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$3.80
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NGK Spark Plug (BPM7Y)
$3.80
Related Articles & Videos
03:17
Troubleshooting
Top Reasons Small Engine Won't Start — Small Engine Troubleshooting
Spark Plug Customer Reviews
Common Problems Fixed by the Spark Plug
Based on customer reports and repair data, this part commonly fixes these issues:
Very Likely
Lawn mower won't start
Very Likely
Chainsaw won't start
Very Likely
Snowblower runs rough
Very Likely
Snowblower won't start
Very Likely
String trimmer won't start
Very Likely
Small engine won't start
Very Likely
Edger won't start
Very Likely
Leaf blower won't start
Very Likely
Hedge trimmer won't start
Very Likely
Pole pruner won't start
Very Likely
Small engine hard to start
Very Likely
Lawn mower starts then stalls
Very Likely
Lawn mower is hard to start
Likely
Small engine runs poorly
Likely
Lawn mower runs rough
Likely
Snowblower starts then stalls
Likely
String trimmer runs rough
Likely
Leaf blower running rough
Likely
Hedge trimmer runs rough
Likely
Edger runs rough
Likely
Pole pruner runs poorly
About the 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.
Alternative Part Number(s)
Replaces Part Number 4921
Replaces Part Number 99944500071
Replaces Part Number 15901019630