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Weedeater String Trimmer Won't Start

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.

ULTRATRIM

The 7 most common part(s) or condition(s) which cause the symptom String trimmer won't start are listed below starting with the most likely. Check or test each item and watch any available videos.

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Spark Plug - Part # 1863244 Mfg Part # 863

Spark Plug

RepairClinic Item # 1863244 Aftermarket (Non-OEM) part

If the string trimmer won't start 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.

$3.50

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Carburetor - Part # 1995778 Mfg Part # 530071635

Carburetor

RepairClinic Item # 1995778

If the string trimmer won't start, 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 and it can be difficult to burn making it hard to start the engine. 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 - Part # 1987730 Mfg Part # 530069845

Carburetor Kit

RepairClinic Item # 1987730

If the string trimmer won't start, 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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Rewind Spring - Part # 1995844 Mfg Part # 545008011

Rewind Spring

RepairClinic Item # 1995844

When the starter rope is pulled and let go the rewind spring is supposed to recoil the rope onto a pulley. If the rewind spring is broken the rope can't be recoiled onto the string trimmer pulley which will prevent it from turning over the engine, and then it is hard to start. Many rewind springs can be replaced but it's sometimes easier to replace the whole recoil starter assembly.

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Recoil Starter Pulley - Part # 1987612 Mfg Part # 530069400

Recoil Starter Pulley

RepairClinic Item # 1987612

When the starter rope is pulled and let go the recoil spring is supposed to recoil the rope onto the recoil starter pulley. If the recoil spring is broken the rope can't be recoiled onto the pulley which will prevent it from turning over the string trimmer engine, and then it does not start. Many recoil springs can be replaced but it's sometimes easier to replace the whole recoil starter assembly.

$7.05

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Fuel Filter - Part # 1989236 Mfg Part # 530095646

Fuel Filter

RepairClinic Item # 1989236

If the string trimmer won't start the fuel filter might be clogged. The fuel filter is usually inline with the fuel line coming from the gas tank. Its purpose is to trap sediment and contaminants from the fuel. Over time it can become clogged and not let enough fuel through. It can't be cleaned but must be replaced if needed.

$2.75

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Air Filter - Part # 1985647 Mfg Part # 530047932

Air Filter

RepairClinic Item # 1985647

If the string trimmer won't start the air filter might be clogged. Remove the air filter and replace with the correct filter.

$1.25

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