Mega Brands New Regulator Rectifiter Fits YAMAHA R1 YZFR1 1998 1999 2000 2001 Motorcycle Used On: YAMAHA R1 YZFR1 1998 1999 2000 2001 Motorcycle No assembly required and can be installed in minutes Regulate voltage stability Please check pictures/dimensions before the purchase or contact us for details All MEGA MOTOR Parts are tested rigorously