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Briggs & Stratton Small Engine Hard to Start

31C707/0603-B1

The part(s) or condition(s) listed below for the symptom Small engine hard to 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 Small engine hard to 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 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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Cause 2Spark 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 3Spark 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 4Carburetor

The engine may be getting too much fuel or not enough fuel. This is usually due to the carburetor not working properly. If the carburetor is clogged, the engine won't get enough fuel. If the carburetor choke isn't closing properly, the engine may get too much fuel.

Parts
Carburetor for your Briggs & StrattonSmall Engine
Carburetor - Part # 4449925 Mfg Part # 594593

Briggs & Stratton carburetor. 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 may sometimes need to be replaced.

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