Abnormal Noise from Motorcycle Sprocket?
2 Answers
Due to the misalignment between the small sprocket and the larger rear sprocket, abnormal noise occurs when the small sprocket rotates with the chain. Here are specific details about motorcycle small sprockets: 1. Location: The small sprocket on a motorcycle refers to the chain sprocket on the engine, which is mostly installed on the left side of the engine, i.e., the front small wheel in the drive sprocket system, while the larger wheel on the rear wheel is called the large sprocket. 2. Function: The small sprocket on a motorcycle helps reduce energy consumption. When the throttle is released, the rear wheel continues to move forward using the motorcycle's inertia, automatically disengaging from the sprocket on the energy-saving flywheel and the transmission system, thereby effectively reducing resistance.
I've been repairing motorcycles for years, and the issue of a noisy small sprocket is quite common. The most frequent cause is a loose chain, which clatters against the chain guard. If the chain is tight and still making noise, you need to get down and check if the sprocket teeth are worn sharp—worn-out teeth make a particularly harsh grinding sound against the chain. If you hear a metallic clicking or clunking sound when spinning the rear wheel, it's likely the bearings have failed and need immediate replacement. Another easily overlooked issue is a loose transmission nut! Just last week, I encountered a rider who had lost two small sprocket nuts, nearly causing the sprocket to fly off. I recommend adjusting the chain every 500 kilometers and applying chain lubricant twice a month. Paying attention to these details can save you a lot on repair costs.
