What is the weight of the original factory pulley weights for the Jog i125?
2 Answers
The original factory pulley weights for the Jog i125 are 7 grams, but you can opt for 9 grams to reduce vibration. Introduction to Pulley Weights: One of the rotating components in a scooter, pulley weights (also known as movable weights, capable of radial movement) are influenced by the engine's RPM. As the RPM gradually increases, the pulley weights experience outward centrifugal force, overcoming the resistance of the main spring, and move radially outward along the sliding groove. This increases the force compressing the axially moving driven plate, enlarges the working radius, and reduces the diameter of the driven plate, thereby altering the gear ratio. Heavy Pulley Weights: Due to greater centrifugal force, even with slight RPM, the weights can quickly reach the outer edge of the plate, effectively increasing the diameter of the driving plate and reducing the gear ratio. This causes the driven plate's shoes to quickly engage with the clutch bell, propelling the motorcycle forward. In other words, it enables low-RPM starts and can even increase top speed, as the heavier weights are more easily flung to the outermost edge of the pulley plate.
I've been repairing motorcycles for many years, especially common models like the Yamaha Jog i125. The weight of the factory-installed pulley weights is generally around 10 grams, typically ranging between 8-12 grams, depending on the vehicle batch. These weights are part of the CVT transmission system, and their weight directly affects the initial response and fuel efficiency—heavier weights provide a stronger start but weaker high-speed performance, while lighter weights save fuel but result in smoother acceleration. If you feel sluggish power during riding, you can open the transmission cover to check if the weights are worn, causing them to become lighter. Remember to use professional tools for measurement, as significant weight differences can affect overall performance. It's recommended to inspect the weights every 5,000 kilometers to ensure they are intact and undamaged, preventing transmission abnormalities that could lead to malfunctions. Vehicle maintenance requires attention to detail, as factory configurations are often optimized for a balanced daily use.
