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Honda Lawn Mower Won't Start

The lawn mowersmall 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.

HRR216PDA

The part(s) or condition(s) listed below for the symptom Lawn mower 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 Lawn mower won't start

Cause 1Spark 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.

Parts
Spark Plug for your HondaLawn Mower
Spark Plug - Part # 1863242 Mfg Part # 7131

Small engine NGK spark plug (BPR6ES). If the engine does not start, the spark plug may be defective. The spark plug should be replaced periodically during regular maintenance.

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Cause 2Carburetor

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 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 HondaLawn Mower
Carburetor - Part # 2001633 Mfg Part # 16100-Z0L-023

Honda Carburetor (BB62W B). If the carburetor is clogged, the engine won't get enough fuel. As a result, the engine may not start or may run rough. The carburetor can often be cleaned or rebuilt, but sometimes it may need to be replaced.

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Cause 3Old 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 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.

Cause 4Flywheel Key

the flywheel key might have sheared in half. The flywheel key is a small metal piece which fits into the crankshaft and engages with the flywheel. If the lawn mower engine stops suddenly due to hitting a hard object, the flywheel key breaks in half to prevent damage to the engine. If the flywheel key is broken, the lawn mower won't start. To determine if the flywheel key is broken, remove the flywheel from the engine and inspect the flywheel key. If the flywheel key is broken, replace it.

Parts
Flywheel Key for your HondaLawn Mower
Flywheel Key - Part # 1796002 Mfg Part # 13331-357-000

Honda flywheel key. The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.

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Cause 5Ignition Coil

The ignition coil sends voltage to the spark plug while the engine is running. If the ignition coil is defective, the engine may not start. Before replacing the ignition coil, ensure that the spark plug is working properly. If you have confirmed that the spark plug is working properly, test the ignition coil with an ignition coil tester. If the ignition coil is defective, replace it.

Parts
Ignition Coil for your HondaLawn Mower
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Cause 6Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving old fuel in the lawn mower. 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 lawn mower, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your HondaLawn Mower
Fuel Filter - Part # 1796243 Mfg Part # 16910-Z4E-S21

In-line fual filter

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Cause 7Recoil Starter

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

Parts
Recoil Starter for your HondaLawn Mower
Recoil Starter - Part # 1796099 Mfg Part # 28400-Z0L-V20ZB

Honda recoil starter assembly. The recoil starter engages the drive cup on the flywheel to start the engine. If the recoil starter is defective, the engine may not start.

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