Regulator Voltage Rectifier 21066-0731 Fit For Kawasaki Ninja ZX10R ZX600 Fit For Ninja ZX6R. OEM:21066-0371 21066-0731. Efficient Heat Dissipation: The motorcycle regulator rectifier quickly dissipates internal heat, ensuring reliable performance and maintaining a steady power output. Reliable Voltage Control: Delivers a steady current flow, eliminating the power swings that compromise engine reliability. Simplified upgrade: Designed for easy installation, this assembly requires no cutting or modifications for a clean swap.