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Troy-Bilt String Trimmer Won't Start

The string trimmersmall 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 part(s) or condition(s) listed below for the symptom String trimmer won't start are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for String trimmer won't start

Cause 1Carburetor

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.

Parts
Carburetor for your Troy-BiltString Trimmer
Carburetor - Part # 1830566 Mfg Part # 753-04296
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Cause 2Carburetor

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.

Parts
Carburetor for your Troy-BiltString Trimmer
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Cause 3Carburetor

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.

Parts
Carburetor for your Troy-BiltString Trimmer
Carburetor - Part # 1840982 Mfg Part # 791-182654

Carb ac-2.1 w/prime

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Cause 4Rewind Spring

When the starter rope is pulled and released, the rewind spring recoils the starter rope onto the rewind pulley. If the rewind spring is broken, the rope won’t be able to recoil onto the pulley. As a result, the engine won’t start. If the rewind spring is broken, replace it. Many rewind springs can be replaced individually, but it may be easier to replace the whole recoil starter assembly.

Parts
Rewind Spring for your Troy-BiltString Trimmer
Rewind Spring - Part # 1830559 Mfg Part # 753-04286

Starter rewind spring

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Cause 5Rewind Spring

When the starter rope is pulled and released, the rewind spring recoils the starter rope onto the rewind pulley. If the rewind spring is broken, the rope won’t be able to recoil onto the pulley. As a result, the engine won’t start. If the rewind spring is broken, replace it. Many rewind springs can be replaced individually, but it may be easier to replace the whole recoil starter assembly.

Parts
Rewind Spring for your Troy-BiltString Trimmer
Rewind Spring - Part # 1841151 Mfg Part # 791-613102
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Cause 6Recoil Starter Pulley

The recoil starter pulley winds up the starter rope when the rope is not in use. If the recoil pulley is broken or stuck, it won't be able to rewind the starter rope. As a result, the engine won't start. If the recoil starter pulley is broken, replace it.

Parts
Recoil Starter Pulley for your Troy-BiltString Trimmer
Recoil Starter Pulley - Part # 1832108 Mfg Part # 753-1199
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Cause 7Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and prevent the engine from starting. If old fuel was left in the string trimmer, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Troy-BiltString Trimmer
Fuel Filter - Part # 1840839 Mfg Part # 791-182353

Two cycle engine fuel filter and line assembly. If the fuel filter is clogged, it will restrict the flow of fuel to the carburetor. As a result, the engine may not start.

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Cause 8Air Filter

The air filter may be clogged. If the air filter is clogged, the engine will get too much fuel and not enough air. As a result, the engine may not start. If the air filter is clogged, replace it.

Parts
Air Filter for your Troy-BiltString Trimmer
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