Hello can anyone help . This is a request on behalf of a friend. He's just put a 14 tooth sprocket on the front of his Cagiva Raptor (instead of the 16 tooth ) . Now his speedo is out of whack. He tells me it has a hall efect type of sensor on the front shaft to detect the speed. If this is the case surely there's some electronic adjustment that can be made to calibrate the speedo correctly. Thanks Stuart Melbourne , Australia