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Ryobi 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.

RY29550

The 5 most common part(s) or condition(s) which contribute to the symptom String trimmer won't start 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.

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 - Part # 1951816 Mfg Part # 308054013

Carburetor

RepairClinic Item # 1951816

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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$19.95

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Rewind Spring - Part # 1954371 Mfg Part # 638033001

Rewind Spring

RepairClinic Item # 1954371

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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$2.95

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Recoil Starter - Part # 1951877 Mfg Part # 308194005

Recoil Starter

RepairClinic Item # 1951877

If the string trimmer won't start the recoil starter assembly might not be engaging with the crankshaft and turning over the engine. Remove the starter assembly to see if it is functioning properly.

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$27.40

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Recoil Starter Pulley - Part # 1953687 Mfg Part # 518501001

Recoil Starter Pulley

RepairClinic Item # 1953687

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.

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$1.55

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Air Filter - Part # 1953778 Mfg Part # 518766001

Air Filter

RepairClinic Item # 1953778

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

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$1.85

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