What Size Wrench is Needed to Replace a Motorcycle Spark Plug?

1 Answers
VanAmara
07/29/25 10:22pm
For motorcycles with 70cc and below, use a 14mm spark plug wrench. For 110cc and 125cc motorcycles, use a 16mm spark plug wrench. What is a Spark Plug: A spark plug is a crucial component of a gasoline engine's ignition system. It introduces high-voltage electricity into the combustion chamber and generates a spark by jumping the electrode gap, thereby igniting the combustible air-fuel mixture in the cylinder. Main types of spark plugs include: Standard spark plug, extended insulator spark plug, electrode spark plug, seat-type spark plug, pole-type spark plug, and surface-gap spark plug. Where is the Spark Plug Located: Spark plugs are installed on the side or top of the engine. Early spark plugs were connected to the distributor via ignition wires. Over the past decade, most car engines have been modified to connect the ignition coil directly to the spark plug.
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