Cush Drive

There is always something to learn about the bikes. The guy has mentioned about cush drive. Out of all these years, none of the mechanics mentioned about changing it. I mentioned to one of the shop about the sprocket not running correctly, they mentioned about the cush drive, and we did not pursue it. The instructor said I really should have changed them, they are 17 years old with 70k miles on them. I have ordered them, I should be replacing them later in the course.