What is the weight of the original variator rollers for the Jog i?
2 Answers
The original variator rollers for the Jog i weigh 14 grams. Relevant information about variator rollers is as follows: Basic introduction to variator rollers: One of the rotating components in scooters, variator rollers (also called moving rollers, capable of radial movement) are affected by engine speed. As the speed gradually increases, the variator rollers are subjected to outward centrifugal force that overcomes the resistance of the large spring, causing them to move radially outward along the sliding groove. This increases the force pressing against the axially moving driven plate, enlarges the working radius, reduces the diameter of the driven plate, thereby changing the transmission ratio. Function of variator rollers: If the variator rollers are heavier, the vehicle's power performance during acceleration is not ideal, resulting in sluggish acceleration and longer time required to reach high speeds. However, when the rollers slide to the outer edge of the variator pulley, they generate greater inertia, causing the engine to operate at lower RPM during prolonged high-speed cruising, which improves fuel efficiency.
When I used to ride the Yamaha Jog i, the original factory variator rollers were around 13 grams. These small rollers are crucial in the transmission system, as their weight determines the acceleration feel and engine responsiveness. Lighter ones, like 11 grams, make acceleration more aggressive but may increase engine noise. Heavier ones, such as 15 grams, provide smoother acceleration and better fuel efficiency. The factory setting of 13 grams strikes a balance between comfort and efficiency for daily commuting, and most riders find it quite smooth. If your scooter feels rough or noisy, it might be due to worn rollers. It's recommended to check them every 10,000 km. Replacing them is simple—just remove the transmission cover if you're doing it yourself. Avoid arbitrary modifications, as they can shorten the scooter's lifespan and cause vibration issues.
