Question about Craftsman 25cc Gas Line Trimmer

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Trimmer wont stay running after i give it the gas. Drained tank. Changed spark plug. Runs while choke is on and pull up on the throttle. As soon as i let off on the throttle and try to throttle up again it dies. Does the gas need more oil or is it too rich on oil?

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You're on the right track, but it sounds like you have a carburetor issue...might be time for a rebuild kit or just a cleaning. This doesn't always fix every carb however...You can first try cleaning your carb....very sensitive parts inside....use only brake parts cleaner or WD-40 or the like...even most carb sprays are too harsh.There are lots of diagrams and helpful hints on carb web sites...just don't "soak" the carb in cleaner if it's dirty. Older machines accumulate carbon in their muffler and engine and periodically need to be cleaned. It's not that hard to do and it will help you learn how your machine works also.

Posted on Jul 04, 2010

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1 Answer

Weed wackier gas trimmer


didnt specify the make and model so generic answer ---check fuel mixture is correct --check the filter in tank is not plugging up--look for damaged / crack in fuel feed lines-look at spark plug --carb may need cleaning --exhaust port may need cleaning

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Manual for a craftsman weedwacker model 31679108


Trimmer Starts but stall out as soon as throttle is used and choke turns off. if I hold the throttle and pull the choke it runs but will stall as soon as choke is let go.

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1 Answer

Motor has been sitting for a while changed out old gas put new in drained carb bowl put new spark plug wont stay running


Here is the long answer with everything we learned while using a power washer twice a week for years::

It sounds like could be one of the problems listed below or a combination of those things.
1) The exhaust is partially blocked. Check the screen covering exhaust port for carbon and dirt build-up. High-speed exhaust air must pass freely. We finally broke the exhaust screen out with a screwdriver to get our machine going one day.
2) Gas is not flowing freely to carburetor > under gas tank, find the rubber hose connected to carburetor. Pull off rubber hose and make sure gas flows freely. You can use this hose to drain gas tank of old gas ... and then put in fresh gas.
3) Carburetor is partially gummed up and engine cuts off when gas flow slows down. Buy some gum out, and then don't store power washer with gasoline in the tank. Or put additive in gas when storing machine.
4) The choke is letting in too much gas or not enough gas. Try different adjustments. The choke-lever on our power washer got so bad that we could not set throttle at full open or the machine would die. We still use the machine at 2/3 throttle, and then start it each time using WD-40 as described below.
5) Dirty air filter that won't let engine breath enough air to keep up with combustion. Take off air filter and see if problem persists.
6) The spark coil is going bad?? Change spark plug to see if problem persists. Is spark plug wire pushed all the way onto the spark plug?

Now the nitty gritty: we're gonna start that thing right now
7) Take off air filter. Spray WD-40 directly into carburetor. Yes, we use WD-40 every time to start my power washer, and we use the washer twice a week.
Spray in the WD-40, Pull the engine cord. The engine will fire on WD-40. Guaranteed.
Once it starts, keep spraying WD-40 directly into carburetor to keep engine going.
If engine will not fire and keep going on WD-40, then your spark is suspect.
If your engine fires and runs on WD-40 but dies without it, then your gas supply or carburetor are suspect
8) Carburetor problem >>> try Gum out >>> and then take machine to small engine repair shop
9) Spark ... take out spark plug. Put spark wire back on. Hold spark plug by spark wire. Touch metal threads of spark plug to metal opening where plug came out. Metal to metal. Pull back start cord and look for spark between the metal.
If you have no spark, then spark coil is bad >>> take machine to small engine repair shop

Add a comment if you need more help

Nov 21, 2010 | Garden

2 Answers

Weed eater starts but won't stay running


just bought a new Poulan 25cc 2cycle gas power weed eater . I can start it with the choke on but as soon as put on run it dies.

Jul 08, 2010 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Trimmer will only run in choke position


You have a few possibilities. Make sure you have good fresh gas in the tank. You're not getting enough gas, so choking helps get more gas than air, making it run better. Could be the carb diaphram (not very expensive if you replace yourself), when they get old they don't perform like they should. Could be the filter in the gas tank is bad, plugged. Also might be just an easy adjustment on the carb Low, and High speed screws. The choke has three positions, full choke, partial choke, and no choke, which means run position.

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1 Answer

GAS TRIMMER WON'T START - BUT ALMOST STARTS WHEN I POUR GAS IN THE SPARK PLUG POCKET, THE GAS THERE DRIES/DISAPPEARS FAST. MUST BE A GAS LINE SITUATION? WHAT SHOULD I DO?


The gas is going into the the crankcase. When the piston goes down it opens the ports and allows the gas to go down untill it could fill the crankcase. Start by blowing compressed air into the spark plug hole and allowing the piston to go to it's lowest position. This will usually remove any liquid gas from the crankcase. Next get yourself a small spray bottle and fill it with the same gas mixture your trimmer uses. Now you can spray a small amount into the spark plug port, replace the spark plug, full choke and pull till it pops. set to half choke and pull. I have also sprayed into the carb but you must open the throttle to allow the gas to enter the combustion chamber. Spray,close throttle,pull choke and pull. You may need to do this a few times for it to start. After it starts let it run at half choke for awhile until it warms a bit then open choke and go to full throttle. If this dosen't work it's possible to have other problems.

Apr 21, 2010 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Trimmer wont stay running


the top line from the gas tank goes to the front nipple on the carb, the lower line from the gas tank goes to the back nipple on the carb

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1 Answer

Only runs on full throttle


Are you saying full throttle, or full choke? if full throttle, you should be able to set the idle up. the idle screw will be the one when you give it gas, it will be the screw on you'r throttle linkage. If full choke, maybe the spark arrestor is plugged. You can remove it by removing the muffler.It would be between the muffler and cylinder head. You don't need this to run.I hope any thing I posted will help.

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