This system is the perfect choice when building a bike from scratch or when upgrading your weaker charging system. The alternator rotors feature fully encased sets of magnets that have no way of working loose like OEM rotors are known to do. This kit also provides enough power to run additional accessories such as lighting stereos.; Engineered to provide 30% more power than stock system at idle 54A output at 4000 rpm provides enough power to eliminate dimming lights, reduced audio performance and under-performing heated gear Maximum power output of 793 watts (based on constant voltage cold data) Includes high-performance rotor, stator, voltage regulator and all hardware for installation Replacement parts available and sold separately: Rotor 550-2558, Regulators 550-2559 and 550-2560