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Troy-Bilt 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.

TB475SS

The 8 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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Carburetor - Part # 1830566 Mfg Part # 753-04296

Carburetor

RepairClinic Item # 1830566

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.

$45.85

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Carburetor - Part # 1832126 Mfg Part # 753-1225

Carburetor

RepairClinic Item # 1832126

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.

$43.15

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Carburetor - Part # 1840982 Mfg Part # 791-182654

Carburetor

RepairClinic Item # 1840982

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.

$73.45

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Rewind Spring - Part # 1830559 Mfg Part # 753-04286

Rewind Spring

RepairClinic Item # 1830559

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.

$13.15

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Rewind Spring - Part # 1841151 Mfg Part # 791-613102

Rewind Spring

RepairClinic Item # 1841151

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.

$12.95

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Recoil Starter Pulley - Part # 1832108 Mfg Part # 753-1199

Recoil Starter Pulley

RepairClinic Item # 1832108

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.

$12.05

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Fuel Filter - Part # 1840839 Mfg Part # 791-182353

Fuel Filter

RepairClinic Item # 1840839

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.

$5.15

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Air Filter - Part # 1840577 Mfg Part # 791-181757

Air Filter

RepairClinic Item # 1840577

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

$2.15

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