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Briggs & Stratton Small Engine Runs Poorly

356447/0079-G1

The part(s) or condition(s) listed below for the symptom Small engine runs poorly 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 Small engine runs poorly

Cause 1Carburetor

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine 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.

Parts
Carburetor for your Briggs & StrattonSmall Engine
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Cause 2Carburetor

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine 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.

Parts
Carburetor for your Briggs & StrattonSmall Engine
Carburetor - Part # 3187945 Mfg Part # 846109
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Cause 3Carburetor Repair Kit

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine 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.

Parts
Carburetor Repair Kit for your Briggs & StrattonSmall Engine
Carburetor Repair Kit - Part # 1611302 Mfg Part # 809021

Overhaul Kit, 16 Horizontal, Vanguard OHV V-Twin 30 CID

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Cause 4Carburetor Repair Kit

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine 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.

Parts
Carburetor Repair Kit for your Briggs & StrattonSmall Engine
Carburetor Repair Kit - Part # 1650562 Mfg Part # 842881

Overhaul Kit, 350400 Horizontal

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Cause 5Spark 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 Briggs & StrattonSmall Engine
Spark Plug - Part # 1605018 Mfg Part # 71G

Champion Spark Plug (RC12YC). The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is has fouled (if the tip of the spark plug is burnt or damaged), the engine may not start or may run rough.

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Install Help
Cause 6Spark 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 Briggs & StrattonSmall Engine
Spark Plug - Part # 1610795 Mfg Part # 496018S

Briggs & Stratton Spark Plug (RC14YC)

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Cause 7Spark 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 Briggs & StrattonSmall Engine
Spark Plug - Part # 1610953 Mfg Part # 691043

Briggs & Stratton Spark Plug (QC12YC)

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Cause 8Spark 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 Briggs & StrattonSmall Engine
Spark Plug - Part # 1646913 Mfg Part # 792015

Briggs & Stratton Spark Plug (XC92YC)

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Cause 9Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine 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 fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Briggs & StrattonSmall Engine
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Cause 10Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine 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 fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Briggs & StrattonSmall Engine
Fuel Filter - Part # 1567939 Mfg Part # 691035

Briggs and Startton in-line fuel filter with 40 micron rating and 1/4" inlet & outlet. If the engine does not start then the fuel filter may be clogged and not allowing enough fuel to enter the carburetor.

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Install Help
Cause 11Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine 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 fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Briggs & StrattonSmall Engine
Fuel Filter - Part # 1611296 Mfg Part # 808116S

Fuel filter, Vanguard V-Twins, Horizontal w/9 Quart Fuel Tank

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Cause 12Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine 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 fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Briggs & StrattonSmall Engine
Fuel Filter - Part # 1642940 Mfg Part # 691370

Fuel Strainer, For Models 190000, 235400, 245400 & V-Twin engines w/9-quart fuel

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Cause 13Fuel Filter

The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine 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 fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.

Parts
Fuel Filter for your Briggs & StrattonSmall Engine
Add to Cart