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String Trimmer Runs Poorly

The string trimmer small engine often has a separate model number. Use the small engine model number for a complete list of symptoms and parts. Watch our model # lookup video for help finding the model number.

The 5 most common part(s) or condition(s) which contribute to the symptom String trimmer runs poorly are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Carburetor

If the string trimmer runs poorly, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the string trimmer engine for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn making the string trimmer engine run poorly. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.

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Carburetor Kit

If the string trimmer runs poorly, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the string trimmer for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor assembly and it can be difficult to burn making the string trimmer engine run roughly. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor assembly with carburetor assembly cleaner. If that isn't effective, rebuild the carburetor with this carburetor kit.

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Air Filter

If the string trimmer runs poorly the air filter might be clogged. Remove the air filter and replace with the correct filter.

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Fuel Filter

If the string trimmer runs poorly the fuel filter might be clogged. If old fuel was left in the string trimmer for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the fuel filter and it can be difficult to burn making the engine run roughly The only solution is to drain the old fuel from the fuel tank and replace the fuel filter.

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Spark Plug

If the string trimmer runs poorly the spark plug might be defective. All small engines have an ignition coil. The coil is the device that provides spark for the spark plug(s). If the coil is bad power won't get to the spark plug(s). The coil is essentially a small, induction generator. It is mounted next to the flywheel. The flywheel has one or more strong, embedded magnets. As the flywheel spins, the magnet(s) zip past the induction coil, this action of a magnet passing past a coil induces a voltage. Depending on the design of the coil and the strength of the magnets, a stronger or weaker spark can be created and delivered to the spark plug(s). Each time the flywheel spins around a spark is generated. The best way to test a spark plug is to use a spark plug tester. The spark plug should have a strong, visible spark between the electrodes when the engine is cranking. If it doesn't, replace it.

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