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HomeRepair HelpRyobi Mower RepairRyobi Lawn mower starts then stalls Repair
Ryobi Lawn mower starts then stalls
If your Ryobi lawn mower starts then stalls, the problem is usually fuel-related, and the carburetor is the first place to look. Old gas can leave sticky deposits that clog the carburetor, so a lawn mower starts then dies or only runs for a few seconds because it is not getting steady fuel. Try cleaning the carburetor with carburetor cleaner first. If that does not fix the issue, a carburetor repair kit or a complete carburetor replacement may be needed. Another common cause is a blocked fuel cap vent. When the fuel cap cannot vent the tank, vapor lock stops fuel flow and the mower starts and then stops. Loosening the fuel cap slightly during a test run can help confirm that problem. Bad or stale gasoline can cause the same symptom and should be replaced with fresh fuel. If the fuel system checks out, inspect the spark plug for wear, carbon buildup, or damage, and test it with a spark plug tester to confirm strong spark. For the exact Ryobi part that fits your mower, enter your model number on RepairClinic.com.
01 - Ryobi Lawn Mower Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower 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 cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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02 - Ryobi Lawn Mower Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower 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 cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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03 - Ryobi Lawn Mower Fuel Cap
As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine. If loosening the fuel cap allows the engine to stay running it is likely clogged and will need to be replaced.
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04 - Old or Bad Gasoline
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower 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 cause the engine to stall. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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05 - Ryobi Lawn Mower Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
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Frequently Asked Questions
Why does my Ryobi lawn mower start then stall after a few seconds?
How do I know if the fuel cap is making my Ryobi mower starts then dies problem happen?
Can old gas make a Ryobi lawn mower only run for a few seconds?
My Ryobi lawn mower has spark but won't stay running. Should I still check the spark plug?
How do I find the right Ryobi carburetor, fuel cap, or spark plug for my mower?
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