YAMAHA FZ1 2001-2015 HEALTECH SPEEDOHEALER V4 Corrects "factory inaccuracy" which may be as much as 10% Programing adjusts for tire size and gearing changes Dual stored memory banks and Top Speed Memory (Ever wondered HOW FAST you were going?) Simplest device to use...programs as easy as setting an alarm clock 30 day money back guarantee, 2 year unlimited warranty, LIMITED LIFETIME WARRANTY