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Lawn Boy Lawn Mower Won't Start

The lawn mower 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.

10685/Serial: 280000001-280999999/2008

The 8 most common part(s) or condition(s) which cause the symptom Lawn mower won't start are listed below starting with the most likely. Check or test each item and watch any available videos.

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Spark Plug - Part # 1863243 Mfg Part # 868

Spark Plug

RepairClinic Item # 1863243 Aftermarket (Non-OEM) part

If the lawn mower engine does not start the spark plug might be defective. All small engines have an ignition coil. The coil is the device that provides spark for the spark plug(s). If the coil is bad power won't get to the spark plug(s). The coil is essentially a small, induction generator. It is mounted next to the flywheel. The flywheel has one or more strong, embedded magnets. As the flywheel spins, the magnet(s) zip past the induction coil, this action of a magnet passing past a coil induces a voltage. Depending on the design of the coil and the strength of the magnets, a stronger or weaker spark can be created and delivered to the spark plug(s). Each time the flywheel spins around a spark is generated. The best way to test a spark plug is to use a spark plug tester. The spark plug should have a strong, visible spark between the electrodes when the engine is cranking. If it doesn't, replace it.

$1.90

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Carburetor - Part # 1727820 Mfg Part # 640350

Carburetor

RepairClinic Item # 1727820

If the lawn mower does not start, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the lawn mower 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, the entire carburetor may need to be replaced.

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Other Causes and Conditions

Old or Bad Gasoline

If the lawn mower does not start, the carburetor might be clogged or have old or bad fuel in the float bowl. If old or bad fuel was left in the lawn mower 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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Flywheel Key - Part # 1659178 Mfg Part # 611298

Flywheel Key

RepairClinic Item # 1659178

If the lawn mower does not start the flywheel key might have sheared in half. The flywheel key is a small metal shim which fits into a slot in the crankshaft and engages with the flywheel. If the lawn mower blade hits a rock or other solid object the sudden stoppage of the blade can cause the flywheel key to shear. The only way to know for sure if this is the problem is to remove the flywheel and inspect the flywheel key.

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Ignition Coil - Part # 1719806 Mfg Part # 34443D

Ignition Coil

RepairClinic Item # 1719806

If the lawn mower engine does not start the ignition coil might be defective. All small engines have an ignition coil. The coil is the device that provides spark for the spark plug(s). If the coil is bad, power won't get spark to the plug(s). The coil is essentially a small, induction generator. It is mounted next to the flywheel. The flywheel has one or more strong, embedded magnets. As the flywheel spins, the magnet(s) zip past the induction coil, this action of a magnet passing past a coil induces a voltage. Depending on the design of the coil and the strength of the magnets, a stronger or weaker spark can be created and delivered to the spark plug(s). Each time the flywheel spins around a spark is generated. The best way to test the ignition coil is to use a spark plug tester to see if the spark plug is getting a spark. If it is, the ignition coil is working properly.

$28.65

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Grid is 1 inch square
Recoil Starter - Part # 1659157 Mfg Part # 590739

Recoil Starter

RepairClinic Item # 1659157

When the starter rope is pulled and let go the recoil starter assembly is supposed to recoil the rope onto a pulley. If the recoil starter assembly is broken the rope can't be recoiled onto the pulley which will prevent it from turning over the engine, and then it does not start. Many recoil starter assemblies can be repaired but it's sometimes easier to replace the whole recoil starter assembly.

$44.85

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Recoil Starter - Part # 1659161 Mfg Part # 590772

Recoil Starter

RepairClinic Item # 1659161

When the starter rope is pulled and let go the recoil starter assembly is supposed to recoil the rope onto a pulley. If the recoil starter assembly is broken the rope can't be recoiled onto the pulley which will prevent it from turning over the engine, and then it does not start. Many recoil starter assemblies can be repaired but it's sometimes easier to replace the whole recoil starter assembly.

$14.85

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Picture Unavailable

Recoil Starter Pulley

RepairClinic Item # 1659149

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 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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