Fitting a belt is tricky. It MUST be equal to the top of the rear pulley, and sit SNUGLY on the drive boss. That is the correct length. If it does NOT sit at the top of the rear pulley it is too narrow, and you need to go wider. If it is NOT snug on the drive boss you need to go shorter. Once those parameters are correct you have the right belt. Longer belts will travel higher on the Var. but you loose take off speed if it is too long. So to start with just check to see if yours is correct. Just because it came with the scoot does not mean it is the best one for performance.