What Causes Slight Needle Fluctuation on a Motorcycle's Idle Tachometer?

1 Answers
LeCaden
07/30/25 12:34am
Motorcycle's idle tachometer needle slight fluctuation may be caused by poor contact in the tachometer coil. Purpose of the tachometer: The tachometer can be used to determine whether the vehicle is truly started. Some novice drivers often struggle to confirm successful ignition and may turn the key again, which can damage the starter motor. Working principle of the tachometer: It operates based on the centrifugal force of rotating masses and the principle of angular or proportional rotation. When the tachometer's shaft rotates, the centrifugal weights on the flyweight assembly move outward due to inertial centrifugal force, driving the needle through a transmission mechanism.
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