What Causes the Abnormal Noise in a Motorcycle's Small Sprocket?
3 Answers
Due to the small sprocket and the rear large sprocket not being aligned on the same parallel line, the small sprocket and the chain generate abnormal noise during rotation. Here are specific details about the motorcycle's small sprocket: 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 assembly, while the one 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 closed, 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 riding motorcycles for many years. When the small sprocket starts making noise, it's usually due to a few common issues: bearing problems where the balls inside are worn out or disassembled, causing a rattling sound when rotating; misaligned gears or a loose chain can also create clanking noises; lack of lubrication leads to metal grinding against metal, producing a harsh sound; sometimes small parts are damaged or sand gets stuck in them. These aren't minor issues—if the chain jams, it could cause the motorcycle to break down. I make it a habit to check monthly, apply some grease for maintenance, and head to the repair shop immediately if I hear anything unusual. It's better not to skimp on small expenses to avoid costly part replacements.
As someone who frequently maintains vehicles, I believe that the frequent abnormal noises from small flywheels are often related to maintenance. If you ride for a long time without oiling and lubrication, the dry friction between parts can cause squeaking; if the chain tension isn't adjusted properly, it will rattle when starting; it could also be due to bearing aging—if not replaced in time, it will produce a clattering sound. I recommend regular cleaning and oiling, which can be easily done by yourself. However, if the noise becomes loud, it's best to get a professional inspection to prevent major issues, saving both money and hassle.
