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HomeRepair HelpHonda RepairHonda Lawn mower starts then stalls Repair
Honda Lawn mower starts then stalls
If your Honda lawn mower starts then stalls, starts then dies, or only runs for a few seconds, the problem is usually in the fuel system. The most common cause is a clogged carburetor from old gasoline left sitting in the mower, which can leave sticky deposits that restrict fuel flow and make the engine run briefly, then shut off. Start by cleaning the carburetor with carburetor cleaner. If that does not fix the issue, a carburetor repair kit or a complete carburetor replacement may be the better repair. Another likely cause is a blocked fuel cap vent. When the fuel cap cannot vent the tank properly, a vacuum forms and fuel stops reaching the carburetor, so the mower starts and then stops. Slightly loosening the cap during testing can help confirm that. Old or bad gas can also cause a Honda lawn mower to run then shut off, especially if it has already gummed up the carburetor. If the fuel system checks out, inspect the spark plug for carbon buildup, cracks, or electrode damage, and use a spark plug tester to verify a strong spark. Enter your model number on RepairClinic.com to find the exact Honda replacement parts that fit your mower.
01 - Honda 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 - Honda 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 - Honda 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 - Honda 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 Honda lawn mower start then stall after a few seconds?
How do I tell if the fuel cap is making my Honda mower starts then dies?
Can old gas make a Honda lawn mower only run for a few seconds?
What should I check if my Honda lawn mower has spark but won't keep running?
How do I find the right carburetor, carburetor repair kit, fuel cap, or spark plug for my Honda lawn mower?
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