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HomeRepair HelpHusqvarna Mower RepairHusqvarna Lawn mower runs rough Repair
Husqvarna Lawn mower runs rough
If your Husqvarna lawn mower runs rough, sputters, or the engine runs unevenly after starting, the carburetor is the first place to check. Old fuel often leaves behind a sticky residue that clogs small passages in the carburetor, which can cause mower engine surging and uneven operation. Start by cleaning the carburetor with carburetor cleaner. If that does not solve the problem, rebuild it with a carburetor repair kit or replace the carburetor altogether. Next, inspect the spark plug for a cracked insulator, damaged electrode, or heavy carbon buildup, and use a spark plug tester to confirm it produces a strong spark while cranking. A clogged fuel filter is another common cause of a lawn mower runs rough problem, especially if stale fuel has been sitting in the tank, so replacing the fuel filter and draining old gas may help. For the exact Husqvarna part that fits your mower, enter your model number on RepairClinic.com to match the right carburetor, spark plug, fuel filter, or other small engine parts to your specific machine.
01 - Husqvarna 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 cause the engine to run roughly. 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 - Husqvarna 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 cause the engine to run roughly. 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 - Husqvarna 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.
Highly Likely
04 - Husqvarna Lawn Mower Fuel 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 cause the engine to run roughly. If old fuel was left in the lawn mower, drain the old fuel from the fuel tank and replace the fuel filter.
Less Common
Frequently Asked Questions
Why does my Husqvarna lawn mower run rough after starting?
Can a bad spark plug make a Husqvarna mower run rough?
Will a clogged fuel filter cause my Husqvarna lawn mower to sputter or surge?
Should I clean, rebuild, or replace the carburetor on my Husqvarna mower?
How do I find the correct Husqvarna mower part for a rough-running engine?
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