Compu-Fire 40 Amp 3 Phase Charging System For Harley EVO Features: 40 Amp, 3-phase charging system provides 25 amps at idle and 40 amps continuously above 2800 RPM Voltage regulator bolts on with no frame modifications Unique narrow rotor and stator combination fits both Dyna and Softail primary cases Precision balanced and vented rotor keeps the stator cooler in closed primaries to maintain maximum output under high current draw conditions Large flanged seal spacer provides maximum support for the rotor Voltage regulator output is calibrated to 14.25 volts from idle on up