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HomeRepair HelpHonda Mower RepairHonda Lawn mower is hard to start Repair
Honda Lawn mower is hard to start
If your Honda lawn mower is hard to start, the problem is usually in the fuel system, not the whole engine. The most common cause is a clogged carburetor from old gas that has turned sticky in the carburetor float bowl, which can make a Honda lawn mower difficult to start or cause a mower hard starting condition after storage. Start by checking the carburetor and cleaning it with carburetor cleaner. If that does not fix it, a carburetor repair kit or a complete carburetor replacement may be the better move. Next, inspect the primer bulb, since cracks in the rubber can let air into the fuel system and make the lawn mower take many pulls to start. Old or bad gasoline can cause the same issue, so draining stale fuel is often part of the repair. After that, check the spark plug for wear, carbon buildup, or a cracked insulator, and use a spark plug tester to confirm strong spark. If fuel delivery is still weak, the fuel pump may be failing. Enter your Honda mower model number on RepairClinic.com to find the exact replacement parts that fit your machine.
01 - Honda Lawn Mower Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the hedge 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 make the engine hard to start. 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 Lawn Mower Primer Bulb
Over time, the rubber of the primer bulb can become brittle and cracked. If the primer bulb is cracked, air will get into the fuel system and cause the engine not to run properly. If the primer bulb is cracked, replace it.
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03 - Honda Lawn Mower Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the hedge 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 make the engine hard to start. 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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04 - Old or Bad Gasoline
There may be old or bad fuel in the carburetor float bowl. 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 make the engine hard to start. 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 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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06 - Honda Lawn Mower Fuel Pump
The fuel pump has three ports: the gas in port, the gas out port, and the pulse port. The pulse port is connected to the engine crankcase by a small rubber tube. As the engine runs, air inside the crankcase alternately pressurizes and depressurizes the air in the tube. This pressurized air moves a diaphragm inside the pump and pumps the gas. If the engine oil is overfilled, oil can enter the pulse port line, preventing it from working properly. The fuel pump also has two small check valves on the input and output ports. The check valves prevent fuel from reentering the gas tank. These check valves can fail. To determine if...
Highly Likely
Frequently Asked Questions
Why is my Honda lawn mower hard to start?
My Honda lawn mower takes many pulls to start. Should I clean or replace the carburetor?
Can bad gas make a Honda push mower hard to start?
How do I know if the spark plug is causing my Honda lawn mower not to start easily?
How do I find the right Honda lawn mower part for my model?
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