Where is the spark plug located on a underbone motorcycle?
1 Answers
The spark plug on an underbone motorcycle is installed on the side or top of the engine. In early models, spark plugs were connected to the distributor via ignition cables, but over the past decade, most car engines have been updated to feature direct connection between the ignition coil and spark plug. Spark plug working principle: The spark plug's ground electrode connects to the metal casing, which is threaded into the engine block through the cylinder head. The insulator primarily serves to isolate the metal casing from the center electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and center electrode, it ionizes the medium between the center electrode and ground electrode to generate a spark, thereby igniting the air-fuel mixture in the cylinder. Spark plug replacement interval: Under normal maintenance conditions, replacement is recommended every 40,000-60,000 kilometers. However, this may vary depending on the brand and engine type, so always refer to the owner's manual. The following standards can serve as a reference for maintenance replacement: Platinum spark plugs should be replaced at 40,000 km, standard nickel alloy spark plugs at 20,000 km, and iridium spark plugs at 60,000-80,000 km.
