or small engine repair shops. Dealers and repair shops are listed in the phone book.

Retail parts dealers can also help determine what the possible problem may be. Bring the make, model and serial numbers with you if you stop in at the store.

Check the archives, within this forum, for other postings and replies on this topic.

Regards and Good Luck, Small Engine Forum Moderator
Tom_Bart.....Company Enterprises.....TCB4U2B2B
"Accurate Power Equipment Company"
Small Engine Diagnostic Service and Repair Technician.
Personal Quote:
"If it ain't already broke, don't fix, tinker or $#@&$#@! with it until it is broken!"

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