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What noise does a bad idler pulley make?

1 Answers
McElliana
07/29/25 3:18pm
When an idler pulley fails, it can produce abnormal noises such as squeaking, rustling, or humming. The idler pulley in a car is used to change the rotation direction of the driven gear to match that of the driving gear. Additionally, the idler pulley has a certain energy storage function, which helps stabilize the system. An idler pulley refers to a gear positioned between two other gears, meshing with both. The idler pulley itself does not alter the gear ratio but meshes with both gears to change the rotation direction of the driven gear to match the driving gear. Its sole function is to change the rotation direction without affecting the gear ratio, and it can also extend the wheelbase. Also known as an intermediate gear, the number of teeth on the idler pulley does not impact the gear ratio but will influence the rotation direction of the final gear.
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What does it mean when the yellow light on an EFI motorcycle comes on?

When the yellow light on an EFI motorcycle comes on, it indicates that the engine malfunction indicator light is illuminated, signaling an issue with the engine. The specific explanation is as follows: If the yellow light on an EFI motorcycle comes on while driving, it is best for the owner to take the motorcycle to a repair shop to check the fault code and confirm the specific reason for the engine's yellow light. The reasons for the engine malfunction light coming on can be analyzed based on the systems that make up the engine: the fuel supply system, ignition system, intake system, exhaust system, and various sensor components, among others. Relevant information is introduced as follows: An EFI motorcycle is a new type of motorcycle that uses a microcomputer to control the fuel injector to supply fuel to the cylinders that need to work, based on the engine's load, while not supplying fuel to the cylinders that are not working. Compared to traditional carburetor motorcycles, EFI motorcycles are more fuel-efficient, saving more than 20% fuel compared to carburetor models of the same type. Due to the implementation of digital ignition and fuel injection functions, fuel consumption is reduced, and emissions are improved, making EFI motorcycles more environmentally friendly than carburetor models, directly meeting the Euro 11 emission standards. Additionally, they feature easy starting, with instant ignition and stable idling.
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Is a motorcycle speed of over 70 km/h considered fast?

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What Does Motorcycle Horsepower Mean?

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What is the function of motorcycle winglets?

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