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HomeRepair HelpSnapper Mower RepairSnapper Lawn mower won't start Repair
Snapper Lawn mower won't start
If your Snapper lawn mower won't start, start with the parts most likely to fail and the checks that give you a clear answer fast. The most common cause is a bad spark plug, so inspect it for a cracked porcelain insulator, burned or damaged electrode, or heavy carbon buildup, then confirm spark with a spark plug tester while the engine is cranking. If the plug checks out, a clogged carburetor is the next likely problem, especially if fuel sat in the mower too long and turned sticky inside the carburetor float bowl. In many cases, carburetor cleaner will help, but if not, you may need a carburetor repair kit or a complete carburetor replacement. Old or bad gasoline can cause the same no-start condition. After that, check the start switch for continuity with a multimeter, then inspect the fuel pump, including the pulse line, diaphragm, and check valves. Whether your Snapper lawn mower is not starting or has spark but won't start, enter your model number on RepairClinic.com to find the exact spark plug, carburetor, start switch, fuel pump, or other replacement part that fits your mower.
01 - Snapper 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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02 - Snapper 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 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.
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03 - Snapper 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 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.
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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 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.
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05 - Snapper Lawn Mower Start Switch
To determine if the start switch is defective, use a multimeter to test it for continuity.
Highly Likely
06 - Snapper 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 won't my Snapper lawn mower start?
My Snapper lawn mower has spark but won't start. What should I check next?
How do I tell if the carburetor is clogged on a Snapper lawn mower?
How do I test a Snapper lawn mower start switch?
How do I find the right spark plug, carburetor, or fuel pump for my Snapper lawn mower?
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